{"id":2386,"date":"2025-09-03T08:41:38","date_gmt":"2025-09-03T08:41:38","guid":{"rendered":"https:\/\/flj-pcb.com\/?page_id=2386"},"modified":"2025-09-26T07:23:14","modified_gmt":"2025-09-26T07:23:14","slug":"osp-pcb","status":"publish","type":"page","link":"https:\/\/flj-pcb.com\/vi\/pcb-manufacturer\/osp-pcb\/","title":{"rendered":"OSP l\u00e0 g\u00ec?"},"content":{"rendered":"
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OSP l\u00e0 m\u1ed9t l\u1edbp ho\u00e0n thi\u1ec7n b\u1ec1 m\u1eb7t cho l\u00e1 \u0111\u1ed3ng tr\u00ean b\u1ea3ng m\u1ea1ch in (PCB). N\u00f3 tu\u00e2n th\u1ee7 ch\u1ec9 th\u1ecb RoHS. N\u00f3i m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n, OSP l\u00e0 m\u1ed9t l\u1edbp m\u00e0ng h\u1eefu c\u01a1 m\u1ecfng \u0111\u01b0\u1ee3c t\u1ea1o ra tr\u00ean b\u1ec1 m\u1eb7t \u0111\u1ed3ng s\u1ea1ch, tr\u1ea7n b\u1eb1ng m\u1ed9t qu\u00e1 tr\u00ecnh h\u00f3a h\u1ecdc. L\u1edbp m\u00e0ng n\u00e0y b\u1ea3o v\u1ec7 \u0111\u1ed3ng kh\u1ecfi qu\u00e1 tr\u00ecnh oxy h\u00f3a, s\u1ed1c nhi\u1ec7t v\u00e0 \u0111\u1ed9 \u1ea9m. N\u00f3 ng\u0103n \u0111\u1ed3ng b\u1ecb r\u1ec9 s\u00e9t ho\u1eb7c sunfua h\u00f3a trong \u0111i\u1ec1u ki\u1ec7n b\u00ecnh th\u01b0\u1eddng. \u0110\u1ed3ng th\u1eddi, l\u1edbp m\u00e0ng n\u00e0y ph\u1ea3i d\u1ec5 d\u00e0ng b\u1ecb ch\u1ea5t tr\u1ee3 h\u00e0n lo\u1ea1i b\u1ecf nhanh ch\u00f3ng trong qu\u00e1 tr\u00ecnh h\u00e0n nhi\u1ec7t \u0111\u1ed9 cao. Nh\u1edd \u0111\u00f3, l\u1edbp \u0111\u1ed3ng s\u1ea1ch b\u00ean d\u01b0\u1edbi c\u00f3 th\u1ec3 k\u1ebft d\u00ednh nhanh v\u1edbi ch\u1ea5t h\u00e0n n\u00f3ng ch\u1ea3y v\u00e0 t\u1ea1o th\u00e0nh m\u1ed1i h\u00e0n ch\u1eafc ch\u1eafn.<\/p>

Khi c\u00e1c s\u1ea3n ph\u1ea9m \u0111i\u1ec7n t\u1eed ng\u00e0y c\u00e0ng tr\u1edf n\u00ean nh\u1eb9 h\u01a1n, m\u1ecfng h\u01a1n, ng\u1eafn h\u01a1n, nh\u1ecf g\u1ecdn h\u01a1n v\u00e0 \u0111a ch\u1ee9c n\u0103ng h\u01a1n, c\u00e1c b\u1ea3ng m\u1ea1ch c\u0169ng ph\u1ea3i \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u v\u1ec1 \u0111\u1ed9 ch\u00ednh x\u00e1c cao h\u01a1n, c\u1ea5u tr\u00fac m\u1ecfng h\u01a1n, nhi\u1ec1u l\u1edbp h\u01a1n v\u00e0 l\u1ed7 khoan nh\u1ecf h\u01a1n. C\u00f4ng ngh\u1ec7 h\u00e0n b\u1ec1 m\u1eb7t (SMT) \u0111\u00e3 ph\u00e1t tri\u1ec3n nhanh ch\u00f3ng. SMT s\u1eed d\u1ee5ng c\u00e1c b\u1ea3ng m\u1ea1ch m\u1ecfng c\u00f3 m\u1eadt \u0111\u1ed9 cao trong c\u00e1c thi\u1ebft b\u1ecb nh\u01b0 th\u1ebb IC, \u0111i\u1ec7n tho\u1ea1i di \u0111\u1ed9ng, m\u00e1y t\u00ednh x\u00e1ch tay v\u00e0 b\u1ed9 thu s\u00f3ng. Do \u0111\u00f3, c\u00f4ng ngh\u1ec7 l\u00e0m ph\u1eb3ng b\u1eb1ng kh\u00ed n\u00f3ng (HASL) tr\u1edf n\u00ean \u00edt ph\u00f9 h\u1ee3p h\u01a1n v\u1edbi nh\u1eefng y\u00eau c\u1ea7u n\u00e0y.<\/p>

\"\"<\/p>

\u0110\u1ed3ng th\u1eddi, ch\u1ea5t h\u00e0n Sn-Pb \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong quy tr\u00ecnh HASL kh\u00f4ng th\u00e2n thi\u1ec7n v\u1edbi m\u00f4i tr\u01b0\u1eddng. Sau khi Ch\u1ec9 th\u1ecb RoHS c\u1ee7a EU c\u00f3 hi\u1ec7u l\u1ef1c v\u00e0o ng\u00e0y 1 th\u00e1ng 7 n\u0103m 2006, ng\u00e0nh c\u00f4ng nghi\u1ec7p c\u1ea7n c\u00e1c gi\u1ea3i ph\u00e1p thay th\u1ebf kh\u00f4ng ch\u1ee9a ch\u00ec cho l\u1edbp ho\u00e0n thi\u1ec7n b\u1ec1 m\u1eb7t PCB. C\u00e1c l\u1ef1a ch\u1ecdn ph\u1ed5 bi\u1ebfn bao g\u1ed3m OSP, ENIG (m\u1ea1 niken kh\u00f4ng \u0111i\u1ec7n ph\u00e2n k\u1ebft h\u1ee3p m\u1ea1 v\u00e0ng), m\u1ea1 b\u1ea1c ng\u00e2m v\u00e0 m\u1ea1 thi\u1ebfc ng\u00e2m.<\/p>

C\u00e1c b\u01b0\u1edbc c\u1ee7a quy tr\u00ecnh OSP<\/h2>

Quy tr\u00ecnh ti\u00eau bi\u1ec3u c\u1ee7a OSP:<\/p>

  1. T\u1ea9y d\u1ea7u m\u1ee1 \u2192<\/p><\/li>

  2. R\u1eeda l\u1ea1i hai l\u1ea7n b\u1eb1ng n\u01b0\u1edbc \u2192<\/p><\/li>

  3. Kh\u1eafc vi m\u00f4 \u2192<\/p><\/li>

  4. R\u1eeda l\u1ea1i hai l\u1ea7n b\u1eb1ng n\u01b0\u1edbc \u2192<\/p><\/li>

  5. R\u1eeda axit \u2192<\/p><\/li>

  6. R\u1eeda b\u1eb1ng n\u01b0\u1edbc c\u1ea5t \u2192<\/p><\/li>

  7. T\u1ea1o m\u00e0ng v\u00e0 s\u1ea5y kh\u00f4 b\u1eb1ng kh\u00f4ng kh\u00ed \u2192<\/p><\/li>

  8. R\u1eeda b\u1eb1ng n\u01b0\u1edbc c\u1ea5t \u2192<\/p><\/li>

  9. S\u1ea5y kh\u00f4 l\u1ea7n cu\u1ed1i<\/p><\/li><\/ol>

    D\u01b0\u1edbi \u0111\u00e2y l\u00e0 th\u00f4ng tin chi ti\u1ebft v\u1ec1 c\u00e1c b\u01b0\u1edbc ch\u00ednh v\u00e0 l\u00fd do t\u1ea1i sao ch\u00fang l\u1ea1i quan tr\u1ecdng.<\/p>

    1. T\u1ea9y d\u1ea7u m\u1ee1<\/h3>

    Vi\u1ec7c t\u1ea9y d\u1ea7u m\u1ee1 hi\u1ec7u qu\u1ea3 c\u00f3 \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn ch\u1ea5t l\u01b0\u1ee3ng m\u00e0ng. N\u1ebfu qu\u00e1 tr\u00ecnh t\u1ea9y d\u1ea7u m\u1ee1 kh\u00f4ng \u0111\u1ea1t y\u00eau c\u1ea7u, \u0111\u1ed9 d\u00e0y c\u1ee7a m\u00e0ng s\u1ebd kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u. \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o qu\u00e1 tr\u00ecnh t\u1ea9y d\u1ea7u m\u1ee1 di\u1ec5n ra \u1ed5n \u0111\u1ecbnh, c\u1ea7n ki\u1ec3m so\u00e1t n\u1ed3ng \u0111\u1ed9 h\u00f3a ch\u1ea5t trong dung d\u1ecbch t\u1ea9y r\u1eeda trong ph\u1ea1m vi quy tr\u00ecnh. \u0110\u1ed3ng th\u1eddi, c\u1ea7n th\u01b0\u1eddng xuy\u00ean ki\u1ec3m tra hi\u1ec7u qu\u1ea3 t\u1ea9y d\u1ea7u m\u1ee1. N\u1ebfu hi\u1ec7u qu\u1ea3 t\u1ea9y d\u1ea7u m\u1ee1 k\u00e9m, c\u1ea7n thay dung d\u1ecbch t\u1ea9y r\u1eeda k\u1ecbp th\u1eddi.<\/p>

    2. Kh\u1eafc vi m\u00f4<\/h3>

    Qu\u00e1 tr\u00ecnh \u0103n m\u00f2n vi m\u00f4 l\u00e0m cho b\u1ec1 m\u1eb7t \u0111\u1ed3ng tr\u1edf n\u00ean h\u01a1i nh\u00e1m. \u0110i\u1ec1u n\u00e0y gi\u00fap m\u00e0ng b\u00e1m d\u00ednh t\u1ed1t h\u01a1n. \u0110\u1ed9 d\u00e0y l\u1edbp \u0103n m\u00f2n vi m\u00f4 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 h\u00ecnh th\u00e0nh m\u00e0ng. \u0110\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 d\u00e0y m\u00e0ng \u1ed5n \u0111\u1ecbnh, c\u1ea7n duy tr\u00ec \u0111\u1ed9 s\u00e2u \u0103n m\u00f2n vi m\u00f4 \u1edf m\u1ee9c \u1ed5n \u0111\u1ecbnh. Th\u00f4ng th\u01b0\u1eddng, duy tr\u00ec \u0111\u1ed9 s\u00e2u kho\u1ea3ng 1,0\u20131,5 \u03bcm l\u00e0 ph\u00f9 h\u1ee3p. B\u1ea1n c\u00f3 th\u1ec3 \u0111o t\u1ed1c \u0111\u1ed9 \u0103n m\u00f2n vi m\u00f4 tr\u01b0\u1edbc m\u1ed7i ca l\u00e0m vi\u1ec7c, sau \u0111\u00f3 \u0111i\u1ec1u ch\u1ec9nh th\u1eddi gian \u0103n m\u00f2n vi m\u00f4 d\u1ef1a tr\u00ean t\u1ed1c \u0111\u1ed9 \u0111\u00f3.<\/p>

    3. Qu\u00e1 tr\u00ecnh t\u1ea1o m\u00e0ng<\/h3>

    Tr\u01b0\u1edbc khi t\u1ea1o m\u00e0ng, h\u00e3y r\u1eeda b\u1eb1ng n\u01b0\u1edbc DI \u0111\u1ec3 tr\u00e1nh l\u00e0m \u00f4 nhi\u1ec5m dung d\u1ecbch t\u1ea1o m\u00e0ng. Sau khi t\u1ea1o m\u00e0ng, r\u1eeda l\u1ea1i b\u1eb1ng n\u01b0\u1edbc DI. Duy tr\u00ec \u0111\u1ed9 pH c\u1ee7a n\u01b0\u1edbc r\u1eeda trong kho\u1ea3ng t\u1eeb 4,0 \u0111\u1ebfn 7,0 \u0111\u1ec3 ng\u0103n l\u1edbp m\u00e0ng b\u1ecb \u00f4 nhi\u1ec5m ho\u1eb7c h\u01b0 h\u1ecfng. Vi\u1ec7c ki\u1ec3m so\u00e1t \u0111\u1ed9 d\u00e0y c\u1ee7a m\u00e0ng OSP l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t. N\u1ebfu m\u00e0ng qu\u00e1 m\u1ecfng, kh\u1ea3 n\u0103ng ch\u1ecbu s\u1ed1c nhi\u1ec7t s\u1ebd k\u00e9m. Trong qu\u00e1 tr\u00ecnh h\u00e0n l\u1ea1i, m\u00e0ng c\u00f3 th\u1ec3 kh\u00f4ng ch\u1ecbu \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 cao (kho\u1ea3ng 190\u2013200 \u00b0C). Khi \u0111\u00f3, hi\u1ec7u su\u1ea5t h\u00e0n s\u1ebd gi\u1ea3m. Tr\u00ean d\u00e2y chuy\u1ec1n l\u1eafp r\u00e1p, m\u00e0ng ph\u1ea3i d\u1ec5 h\u00f2a tan trong ch\u1ea5t tr\u1ee3 h\u00e0n. N\u1ebfu kh\u00f4ng, qu\u00e1 tr\u00ecnh h\u00e0n s\u1ebd b\u1ecb \u1ea3nh h\u01b0\u1edfng. \u0110\u1ed9 d\u00e0y m\u00e0ng m\u1ee5c ti\u00eau th\u00f4ng th\u01b0\u1eddng l\u00e0 0,2\u20130,5 \u03bcm.<\/p>

    Ghi ch\u00fa v\u1ec1 phim OSP<\/h3>

    L\u1edbp m\u00e0ng OSP r\u1ea5t m\u1ecfng v\u00e0 d\u1ec5 b\u1ecb tr\u1ea7y x\u01b0\u1edbc ho\u1eb7c bong tr\u00f3c. C\u1ea7n x\u1eed l\u00fd c\u00e1c b\u1ea3ng m\u1ea1ch c\u1ea9n th\u1eadn trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t v\u00e0 v\u1eadn chuy\u1ec3n. Ngo\u00e0i ra, sau nhi\u1ec1u chu k\u1ef3 h\u00e0n \u1edf nhi\u1ec7t \u0111\u1ed9 cao, l\u1edbp m\u00e0ng OSP tr\u00ean c\u00e1c \u0111i\u1ec3m h\u00e0n ch\u01b0a s\u1eed d\u1ee5ng c\u00f3 th\u1ec3 b\u1ecb \u0111\u1ed5i m\u00e0u ho\u1eb7c n\u1ee9t n\u1ebb. \u0110i\u1ec1u n\u00e0y \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng h\u00e0n v\u00e0 \u0111\u1ed9 tin c\u1eady.<\/p>

    Y\u00eau c\u1ea7u s\u1ea3n xu\u1ea5t PCB \u0111\u1ed1i v\u1edbi l\u1edbp ho\u00e0n thi\u1ec7n b\u1ec1 m\u1eb7t OSP<\/h2>

    D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c quy t\u1eafc s\u1ea3n xu\u1ea5t v\u00e0 x\u1eed l\u00fd nh\u1eb1m \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 tin c\u1eady c\u1ee7a c\u00e1c bo m\u1ea1ch OSP.<\/p>

    A. C\u00e1c quy \u0111\u1ecbnh chung v\u1ec1 s\u1ea3n xu\u1ea5t v\u00e0 b\u1ea3o qu\u1ea3n<\/h3>

    1. C\u00e1c b\u1ea3ng m\u1ea1ch in (PCB) c\u00f3 l\u1edbp ph\u1ee7 OSP ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u00f3ng g\u00f3i ch\u00e2n kh\u00f4ng. H\u00e3y k\u00e8m theo ch\u1ea5t h\u00fat \u1ea9m v\u00e0 th\u1ebb ch\u1ec9 th\u1ecb \u0111\u1ed9 \u1ea9m. Trong qu\u00e1 tr\u00ecnh v\u1eadn chuy\u1ec3n v\u00e0 b\u1ea3o qu\u1ea3n, h\u00e3y \u0111\u1eb7t gi\u1ea5y c\u00e1ch ly gi\u1eefa c\u00e1c b\u1ea3ng m\u1ea1ch \u0111\u1ec3 tr\u00e1nh h\u01b0 h\u1ecfng do ma s\u00e1t \u0111\u1ed1i v\u1edbi l\u1edbp ph\u1ee7 OSP.<\/p><\/li>

    2. Kh\u00f4ng \u0111\u1ec3 c\u00e1c t\u1ea5m v\u00e1n ti\u1ebfp x\u00fac tr\u1ef1c ti\u1ebfp v\u1edbi \u00e1nh n\u1eafng m\u1eb7t tr\u1eddi. Duy tr\u00ec m\u00f4i tr\u01b0\u1eddng kho b\u00e3i th\u00edch h\u1ee3p. \u0110\u1ed9 \u1ea9m t\u01b0\u01a1ng \u0111\u1ed1i (RH): 30\u201370%. Nhi\u1ec7t \u0111\u1ed9: 15\u201330 \u00b0C. Th\u1eddi gian b\u1ea3o qu\u1ea3n kh\u00f4ng n\u00ean qu\u00e1 6 th\u00e1ng.<\/p><\/li>

    3. Khi m\u1edf bao b\u00ec b\u1ea3ng m\u1ea1ch t\u1ea1i tr\u1ea1m SMT, h\u00e3y ki\u1ec3m tra bao b\u00ec ch\u00e2n kh\u00f4ng, ch\u1ea5t h\u00fat \u1ea9m v\u00e0 th\u1ebb \u0111o \u0111\u1ed9 \u1ea9m. N\u1ebfu c\u00e1c y\u1ebfu t\u1ed1 n\u00e0y kh\u00f4ng \u0111\u1ea1t y\u00eau c\u1ea7u, h\u00e3y tr\u1ea3 l\u1ea1i b\u1ea3ng m\u1ea1ch cho nh\u00e0 s\u1ea3n xu\u1ea5t PCB \u0111\u1ec3 x\u1eed l\u00fd l\u1ea1i tr\u01b0\u1edbc khi s\u1eed d\u1ee5ng. \u0110\u01b0a b\u1ea3ng m\u1ea1ch v\u00e0o d\u00e2y chuy\u1ec1n s\u1ea3n xu\u1ea5t trong v\u00f2ng 8 gi\u1edd sau khi m\u1edf bao b\u00ec. Kh\u00f4ng n\u00ean m\u1edf nhi\u1ec1u g\u00f3i c\u00f9ng m\u1ed9t l\u00fac. Tu\u00e2n th\u1ee7 nguy\u00ean t\u1eafc \u201cm\u1edf khi c\u1ea7n, s\u1ea3n xu\u1ea5t khi c\u1ea7n\u201d. Vi\u1ec7c \u0111\u1ec3 b\u1ea3ng m\u1ea1ch ti\u1ebfp x\u00fac v\u1edbi kh\u00f4ng kh\u00ed qu\u00e1 l\u00e2u s\u1ebd g\u00e2y ra l\u1ed7i h\u00e0n theo l\u00f4.<\/p><\/li>

    4. Sau khi in khu\u00f4n, h\u00e3y nhanh ch\u00f3ng \u0111\u01b0a c\u00e1c b\u1ea3ng m\u1ea1ch v\u00e0o l\u00f2 n\u01b0\u1edbng. Kh\u00f4ng \u0111\u1ec3 ch\u00fang n\u1eb1m y\u00ean. Th\u1eddi gian ch\u1edd t\u1ed1i \u0111a l\u00e0 1 gi\u1edd. Ch\u1ea5t tr\u1ee3 h\u00e0n trong b\u1ed9t h\u00e0n c\u00f3 th\u1ec3 g\u00e2y \u0103n m\u00f2n m\u1ea1nh l\u1edbp m\u00e0ng OSP.<\/p><\/li>

    5. Duy tr\u00ec m\u00f4i tr\u01b0\u1eddng x\u01b0\u1edfng \u1ed5n \u0111\u1ecbnh. \u0110\u1ed9 \u1ea9m t\u01b0\u01a1ng \u0111\u1ed1i 40\u201360%. Nhi\u1ec7t \u0111\u1ed9 18\u201327 \u00b0C.<\/p><\/li>

    6. Trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t, tr\u00e1nh ch\u1ea1m tay tr\u1ea7n v\u00e0o b\u1ec1 m\u1eb7t b\u1ea3ng m\u1ea1ch in. M\u1ed3 h\u00f4i v\u00e0 d\u1ea7u tr\u00ean da c\u00f3 th\u1ec3 g\u00e2y ra qu\u00e1 tr\u00ecnh oxy h\u00f3a.<\/p><\/li>

    7. N\u1ebfu b\u1ea1n th\u1ef1c hi\u1ec7n l\u1eafp r\u00e1p SMT m\u1ed9t m\u1eb7t tr\u01b0\u1edbc, h\u00e3y ho\u00e0n th\u00e0nh vi\u1ec7c l\u1eafp r\u00e1p SMT m\u1eb7t c\u00f2n l\u1ea1i trong v\u00f2ng 12 gi\u1edd.<\/p><\/li>

    8. Sau khi ho\u00e0n th\u00e0nh c\u00f4ng \u0111o\u1ea1n SMT, h\u00e3y ti\u1ebfn h\u00e0nh l\u1eafp r\u00e1p DIP c\u00e0ng nhanh c\u00e0ng t\u1ed1t, ch\u1eadm nh\u1ea5t l\u00e0 trong v\u00f2ng 24 gi\u1edd.<\/p><\/li>

    9. Kh\u00f4ng n\u00ean nung c\u00e1c t\u1ea5m OSP c\u00f2n \u1ea9m. Vi\u1ec7c nung \u1edf nhi\u1ec7t \u0111\u1ed9 cao c\u00f3 th\u1ec3 l\u00e0m bi\u1ebfn m\u00e0u ho\u1eb7c l\u00e0m h\u1ecfng t\u1ea5m OSP.<\/p><\/li>

    10. C\u00e1c b\u1ea3ng m\u1ea1ch ch\u01b0a s\u1eed d\u1ee5ng \u0111\u00e3 qu\u00e1 h\u1ea1n, b\u1ecb \u1ea9m ho\u1eb7c \u0111\u00e3 \u0111\u01b0\u1ee3c l\u00e0m s\u1ea1ch sau khi ph\u00e1t hi\u1ec7n l\u1ed7i in c\u1ea7n \u0111\u01b0\u1ee3c tr\u1ea3 l\u1ea1i cho nh\u00e0 s\u1ea3n xu\u1ea5t b\u1ea3ng m\u1ea1ch \u0111\u1ec3 ti\u1ebfn h\u00e0nh s\u1eeda ch\u1eefa b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p OSP. Kh\u00f4ng \u0111\u01b0\u1ee3c s\u1eeda ch\u1eefa c\u00f9ng m\u1ed9t b\u1ea3ng m\u1ea1ch b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p OSP qu\u00e1 ba l\u1ea7n. Sau ba l\u1ea7n s\u1eeda ch\u1eefa, h\u00e3y lo\u1ea1i b\u1ecf b\u1ea3ng m\u1ea1ch \u0111\u00f3.<\/p><\/li><\/ol>

      B. C\u00e1c quy t\u1eafc thi\u1ebft k\u1ebf khu\u00f4n SMT cho b\u1ea3ng m\u1ea1ch OSP<\/h3>

      1. B\u1ea3ng m\u1ea1ch OSP c\u00f3 b\u1ec1 m\u1eb7t ph\u1eb3ng. \u0110i\u1ec1u n\u00e0y gi\u00fap \u0111\u1ecbnh h\u00ecnh l\u1edbp keo h\u00e0n. Tuy nhi\u00ean, c\u00e1c \u0111i\u1ec3m ti\u1ebfp x\u00fac OSP kh\u00f4ng th\u1ec3 cung c\u1ea5p th\u00eam l\u01b0\u1ee3ng h\u00e0n nh\u01b0 HASL. Do \u0111\u00f3, h\u00e3y m\u1edf r\u1ed9ng c\u00e1c l\u1ed7 tr\u00ean khu\u00f4n in m\u1ed9t ch\u00fat. \u0110i\u1ec1u n\u00e0y gi\u00fap \u0111\u1ea3m b\u1ea3o h\u00e0n ph\u1ee7 k\u00edn to\u00e0n b\u1ed9 \u0111i\u1ec3m ti\u1ebfp x\u00fac. Khi chuy\u1ec3n \u0111\u1ed5i t\u1eeb HASL sang OSP, c\u1ea7n thi\u1ebft k\u1ebf l\u1ea1i khu\u00f4n in.<\/p><\/li>

      2. Sau khi m\u1edf r\u1ed9ng kh\u1ea9u \u0111\u1ed9, h\u00e3y x\u1eed l\u00fd c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng nh\u01b0 h\u00ecnh th\u00e0nh h\u1ea1t h\u00e0n, hi\u1ec7n t\u01b0\u1ee3ng \u201ctombstoning\u201d v\u00e0 \u0111\u1ed3ng l\u1ed9 ra b\u1eb1ng c\u00e1ch thay \u0111\u1ed5i h\u00ecnh d\u1ea1ng l\u1ed7 khu\u00f4n th\u00e0nh thi\u1ebft k\u1ebf \u201cl\u00f5m\u201d. \u0110i\u1ec1u n\u00e0y gi\u00fap ng\u0103n ng\u1eeba s\u1ef1 h\u00ecnh th\u00e0nh h\u1ea1t h\u00e0n.<\/p><\/li>

      3. N\u1ebfu vi\u1ec7c l\u1eafp \u0111\u1eb7t linh ki\u1ec7n kh\u00f4ng th\u00e0nh c\u00f4ng v\u00e0 linh ki\u1ec7n \u0111\u00f3 b\u1ecb thi\u1ebfu, h\u00e3y \u0111\u1ea3m b\u1ea3o r\u1eb1ng b\u1ed9t h\u00e0n v\u1eabn ph\u1ee7 l\u00ean mi\u1ebfng h\u00e0n c\u00e0ng nhi\u1ec1u c\u00e0ng t\u1ed1t.<\/p><\/li>

      4. \u0110\u1ec3 tr\u00e1nh hi\u1ec7n t\u01b0\u1ee3ng oxy h\u00f3a \u0111\u1ed3ng l\u1ed9 ra ngo\u00e0i v\u00e0 c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 \u0111\u1ed9 tin c\u1eady, h\u00e3y c\u00e2n nh\u1eafc vi\u1ec7c in keo h\u00e0n l\u00ean c\u00e1c \u0111i\u1ec3m ki\u1ec3m tra ICT, l\u1ed7 v\u00edt l\u1eafp r\u00e1p v\u00e0 c\u00e1c \u0111i\u1ec3m via l\u1ed9 ra ngo\u00e0i (m\u1eb7t sau c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c h\u00e0n s\u00f3ng). \u0110\u1ea3m b\u1ea3o \u0111\u01b0a c\u00e1c l\u1ed7 n\u00e0y v\u00e0o thi\u1ebft k\u1ebf khu\u00f4n in.<\/p><\/li><\/ol>

        C. X\u1eed l\u00fd c\u00e1c b\u1ea3ng m\u1ea1ch c\u00f3 l\u1edbp m\u1ef1c h\u00e0n in kh\u00f4ng \u0111\u1ea1t ti\u00eau chu\u1ea9n<\/h3>

        1. H\u00e3y c\u1ed1 g\u1eafng tr\u00e1nh c\u00e1c l\u1ed7i in. Vi\u1ec7c l\u00e0m s\u1ea1ch s\u1ebd l\u00e0m h\u1ecfng l\u1edbp OSP.<\/p><\/li>

        2. N\u1ebfu b\u1ea3ng m\u1ea1ch c\u00f3 ch\u1ea5t l\u01b0\u1ee3ng in keo h\u00e0n k\u00e9m, kh\u00f4ng \u0111\u01b0\u1ee3c ng\u00e2m ho\u1eb7c r\u1eeda b\u1ea3ng m\u1ea1ch OSP b\u1eb1ng c\u00e1c dung m\u00f4i c\u00f3 \u0111\u1ed9 bay h\u01a1i cao. Do l\u1edbp m\u00e0ng OSP d\u1ec5 b\u1ecb dung m\u00f4i h\u1eefu c\u01a1 l\u00e0m m\u00f2n, h\u00e3y d\u00f9ng v\u1ea3i kh\u00f4ng d\u1ec7t th\u1ea5m c\u1ed3n 75% \u0111\u1ec3 lau s\u1ea1ch keo h\u00e0n. Sau \u0111\u00f3, d\u00f9ng m\u00e1y th\u1ed5i kh\u00ed \u0111\u1ec3 l\u00e0m kh\u00f4. Kh\u00f4ng \u0111\u01b0\u1ee3c d\u00f9ng c\u1ed3n isopropyl (IPA) \u0111\u1ec3 l\u00e0m s\u1ea1ch. Kh\u00f4ng \u0111\u01b0\u1ee3c d\u00f9ng dao c\u1ea1o \u0111\u1ec3 lo\u1ea1i b\u1ecf keo h\u00e0n.<\/p><\/li>

        3. Sau khi kh\u1eafc ph\u1ee5c l\u1ed7i in, h\u00e3y ho\u00e0n t\u1ea5t c\u00f4ng vi\u1ec7c l\u1eafp r\u00e1p SMT tr\u00ean m\u1eb7t \u0111\u00f3 trong v\u00f2ng 1 gi\u1edd.<\/p><\/li>

        4. \u0110\u1ed1i v\u1edbi c\u00e1c l\u00f4 s\u1ea3n ph\u1ea9m c\u00f3 l\u1ed7i in \u1ea5n v\u1edbi s\u1ed1 l\u01b0\u1ee3ng l\u1edbn (v\u00ed d\u1ee5: t\u1eeb 20 chi\u1ebfc tr\u1edf l\u00ean), h\u00e3y g\u1eedi tr\u1ea3 l\u1ea1i cho nh\u00e0 s\u1ea3n xu\u1ea5t PCB \u0111\u1ec3 ti\u1ebfn h\u00e0nh s\u1eeda ch\u1eefa t\u1eadp trung.<\/p><\/li><\/ol>

          C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a OSP trong qu\u00e1 tr\u00ecnh l\u1eafp r\u00e1p SMT l\u00e0 g\u00ec?<\/h2>

          B\u1ea3ng m\u1ea1ch OSP \u0111\u00f2i h\u1ecfi c\u00e1c quy tr\u00ecnh b\u1ea3o qu\u1ea3n v\u00e0 x\u1eed l\u00fd nghi\u00eam ng\u1eb7t. T\u1eeb th\u1eddi \u0111i\u1ec3m m\u1edf g\u00f3i ch\u00e2n kh\u00f4ng cho \u0111\u1ebfn l\u1ea7n h\u00e0n n\u00f3ng \u0111\u1ea7u ti\u00ean ho\u1eb7c sau l\u1ea7n h\u00e0n n\u00f3ng \u0111\u1ea7u ti\u00ean, th\u1eddi gian l\u01b0u tr\u1eef ph\u1ea3i \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t ch\u1eb7t ch\u1ebd. N\u1ebfu kh\u00f4ng, ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a l\u1ea7n h\u00e0n n\u00f3ng th\u1ee9 hai s\u1ebd b\u1ecb \u1ea3nh h\u01b0\u1edfng. Sau m\u1ed9t chu k\u1ef3 h\u00e0n n\u00f3ng, l\u1edbp m\u00e0ng b\u1ea3o v\u1ec7 h\u1eefu c\u01a1 tr\u00ean b\u1ec1 m\u1eb7t PCB th\u01b0\u1eddng b\u1ecb ph\u00e1 h\u1ee7y v\u00e0 b\u1ea3ng m\u1ea1ch m\u1ea5t kh\u1ea3 n\u0103ng ch\u1ed1ng oxy h\u00f3a. Do \u0111\u00f3, vi\u1ec7c h\u00e0n n\u00f3ng l\u1ea7n th\u1ee9 hai s\u1ebd kh\u00f3 kh\u0103n h\u01a1n. Ngo\u00e0i ra, b\u1ec1 m\u1eb7t OSP c\u00f3 xu h\u01b0\u1edbng l\u00e0m \u01b0\u1edbt b\u1ed9t h\u00e0n k\u00e9m h\u01a1n so v\u1edbi m\u1ed9t s\u1ed1 lo\u1ea1i b\u1ec1 m\u1eb7t kh\u00e1c. C\u00e1c m\u1ed1i h\u00e0n c\u00f3 th\u1ec3 l\u00e0m l\u1ed9 \u0111\u1ed3ng v\u00e0 \u0111\u1ed9 tin c\u1eady c\u00f3 th\u1ec3 gi\u1ea3m. H\u00ecnh th\u1ee9c c\u1ee7a m\u1ed1i h\u00e0n c\u00f3 th\u1ec3 kh\u00f4ng d\u1ec5 d\u00e0ng \u0111\u00e1p \u1ee9ng ti\u00eau chu\u1ea9n IPC Class 3. Nhi\u1ec1u s\u1ea3n ph\u1ea9m s\u1eed d\u1ee5ng pin-in-paste (PIP) kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi OSP.<\/p>

          Tuy nhi\u00ean, c\u00e1c t\u1ea5m v\u00e1n OSP c\u00f3 b\u1ec1 m\u1eb7t ph\u1eb3ng v\u00e0 \u0111\u1ed3ng nh\u1ea5t. Quy tr\u00ecnh s\u1ea3n xu\u1ea5t v\u00e1n \u1ed5n \u0111\u1ecbnh v\u00e0 chi ph\u00ed th\u1ea5p. So v\u1edbi c\u00e1c lo\u1ea1i kh\u00e1c, OSP c\u00f3 nh\u1eefng \u01b0u \u0111i\u1ec3m r\u00f5 r\u1ec7t. V\u00ec v\u1eady, r\u1ea5t nhi\u1ec1u c\u00f4ng ty v\u1eabn \u01b0a chu\u1ed9ng b\u1ec1 m\u1eb7t ho\u00e0n thi\u1ec7n OSP.<\/p>

          \u01afu \u0111i\u1ec3m c\u1ee7a quy tr\u00ecnh OSP<\/h2>

          1. Chi ph\u00ed l\u1eafp r\u00e1p SMT th\u1ea5p.<\/p><\/li>

          2. \u0110\u1ed9 b\u1ec1n m\u1ed1i h\u00e0n cao.<\/p><\/li>

          3. C\u00f3 kh\u1ea3 n\u0103ng h\u00e0n t\u1ed1t n\u1ebfu \u0111\u01b0\u1ee3c x\u1eed l\u00fd \u0111\u00fang c\u00e1ch.<\/p><\/li>

          4. B\u1ec1 m\u1eb7t ph\u1eb3ng th\u00edch h\u1ee3p cho thi\u1ebft k\u1ebf mi\u1ebfng \u0111\u1ec7m m\u1eadt \u0111\u1ed9 cao.<\/p><\/li>

          5. T\u01b0\u01a1ng th\u00edch v\u1edbi c\u00e1c b\u1ec1 m\u1eb7t ho\u00e0n thi\u1ec7n h\u1ed7n h\u1ee3p (v\u00ed d\u1ee5: m\u1ea1 ENIG c\u00f3 ch\u1ecdn l\u1ecdc).<\/p><\/li>

          6. D\u1ec5 d\u00e0ng ch\u1ec9nh s\u1eeda l\u1ea1i.<\/p><\/li><\/ol>

            \"Six-layer<\/p>

            Nh\u1eefng nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a quy tr\u00ecnh OSP<\/h2>

            1. \u0110i\u1ec7n tr\u1edf ti\u1ebfp x\u00fac cao h\u01a1n. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn qu\u00e1 tr\u00ecnh ki\u1ec3m tra \u0111i\u1ec7n.<\/p><\/li>

            2. Kh\u00f4ng th\u00edch h\u1ee3p \u0111\u1ec3 h\u00e0n l\u1ed7 xuy\u00ean qua theo ph\u01b0\u01a1ng ph\u00e1p h\u00e0n h\u00e0ng.<\/p><\/li>

            3. \u0110\u1ed9 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t v\u00e0 \u0111\u1ed9 b\u1ec1n quy tr\u00ecnh k\u00e9m. Sau m\u1ed9t l\u1ea7n h\u00e0n l\u1ea1i \u1edf nhi\u1ec7t \u0111\u1ed9 cao, l\u1edbp b\u1ea3o v\u1ec7 ch\u1ed1ng oxy h\u00f3a th\u01b0\u1eddng kh\u00f4ng c\u00f2n hi\u1ec7u l\u1ef1c. Kho\u1ea3ng th\u1eddi gian th\u1ef1c hi\u1ec7n quy tr\u00ecnh r\u1ea5t ng\u1eafn. T\u1ea5t c\u1ea3 c\u00e1c c\u00f4ng \u0111o\u1ea1n SMT sau l\u1ea7n h\u00e0n \u0111\u1ea7u ti\u00ean ph\u1ea3i \u0111\u01b0\u1ee3c ho\u00e0n th\u00e0nh trong v\u00f2ng 24 gi\u1edd.<\/p><\/li>

            4. Kh\u00f4ng ch\u1ed1ng \u0103n m\u00f2n.<\/p><\/li>

            5. Y\u00eau c\u1ea7u cao v\u1ec1 \u0111\u1ed9 ch\u00ednh x\u00e1c khi in. Vi\u1ec7c l\u00e0m s\u1ea1ch s\u1ebd l\u00e0m h\u1ecfng m\u00e0ng OSP (c\u00e1c ch\u1ea5t c\u1ed3n v\u00e0 axit c\u00f3 th\u1ec3 l\u00e0m suy gi\u1ea3m ch\u1ea5t l\u01b0\u1ee3ng m\u00e0ng OSP).<\/p><\/li>

            6. Hi\u1ec7u su\u1ea5t h\u00e0n xuy\u00ean k\u00e9m \u0111\u1ed1i v\u1edbi c\u00e1c l\u1ed7 h\u00e0n s\u00f3ng.<\/p><\/li><\/ol>

              Nh\u1eefng l\u1eddi khuy\u00ean thi\u1ebft th\u1ef1c khi s\u1eed d\u1ee5ng b\u1ea3ng m\u1ea1ch OSP tr\u00ean d\u00e2y chuy\u1ec1n l\u1eafp r\u00e1p<\/h2>

              • Lu\u00f4n mua c\u00e1c t\u1ea5m OSP \u0111\u01b0\u1ee3c \u0111\u00f3ng g\u00f3i ch\u00e2n kh\u00f4ng k\u00e8m ch\u1ea5t h\u00fat \u1ea9m v\u00e0 th\u1ebb \u0111o \u0111\u1ed9 \u1ea9m. Ch\u1ec9 m\u1edf m\u1ed9t g\u00f3i m\u1ed7i l\u1ea7n. S\u1eed d\u1ee5ng c\u00e1c t\u1ea5m n\u00e0y ngay sau khi m\u1edf.<\/p><\/li>

              • Tr\u00e1nh ch\u1ea1m v\u00e0o c\u00e1c mi\u1ebfng \u0111\u1ec7m h\u1edf. H\u00e3y \u0111eo g\u0103ng tay ho\u1eb7c d\u00f9ng nh\u00edp khi c\u1ea7n thi\u1ebft.<\/p><\/li>

              • Duy tr\u00ec m\u00f4i tr\u01b0\u1eddng l\u1eafp r\u00e1p \u1ed5n \u0111\u1ecbnh: RH 40\u201360%, nhi\u1ec7t \u0111\u1ed9 18\u201327 \u00b0C.<\/p><\/li>

              • Kh\u00f4ng \u0111\u1ec3 c\u00e1c b\u1ea3ng m\u1ea1ch \u0111\u00e3 in qu\u00e1 m\u1ed9t gi\u1edd tr\u01b0\u1edbc khi ti\u1ebfn h\u00e0nh h\u00e0n l\u1ea1i.<\/p><\/li>

              • H\u00e3y \u0111\u1ea3m b\u1ea3o kho\u1ea3ng th\u1eddi gian gi\u1eefa l\u1ea7n nung ch\u1ea3y \u0111\u1ea7u ti\u00ean v\u00e0 c\u00e1c b\u01b0\u1edbc ti\u1ebfp theo trong quy tr\u00ecnh \u0111\u01b0\u1ee3c gi\u1eef \u1edf m\u1ee9c ng\u1eafn nh\u1ea5t c\u00f3 th\u1ec3. N\u00ean ho\u00e0n t\u1ea5t to\u00e0n b\u1ed9 quy tr\u00ecnh l\u1eafp r\u00e1p b\u1ec1 m\u1eb7t (SMT) trong v\u00f2ng 24 gi\u1edd sau l\u1ea7n nung ch\u1ea3y \u0111\u1ea7u ti\u00ean. N\u1ebfu kh\u00f4ng th\u1ec3 tr\u00e1nh kh\u1ecfi vi\u1ec7c ph\u1ea3i tr\u00ec ho\u00e3n, h\u00e3y b\u1ea3o qu\u1ea3n c\u00e1c b\u1ea3ng m\u1ea1ch \u0111\u00e3 qua nung ch\u1ea3y trong t\u1ee7 s\u1ea5y kh\u00f4 v\u00e0 tu\u00e2n th\u1ee7 h\u01b0\u1edbng d\u1eabn c\u1ee7a nh\u00e0 cung c\u1ea5p PCB.<\/p><\/li>

              • N\u1ebfu c\u1ea7n l\u00e0m s\u1ea1ch c\u00e1c v\u1ebft b\u1ea9n do keo d\u00e1n, h\u00e3y d\u00f9ng c\u1ed3n 75% th\u1ea5m v\u00e0o m\u1ed9t mi\u1ebfng v\u1ea3i kh\u00f4ng d\u1ec7t. Lau nh\u1eb9 nh\u00e0ng. \u0110\u1ec3 kh\u00f4 t\u1ef1 nhi\u00ean. Kh\u00f4ng ng\u00e2m. Kh\u00f4ng d\u00f9ng IPA ho\u1eb7c c\u00e1c dung m\u00f4i m\u1ea1nh. Kh\u00f4ng c\u1ea1o b\u1eb1ng dao.<\/p><\/li>

              • Thi\u1ebft k\u1ebf khu\u00f4n c\u00f3 l\u1ed7 m\u1edf r\u1ed9ng h\u01a1n m\u1ed9t ch\u00fat cho c\u00e1c \u0111i\u1ec3m ti\u1ebfp x\u00fac OSP. C\u00e2n nh\u1eafc s\u1eed d\u1ee5ng h\u00ecnh d\u1ea1ng l\u1ed7 m\u1edf l\u00f5m \u0111\u1ec3 gi\u1ea3m thi\u1ec3u c\u00e1c v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn h\u1ea1t h\u00e0n.<\/p><\/li>

              • \u0110\u1ed1i v\u1edbi c\u00e1c \u0111i\u1ec3m ki\u1ec3m tra v\u00e0 l\u1ed7 v\u00edt h\u1edf, h\u00e3y c\u00e2n nh\u1eafc in keo h\u00e0n \u0111\u1ec3 b\u1ea3o v\u1ec7 l\u1edbp \u0111\u1ed3ng n\u1ebfu thi\u1ebft k\u1ebf cho ph\u00e9p.<\/p><\/li><\/ul>

                Khi n\u00e0o n\u00ean ch\u1ecdn OSP<\/h2>

                H\u00e3y ch\u1ecdn OSP khi:<\/p>

                • B\u1ea1n c\u1ea7n m\u1ed9t gi\u1ea3i ph\u00e1p ho\u00e0n thi\u1ec7n chi ph\u00ed th\u1ea5p cho c\u00e1c b\u1ea3ng m\u1ea1ch SMT m\u1eadt \u0111\u1ed9 cao.<\/p><\/li>

                • B\u1ea1n c\u1ea7n m\u1ed9t b\u1ec1 m\u1eb7t ph\u1eb3ng \u0111\u1ec3 l\u1eafp c\u00e1c linh ki\u1ec7n c\u00f3 kho\u1ea3ng c\u00e1ch ch\u00e2n nh\u1ecf.<\/p><\/li>

                • Quy tr\u00ecnh l\u1eafp r\u00e1p c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 ki\u1ec3m so\u00e1t ch\u1eb7t ch\u1ebd vi\u1ec7c l\u01b0u tr\u1eef v\u00e0 th\u1eddi gian.<\/p><\/li>

                • Qu\u00fd v\u1ecb ch\u1ea5p nh\u1eadn c\u00e1c gi\u1edbi h\u1ea1n v\u1ec1 chu k\u1ef3 nhi\u1ec7t v\u00e0 h\u00e0n s\u00f3ng.<\/p><\/li><\/ul>

                  Kh\u00f4ng n\u00ean ch\u1ecdn OSP trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p sau:<\/p>

                  • B\u1ea1n c\u1ea7n th\u1ef1c hi\u1ec7n nhi\u1ec1u chu k\u1ef3 nhi\u1ec7t \u0111\u1ed9 cao ho\u1eb7c nhi\u1ec1u b\u01b0\u1edbc h\u00e0n s\u00f3ng.<\/p><\/li>

                  • B\u1ea1n c\u1ea7n th\u1eddi h\u1ea1n s\u1eed d\u1ee5ng l\u00e2u d\u00e0i cho c\u00e1c mi\u1ebfng \u0111\u1ec7m ti\u1ebfp x\u00fac tr\u1ef1c ti\u1ebfp v\u1edbi m\u00f4i tr\u01b0\u1eddng b\u00ean ngo\u00e0i m\u00e0 kh\u00f4ng c\u00f3 l\u1edbp b\u1ea3o v\u1ec7.<\/p><\/li>

                  • S\u1ea3n ph\u1ea9m c\u1ee7a qu\u00fd v\u1ecb ph\u1ea3i \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u nghi\u00eam ng\u1eb7t v\u1ec1 ki\u1ec3m tra ngo\u1ea1i quan ho\u1eb7c kh\u1ea3 n\u0103ng h\u00e0n theo ti\u00eau chu\u1ea9n IPC Class 3 m\u00e0 kh\u00f4ng c\u1ea7n c\u00e1c bi\u1ec7n ph\u00e1p ki\u1ec3m so\u00e1t \u0111\u1eb7c bi\u1ec7t.<\/p><\/li><\/ul>

                    Nh\u1eefng l\u01b0u \u00fd cu\u1ed1i c\u00f9ng v\u1ec1 \u0111\u1ed9 tin c\u1eady v\u00e0 vi\u1ec7c s\u1eeda ch\u1eefa l\u1ea1i<\/h2>

                    OSP s\u1ebd r\u1ea5t \u0111\u00e1ng tin c\u1eady n\u1ebfu \u0111\u01b0\u1ee3c x\u1eed l\u00fd \u0111\u00fang c\u00e1ch. C\u00e1c r\u1ee7i ro ch\u00ednh bao g\u1ed3m tr\u1ea7y x\u01b0\u1edbc, ti\u1ebfp x\u00fac qu\u00e1 l\u00e2u, th\u1eddi gian ch\u1edd \u0111\u1ee3i k\u00e9o d\u00e0i sau khi m\u1edf g\u00f3i v\u00e0 h\u00e0n nhi\u1ec7t \u0111\u1ed9 cao l\u1eb7p \u0111i l\u1eb7p l\u1ea1i. \u0110\u1ed1i v\u1edbi s\u1ea3n xu\u1ea5t h\u00e0ng lo\u1ea1t, h\u00e3y thi\u1ebft l\u1eadp c\u00e1c quy t\u1eafc r\u00f5 r\u00e0ng trong x\u01b0\u1edfng: ch\u1ec9 m\u1edf m\u1ed9t g\u00f3i t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m, s\u1eed d\u1ee5ng trong v\u00f2ng v\u00e0i gi\u1edd, h\u1ea1n ch\u1ebf s\u1ed1 l\u1ea7n h\u00e0n l\u1ea1i v\u00e0 tr\u1ea3 l\u1ea1i c\u00e1c b\u1ea3ng m\u1ea1ch nghi ng\u1edd \u0111\u1ec3 s\u1eeda ch\u1eefa. \u0110\u1ed1i v\u1edbi vi\u1ec7c s\u1eeda ch\u1eefa t\u1ea1i nh\u00e0 s\u1ea3n xu\u1ea5t PCB, h\u00e3y theo d\u00f5i s\u1ed1 l\u1ea7n s\u1eeda ch\u1eefa OSP. Kh\u00f4ng s\u1eeda ch\u1eefa c\u00f9ng m\u1ed9t b\u1ea3ng m\u1ea1ch c\u00f3 OSP qu\u00e1 ba l\u1ea7n. Sau \u0111\u00f3, lo\u1ea1i b\u1ecf b\u1ea3ng m\u1ea1ch \u0111\u00f3.<\/p>

                    Gi\u1edbi thi\u1ec7u v\u1ec1 Philifast\u00a0<\/h2>

                    Philifast cung c\u1ea5p c\u00e1c d\u1ecbch v\u1ee5 PCB v\u00e0 PCBA v\u1edbi l\u1edbp ho\u00e0n thi\u1ec7n b\u1ec1 m\u1eb7t OSP. Ch\u00fang t\u00f4i hi\u1ec3u r\u1eb1ng OSP c\u1ea7n \u0111\u01b0\u1ee3c x\u1eed l\u00fd c\u1ea9n th\u1eadn. Ch\u00fang t\u00f4i c\u00f3 th\u1ec3 cung c\u1ea5p c\u00e1c b\u1ea3ng m\u1ea1ch trong bao b\u00ec ch\u00e2n kh\u00f4ng k\u00e8m ch\u1ea5t h\u00fat \u1ea9m v\u00e0 th\u1ebb \u0111o \u0111\u1ed9 \u1ea9m. Ch\u00fang t\u00f4i h\u1ed7 tr\u1ee3 thi\u1ebft k\u1ebf khu\u00f4n in cho OSP v\u00e0 cung c\u1ea5p h\u01b0\u1edbng d\u1eabn x\u1eed l\u00fd \u0111\u1ec3 qu\u00fd kh\u00e1ch \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u1ef7 l\u1ec7 th\u00e0nh c\u00f4ng ngay t\u1eeb l\u1ea7n \u0111\u1ea7u cao h\u01a1n. N\u1ebfu qu\u00fd kh\u00e1ch c\u1ea7n c\u00e1c b\u1ea3ng m\u1ea1ch OSP v\u1edbi ch\u1ea5t l\u01b0\u1ee3ng \u1ed5n \u0111\u1ecbnh, th\u1eddi gian giao h\u00e0ng nhanh ch\u00f3ng v\u00e0 h\u1ed7 tr\u1ee3 l\u1eafp r\u00e1p thi\u1ebft th\u1ef1c, Philifast s\u1eb5n s\u00e0ng h\u1ed7 tr\u1ee3. H\u00e3y li\u00ean h\u1ec7 v\u1edbi ch\u00fang t\u00f4i v\u00e0 ch\u00fang t\u00f4i s\u1ebd \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u c\u1ee7a d\u00e2y chuy\u1ec1n l\u1eafp r\u00e1p c\u1ee7a qu\u00fd kh\u00e1ch.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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                    C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                    \n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tT\u1ea1i sao n\u00ean ch\u1ecdn OSP \u0111\u1ec3 s\u1ea3n xu\u1ea5t PCB?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

                    OSP l\u00e0 gi\u1ea3i ph\u00e1p chi ph\u00ed th\u1ea5p, th\u00e2n thi\u1ec7n v\u1edbi m\u00f4i tr\u01b0\u1eddng v\u00e0 mang l\u1ea1i \u0111\u1ed9 ph\u1eb3ng tuy\u1ec7t v\u1eddi cho c\u00e1c linh ki\u1ec7n c\u00f3 kho\u1ea3ng c\u00e1ch ch\u00e2n nh\u1ecf v\u00e0 c\u00e1c g\u00f3i BGA.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

                    \n\t\t\t\t\t
                    \n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tOSP c\u00f3 t\u01b0\u01a1ng th\u00edch v\u1edbi h\u00e0n kh\u00f4ng ch\u00ec (Pb-free) kh\u00f4ng?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

                    \u0110\u00fang v\u1eady \u2014 c\u00e1c c\u00f4ng th\u1ee9c OSP hi\u1ec7n \u0111\u1ea1i th\u01b0\u1eddng t\u01b0\u01a1ng th\u00edch v\u1edbi quy tr\u00ecnh h\u00e0n n\u00f3ng ch\u1ea3y kh\u00f4ng ch\u00ec, nh\u01b0ng n\u00ean ti\u1ebfn h\u00e0nh x\u00e1c nh\u1eadn quy tr\u00ecnh v\u00ec \u0111\u1ed9 th\u1ea5m \u01b0\u1edbt c\u00f3 th\u1ec3 thay \u0111\u1ed5i.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

                    \n\t\t\t\t\t
                    \n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tOSP c\u00f3 ph\u00f9 h\u1ee3p cho c\u00e1c c\u1ee5m linh ki\u1ec7n c\u00f3 kho\u1ea3ng c\u00e1ch ch\u00e2n nh\u1ecf v\u00e0 BGA kh\u00f4ng?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

                    \u0110\u00fang v\u1eady \u2014 OSP t\u1ea1o ra b\u1ec1 m\u1eb7t r\u1ea5t ph\u1eb3ng (r\u1ea5t ph\u00f9 h\u1ee3p cho c\u00e1c m\u1ea1ch c\u00f3 kho\u1ea3ng c\u00e1ch ch\u00e2n h\u00e0n nh\u1ecf v\u00e0 BGA). Nhi\u1ec1u nh\u00e0 s\u1ea3n xu\u1ea5t OEM \u01b0a chu\u1ed9ng OSP khi \u0111\u1ed9 ph\u1eb3ng l\u00e0 y\u1ebfu t\u1ed1 quan tr\u1ecdng.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

                    \n\t\t\t\t\t
                    \n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tNh\u1eefng nh\u01b0\u1ee3c \u0111i\u1ec3m ch\u00ednh c\u1ee7a OSP l\u00e0 g\u00ec?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

                    L\u1edbp ph\u1ee7 OSP d\u1ec5 b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi qu\u00e1 tr\u00ecnh x\u1eed l\u00fd v\u00e0 m\u00e0i m\u00f2n, c\u00f3 th\u1eddi h\u1ea1n s\u1eed d\u1ee5ng ng\u1eafn h\u01a1n so v\u1edbi c\u00e1c l\u1edbp ph\u1ee7 kim lo\u1ea1i qu\u00fd (ENIG) v\u00e0 c\u00f3 th\u1ec3 g\u00e2y ra \u0111\u1ed9 th\u1ea5m \u01b0\u1edbt kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u n\u1ebfu vi\u1ec7c ki\u1ec3m so\u00e1t quy tr\u00ecnh kh\u00f4ng t\u1ed1t.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

                    \n\t\t\t\t\t
                    \n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tOSP c\u00f3 nh\u1eefng \u0111i\u1ec3m kh\u00e1c bi\u1ec7t g\u00ec so v\u1edbi ENIG v\u00e0 m\u1ea1 b\u1ea1c ng\u00e2m?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

                    OSP c\u00f3 gi\u00e1 th\u00e0nh r\u1ebb h\u01a1n v\u00e0 b\u1ec1 m\u1eb7t ph\u1eb3ng h\u01a1n so v\u1edbi HASL, th\u01b0\u1eddng r\u1ebb h\u01a1n c\u1ea3 ENIG, nh\u01b0ng ENIG l\u1ea1i c\u00f3 th\u1eddi h\u1ea1n b\u1ea3o qu\u1ea3n l\u00e2u h\u01a1n v\u00e0 hi\u1ec7u su\u1ea5t ti\u1ebfp x\u00fac\/ch\u1ed1ng m\u00e0i m\u00f2n t\u1ed1t h\u01a1n; h\u00e3y l\u1ef1a ch\u1ecdn d\u1ef1a tr\u00ean c\u00e1c y\u00eau c\u1ea7u v\u1ec1 l\u1eafp r\u00e1p, b\u1ea3o qu\u1ea3n v\u00e0 k\u1ebft n\u1ed1i.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

                    \n\t\t\t\t\t
                    \n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tC\u00f3 l\u01b0u \u00fd \u0111\u1eb7c bi\u1ec7t n\u00e0o khi l\u1eafp r\u00e1p bo m\u1ea1ch c\u00f3 OSP kh\u00f4ng?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

                    H\u00e3y ph\u1ed1i h\u1ee3p v\u1edbi \u0111\u01a1n v\u1ecb l\u1eafp r\u00e1p \u0111\u1ec3 l\u1ef1a ch\u1ecdn ch\u1ea5t h\u00e0n\/ch\u1ea5t tr\u1ee3 h\u00e0n v\u00e0 thi\u1ebft l\u1eadp quy tr\u00ecnh nung l\u1ea1i, tr\u00e1nh th\u1ef1c hi\u1ec7n nhi\u1ec1u l\u1ea7n nung l\u1ea1i n\u1ebfu c\u00f3 th\u1ec3, \u0111\u1ed3ng th\u1eddi l\u00ean k\u1ebf ho\u1ea1ch l\u1eafp r\u00e1p ngay l\u1eadp t\u1ee9c ho\u1eb7c b\u1ea3o qu\u1ea3n c\u00f3 ki\u1ec3m so\u00e1t.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

                    OSP is a surface finish for the copper foil on printed circuit boards (PCBs). It meets the RoHS directive. In 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                    OSP is a surface finish for the copper foil on printed circuit boards (PCBs). It meets the RoHS directive. In simple terms, OSP is a thin organic film that is grown on a clean, bare copper surface by a chemical process. This film protects the copper from oxidation, heat shock, and humidity. It keeps the copper from rusting or sulfiding in normal conditions. At the same time, the film must be easy to remove quickly by flux during high-temperature soldering. That way the clean copper underneath can bond with molten solder fast and form a strong solder joint.<\\\/p>

                    As electronic products become lighter, thinner, shorter, smaller and more functional, circuit boards move toward higher precision, thinner profiles, more layers, and smaller holes. SMT has developed fast. SMT uses high-density thin boards in devices such as IC cards, mobile phones, laptops, and tuners. Hot air solder leveling (HASL) then becomes less suitable for these needs.<\\\/p>

                    \\\"\\\"<\\\/p>

                    At the same time, Sn-Pb solders used in HASL are not green. After the EU RoHS directive started on July 1, 2006, the industry needed lead-free alternatives for PCB surface finish. The common choices are OSP, ENIG (electroless nickel immersion gold), immersion silver, and immersion tin.<\\\/p>

                    OSP Process Steps<\\\/h2>

                    Typical OSP process flow:<\\\/p>

                    1. Degreasing (de-oiling) \\u2192<\\\/p><\\\/li>

                    2. Double rinse with water \\u2192<\\\/p><\\\/li>

                    3. Micro-etch \\u2192<\\\/p><\\\/li>

                    4. Double rinse with water \\u2192<\\\/p><\\\/li>

                    5. Acid wash \\u2192<\\\/p><\\\/li>

                    6. DI water rinse \\u2192<\\\/p><\\\/li>

                    7. Film formation and air dry \\u2192<\\\/p><\\\/li>

                    8. DI water rinse \\u2192<\\\/p><\\\/li>

                    9. Final drying<\\\/p><\\\/li><\\\/ol>

                      Below are details for the key steps and why they matter.<\\\/p>

                      1. Degreasing<\\\/h3>

                      Good degreasing directly affects film quality. If degreasing is bad, film thickness will be uneven. To keep degreasing stable, control the chemical concentration in the cleaner within the process range. Also check degreasing performance often. If degreasing is poor, change the cleaner in time.<\\\/p>

                      2. Micro-etch<\\\/h3>

                      Micro-etch makes the copper surface slightly rough. This helps the film bond. The micro-etch thickness affects the film formation rate. To get a stable film thickness, keep the micro-etch depth stable. Usually keeping it around 1.0\\u20131.5 \\u03bcm is appropriate. You can measure the micro-etch rate before each shift, then set the micro-etch time by that rate.<\\\/p>

                      3. Film formation<\\\/h3>

                      Before film formation, rinse with DI water to avoid contaminating the film solution. After film formation, rinse with DI water again. Keep the rinse water pH between 4.0 and 7.0 to prevent the film layer from being polluted or damaged. Controlling the OSP film thickness is the key. If the film is too thin, it has poor heat shock resistance. During reflow, the film may not survive high temperatures (about 190\\u2013200 \\u00b0C). Then soldering performance drops. On the assembly line, the film must be easy for flux to dissolve. Otherwise soldering will suffer. A common film thickness target is 0.2\\u20130.5 \\u03bcm.<\\\/p>

                      Notes on OSP film<\\\/h3>

                      OSP films are very thin and can be scratched or rubbed off easily. Handle boards carefully in production and transport. Also, after many high-temperature soldering cycles, the OSP film on unused pads can discolor or crack. That affects solderability and reliability.<\\\/p>

                      PCB Production Requirements for OSP Surface Finish<\\\/h2>

                      Below are production and handling rules to keep OSP boards reliable.<\\\/p>

                      A. General production and storage rules<\\\/h3>

                      1. PCBs with OSP should arrive in vacuum packaging. Include a desiccant and a humidity indicator card. During transit and storage, place isolation paper between boards to prevent friction damage to OSP.<\\\/p><\\\/li>

                      2. Do not expose boards to direct sunlight. Keep a proper warehouse environment. Relative humidity (RH): 30\\u201370%. Temperature: 15\\u201330 \\u00b0C. Storage life should be less than 6 months.<\\\/p><\\\/li>

                      3. When unsealing the board at the SMT station, check vacuum packaging, desiccant, and humidity card. If they fail, return the boards to the PCB maker for rework before use. Put the board onto the line within 8 hours after opening. Do not open many packs at once. Follow the rule \\u201copen as needed, produce as needed.\\u201d Long exposure causes batch soldering defects.<\\\/p><\\\/li>

                      4. After stencil printing, pass the boards into the oven quickly. Do not let them sit. The maximum wait is 1 hour. Solder paste flux can strongly corrode the OSP film.<\\\/p><\\\/li>

                      5. Keep the workshop environment steady. RH 40\\u201360%. Temperature 18\\u201327 \\u00b0C.<\\\/p><\\\/li>

                      6. During production, avoid touching the PCB surface with bare hands. Sweat and skin oils can cause oxidation.<\\\/p><\\\/li>

                      7. If you do single-side SMT first, finish the second side SMT within 12 hours.<\\\/p><\\\/li>

                      8. After SMT, finish DIP insertion as fast as possible, within 24 hours at most.<\\\/p><\\\/li>

                      9. Do not bake damp OSP boards. High-temperature baking can discolor or degrade the OSP.<\\\/p><\\\/li>

                      10. Unused boards that are overdue, damp, or cleaned after printing defects should be returned to the board maker for OSP rework. Do not rework the same board more than three times with OSP. After three reworks, scrap the board.<\\\/p><\\\/li><\\\/ol>

                        B. SMT stencil design rules for OSP boards<\\\/h3>

                        1. OSP boards are flat. That helps solder paste shape. But OSP pads cannot supply extra solder as HASL might. So enlarge stencil apertures slightly. This helps ensure solder covers the whole pad. When converting from HASL to OSP, redesign the stencil.<\\\/p><\\\/li>

                        2. After enlarging the aperture, deal with solder ball, tombstoning, and exposed copper by changing the stencil hole shape to a \\u201cconcave\\u201d design. This helps prevent solder ball formation.<\\\/p><\\\/li>

                        3. If a component placement fails and the part is missing, make sure solder paste still covers the pad as much as possible.<\\\/p><\\\/li>

                        4. To avoid exposed copper oxidation and reliability issues, consider printing solder paste on ICT test points, mounting screw holes, and exposed via pads (the backside can be wave soldered). Make sure to include these holes during stencil design.<\\\/p><\\\/li><\\\/ol>

                          C. Handling boards with bad solder paste print<\\\/h3>

                          1. Try to avoid printing errors. Cleaning will damage the OSP layer.<\\\/p><\\\/li>

                          2. If a board has poor solder paste printing, do not soak or wash OSP boards with high-volatility solvents. Because the OSP film is easy to be eaten by organic solvents, use a non-woven cloth soaked in 75% ethanol to wipe off the paste. Then use an air blower to dry. Do not use isopropyl alcohol (IPA) to clean. Do not use a scraping knife to remove paste.<\\\/p><\\\/li>

                          3. After cleaning a printing defect, finish the SMT work on that side within 1 hour.<\\\/p><\\\/li>

                          4. For large batches of printing defects (for example 20 pieces or more), return them to the PCB maker for centralized rework.<\\\/p><\\\/li><\\\/ol>

                            What are the features of OSP in SMT assembly?<\\\/h2>

                            OSP boards need strict storage and handling. From the time you open vacuum pack to the first reflow or to the time after the first reflow, the stay time must be controlled strictly. Otherwise the second reflow quality will be affected. After one reflow cycle, the organic protective film on the PCB surface is usually destroyed and the board loses oxidation protection. Then second reflow is harder. Also OSP surface finish tends to have poorer solder paste wetting than some other finishes. Solder joints can expose copper and reliability can fall. The solder appearance may not meet IPC Class 3 standard easily. Many products that use pin-in-paste (PIP) are not good matches for OSP.<\\\/p>

                            But OSP boards are flat and planar. Board manufacturing is stable and cost is low. Compared to others, OSP has clear advantages. So many companies still prefer OSP finish.<\\\/p>

                            OSP Process Advantages<\\\/h2>

                            1. Low cost for SMT assembly.<\\\/p><\\\/li>

                            2. High solder joint strength.<\\\/p><\\\/li>

                            3. Good solderability when handled correctly.<\\\/p><\\\/li>

                            4. Flat surface suitable for high-density pad design.<\\\/p><\\\/li>

                            5. Compatible with mixed surface finishes (selective ENIG, for example).<\\\/p><\\\/li>

                            6. Easy to rework.<\\\/p><\\\/li><\\\/ol>

                              \\\"Six-layer<\\\/p>

                              OSP Process Disadvantages<\\\/h2>

                              1. Higher contact resistance. This can affect electrical testing.<\\\/p><\\\/li>

                              2. Not good for through-hole soldering by line soldering.<\\\/p><\\\/li>

                              3. Poor thermal stability and process robustness. After one high-temperature reflow, there is usually no more oxidation protection. The process window is short. All SMT steps after the first soldering should be finished within 24 hours.<\\\/p><\\\/li>

                              4. Not corrosion resistant.<\\\/p><\\\/li>

                              5. High demand on printing accuracy. Cleaning will damage OSP film (alcohols and acids can degrade OSP).<\\\/p><\\\/li>

                              6. Poor solder-through performance for wave soldering holes.<\\\/p><\\\/li><\\\/ol>

                                Practical tips for using OSP boards on an assembly line<\\\/h2>

                                • Always get OSP boards in vacuum packs with desiccant and a humidity card. Open one pack at a time. Use boards quickly.<\\\/p><\\\/li>

                                • Avoid touching exposed pads. Use gloves or tweezers when you must.<\\\/p><\\\/li>

                                • Keep the assembly environment stable: RH 40\\u201360%, temp 18\\u201327 \\u00b0C.<\\\/p><\\\/li>

                                • Do not leave boards printed for more than one hour before reflow.<\\\/p><\\\/li>

                                • Keep time between first reflow and subsequent process steps short. Aim to finish all SMT within 24 hours after first reflow. Store reflowed boards in a dry cabinet if delay is unavoidable, and follow your PCB supplier\\u2019s guidance.<\\\/p><\\\/li>

                                • If you need to clean paste defects, use 75% ethanol on a non-woven cloth. Wipe gently. Dry with air. Do not soak. Do not use IPA or harsh solvents. Do not scrape with a blade.<\\\/p><\\\/li>

                                • Design stencils with slightly larger apertures for OSP pads. Consider concave aperture shapes to reduce solder ball issues.<\\\/p><\\\/li>

                                • For exposed test points and screw holes, consider printing solder paste to protect the copper if the design allows.<\\\/p><\\\/li><\\\/ul>

                                  When to choose OSP<\\\/h2>

                                  Choose OSP when:<\\\/p>

                                  • You need a low-cost finish for high-density SMT boards.<\\\/p><\\\/li>

                                  • You need a flat surface for fine pitch components.<\\\/p><\\\/li>

                                  • Your assembly flow can control storage and timing strictly.<\\\/p><\\\/li>

                                  • You accept the limits on thermal cycles and wave soldering.<\\\/p><\\\/li><\\\/ul>

                                    Do not choose OSP when:<\\\/p>

                                    • You need many high-temp cycles, or many wave-soldering steps.<\\\/p><\\\/li>

                                    • You need long-term shelf life on exposed pads in the field without protection.<\\\/p><\\\/li>

                                    • Your product must pass strict IPC Class 3 visual or solderability requirements without special controls.<\\\/p><\\\/li><\\\/ul>

                                      Final notes on reliability and rework<\\\/h2>

                                      OSP is reliable when handled right. The main risks are scratches, long exposure, long waits after opening, and repeated high-temp soldering. For mass production, set clear rules in the shop: one pack open at a time, use within hours, limit reflow cycles, and return suspect boards for rework. For rework at the PCB maker, track OSP rework counts. Do not rework the same board with OSP more than three times. After that, scrap the board.<\\\/p>

                                      About Philifast\\u00a0<\\\/h2>

                                      Philifast offers PCB and PCBA services with OSP surface finish. We know OSP needs careful handling. We can supply boards in vacuum packs with desiccant and humidity cards. We help design stencils for OSP and give handling guidance so you get higher first-pass yield. If you need OSP boards with stable quality, fast lead times, and practical assembly support, Philifast can help. Contact us and we will work with your assembly line requirements.<\\\/p>\",\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"b1a7e76\"}]},\"elements\":[],\"widgetType\":\"text-editor\"}],\"isInner\":false},{\"id\":\"109iy0c\",\"elType\":\"section\",\"settings\":{\"gap\":\"no\",\"content_position\":\"top\",\"background_background\":\"classic\",\"background_position\":\"bottom center\",\"background_attachment\":\"scroll\",\"background_repeat\":\"no-repeat\",\"background_size\":\"cover\",\"background_size_mobile\":\"cover\",\"background_overlay_background\":\"classic\",\"background_overlay_color_b\":\"rgba(255,255,255,0)\",\"background_overlay_opacity\":{\"unit\":\"px\",\"size\":\"\",\"sizes\":[]},\"padding\":{\"unit\":\"px\",\"top\":\"0\",\"right\":\"0\",\"bottom\":\"0\",\"left\":\"0\",\"isLinked\":false},\"padding_tablet\":{\"unit\":\"px\",\"top\":\"80\",\"right\":\"40\",\"bottom\":\"80\",\"left\":\"40\",\"isLinked\":false},\"padding_mobile\":{\"unit\":\"px\",\"top\":\"50\",\"right\":\"25\",\"bottom\":\"50\",\"left\":\"25\",\"isLinked\":false},\"content_width\":{\"unit\":\"px\",\"size\":800,\"sizes\":[]},\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"c3bb59e\"}],\"margin\":{\"unit\":\"px\",\"top\":\"0\",\"right\":0,\"bottom\":\"0\",\"left\":0,\"isLinked\":true}},\"elements\":[{\"id\":\"7882748\",\"elType\":\"column\",\"settings\":{\"_column_size\":100,\"_inline_size\":null,\"padding\":{\"unit\":\"px\",\"top\":\"0\",\"right\":\"0\",\"bottom\":\"0\",\"left\":\"0\",\"isLinked\":true},\"space_between_widgets\":40,\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"36ea341\"}]},\"elements\":[{\"id\":\"9fc6712\",\"elType\":\"widget\",\"settings\":{\"title\":\"Frequently Asked Questions\",\"align\":\"center\",\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"39dacd0\"}]},\"elements\":[],\"widgetType\":\"heading\"},{\"id\":\"631b990\",\"elType\":\"widget\",\"settings\":{\"tabs\":[{\"tab_title\":\"Why choose OSP for my PCB?\",\"tab_content\":\"

                                      OSP is low-cost, environmentally friendly and provides excellent planarity for fine-pitch components and BGAs.<\\\/p>\",\"_id\":\"9c164e4\"},{\"_id\":\"b6473e1\",\"tab_title\":\"Is OSP compatible with lead-free soldering (Pb-free)?\",\"tab_content\":\"

                                      Yes\\u2014modern OSP formulations are generally compatible with lead-free reflow, but process validation is recommended because wettability can vary.<\\\/p>\"},{\"_id\":\"adeb2ae\",\"tab_title\":\"Is OSP suitable for fine-pitch and BGA assemblies?\",\"tab_content\":\"

                                      Yes\\u2014OSP gives a very flat surface (good for fine-pitch and BGA). Many OEMs prefer OSP when planarity is critical.<\\\/p>\"},{\"_id\":\"40ca113\",\"tab_title\":\"What are the main downsides of OSP?\",\"tab_content\":\"

                                      OSP is sensitive to handling and abrasion, has a shorter shelf life than noble metal finishes (ENIG), and can give variable wettability if process control is poor.<\\\/p>\"},{\"_id\":\"1d78fb7\",\"tab_title\":\"How does OSP compare with ENIG and immersion silver?\",\"tab_content\":\"

                                      OSP is cheaper and more planar than HASL, often cheaper than ENIG, but ENIG gives longer shelf life and better contact\\\/wear performance; choose by assembly, storage and mating needs.<\\\/p>\"},{\"_id\":\"e40a4af\",\"tab_title\":\"Any special assembly notes for boards with OSP?\",\"tab_content\":\"

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                                      \\n\\t\\t\\t\\t\\t
                                      \\n\\t\\t[elementor-element k=\\\"0e46bd9387093ca73b9000e38f18cce4\\\" data=\\\"{"id":"b8a1178","elType":"widget","settings":{"editor":"<p data-start=\"52\" data-end=\"614\">OSP is a surface finish for the copper foil on printed circuit boards (PCBs). It meets the RoHS directive. In simple terms, OSP is a thin organic film that is grown on a clean, bare copper surface by a chemical process. This film protects the copper from oxidation, heat shock, and humidity. It keeps the copper from rusting or sulfiding in normal conditions. At the same time, the film must be easy to remove quickly by flux during high-temperature soldering. That way the clean copper underneath can bond with molten solder fast and form a strong solder joint.<\/p><p data-start=\"616\" data-end=\"994\">As electronic products become lighter, thinner, shorter, smaller and more functional, circuit boards move toward higher precision, thinner profiles, more layers, and smaller holes. SMT has developed fast. SMT uses high-density thin boards in devices such as IC cards, mobile phones, laptops, and tuners. Hot air solder leveling (HASL) then becomes less suitable for these needs.<\/p><p data-start=\"616\" data-end=\"994\"><img class=\"alignnone size-full wp-image-2840\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/OSP-PCB.webp\" alt=\"\" width=\"500\" height=\"375\" \/><\/p><p data-start=\"996\" data-end=\"1282\">At the same time, Sn-Pb solders used in HASL are not green. After the EU RoHS directive started on July 1, 2006, the industry needed lead-free alternatives for PCB surface finish. The common choices are OSP, ENIG (electroless nickel immersion gold), immersion silver, and immersion tin.<\/p><h2 data-start=\"1284\" data-end=\"1303\">OSP Process Steps<\/h2><p data-start=\"1305\" data-end=\"1330\">Typical OSP process flow:<\/p><ol data-start=\"1331\" data-end=\"1551\"><li data-start=\"1331\" data-end=\"1360\"><p data-start=\"1334\" data-end=\"1360\">Degreasing (de-oiling) \u2192<\/p><\/li><li data-start=\"1361\" data-end=\"1391\"><p data-start=\"1364\" data-end=\"1391\">Double rinse with water \u2192<\/p><\/li><li data-start=\"1392\" data-end=\"1409\"><p data-start=\"1395\" data-end=\"1409\">Micro-etch \u2192<\/p><\/li><li data-start=\"1410\" data-end=\"1440\"><p data-start=\"1413\" data-end=\"1440\">Double rinse with water \u2192<\/p><\/li><li data-start=\"1441\" data-end=\"1457\"><p data-start=\"1444\" data-end=\"1457\">Acid wash \u2192<\/p><\/li><li data-start=\"1458\" data-end=\"1479\"><p data-start=\"1461\" data-end=\"1479\">DI water rinse \u2192<\/p><\/li><li data-start=\"1480\" data-end=\"1513\"><p data-start=\"1483\" data-end=\"1513\">Film formation and air dry \u2192<\/p><\/li><li data-start=\"1514\" data-end=\"1535\"><p data-start=\"1517\" data-end=\"1535\">DI water rinse \u2192<\/p><\/li><li data-start=\"1536\" data-end=\"1551\"><p data-start=\"1539\" data-end=\"1551\">Final drying<\/p><\/li><\/ol><p data-start=\"1553\" data-end=\"1609\">Below are details for the key steps and why they matter.<\/p><h3 data-start=\"1611\" data-end=\"1627\">1. Degreasing<\/h3><p data-start=\"1628\" data-end=\"1922\">Good degreasing directly affects film quality. If degreasing is bad, film thickness will be uneven. To keep degreasing stable, control the chemical concentration in the cleaner within the process range. Also check degreasing performance often. If degreasing is poor, change the cleaner in time.<\/p><h3 data-start=\"1924\" data-end=\"1940\">2. Micro-etch<\/h3><p data-start=\"1941\" data-end=\"2293\">Micro-etch makes the copper surface slightly rough. This helps the film bond. The micro-etch thickness affects the film formation rate. To get a stable film thickness, keep the micro-etch depth stable. Usually keeping it around 1.0\u20131.5 \u03bcm is appropriate. You can measure the micro-etch rate before each shift, then set the micro-etch time by that rate.<\/p><h3 data-start=\"2295\" data-end=\"2315\">3. Film formation<\/h3><p data-start=\"2316\" data-end=\"2915\">Before film formation, rinse with DI water to avoid contaminating the film solution. After film formation, rinse with DI water again. Keep the rinse water pH between 4.0 and 7.0 to prevent the film layer from being polluted or damaged. Controlling the OSP film thickness is the key. If the film is too thin, it has poor heat shock resistance. During reflow, the film may not survive high temperatures (about 190\u2013200 \u00b0C). Then soldering performance drops. On the assembly line, the film must be easy for flux to dissolve. Otherwise soldering will suffer. A common film thickness target is 0.2\u20130.5 \u03bcm.<\/p><h3 data-start=\"2917\" data-end=\"2937\">Notes on OSP film<\/h3><p data-start=\"2938\" data-end=\"3204\">OSP films are very thin and can be scratched or rubbed off easily. Handle boards carefully in production and transport. Also, after many high-temperature soldering cycles, the OSP film on unused pads can discolor or crack. That affects solderability and reliability.<\/p><h2 data-start=\"3206\" data-end=\"3258\">PCB Production Requirements for OSP Surface Finish<\/h2><p data-start=\"3260\" data-end=\"3328\">Below are production and handling rules to keep OSP boards reliable.<\/p><h3 data-start=\"3330\" data-end=\"3372\">A. General production and storage rules<\/h3><ol data-start=\"3373\" data-end=\"4958\"><li data-start=\"3373\" data-end=\"3575\"><p data-start=\"3376\" data-end=\"3575\">PCBs with OSP should arrive in vacuum packaging. Include a desiccant and a humidity indicator card. During transit and storage, place isolation paper between boards to prevent friction damage to OSP.<\/p><\/li><li data-start=\"3577\" data-end=\"3755\"><p data-start=\"3580\" data-end=\"3755\">Do not expose boards to direct sunlight. Keep a proper warehouse environment. Relative humidity (RH): 30\u201370%. Temperature: 15\u201330 \u00b0C. Storage life should be less than 6 months.<\/p><\/li><li data-start=\"3757\" data-end=\"4119\"><p data-start=\"3760\" data-end=\"4119\">When unsealing the board at the SMT station, check vacuum packaging, desiccant, and humidity card. If they fail, return the boards to the PCB maker for rework before use. Put the board onto the line within 8 hours after opening. Do not open many packs at once. Follow the rule \u201copen as needed, produce as needed.\u201d Long exposure causes batch soldering defects.<\/p><\/li><li data-start=\"4121\" data-end=\"4288\"><p data-start=\"4124\" data-end=\"4288\">After stencil printing, pass the boards into the oven quickly. Do not let them sit. The maximum wait is 1 hour. Solder paste flux can strongly corrode the OSP film.<\/p><\/li><li data-start=\"4290\" data-end=\"4363\"><p data-start=\"4293\" data-end=\"4363\">Keep the workshop environment steady. RH 40\u201360%. Temperature 18\u201327 \u00b0C.<\/p><\/li><li data-start=\"4365\" data-end=\"4475\"><p data-start=\"4368\" data-end=\"4475\">During production, avoid touching the PCB surface with bare hands. Sweat and skin oils can cause oxidation.<\/p><\/li><li data-start=\"4477\" data-end=\"4556\"><p data-start=\"4480\" data-end=\"4556\">If you do single-side SMT first, finish the second side SMT within 12 hours.<\/p><\/li><li data-start=\"4558\" data-end=\"4638\"><p data-start=\"4561\" data-end=\"4638\">After SMT, finish DIP insertion as fast as possible, within 24 hours at most.<\/p><\/li><li data-start=\"4640\" data-end=\"4728\"><p data-start=\"4643\" data-end=\"4728\">Do not bake damp OSP boards. High-temperature baking can discolor or degrade the OSP.<\/p><\/li><li data-start=\"4730\" data-end=\"4958\"><p data-start=\"4734\" data-end=\"4958\">Unused boards that are overdue, damp, or cleaned after printing defects should be returned to the board maker for OSP rework. Do not rework the same board more than three times with OSP. After three reworks, scrap the board.<\/p><\/li><\/ol><h3 data-start=\"4960\" data-end=\"5005\">B. SMT stencil design rules for OSP boards<\/h3><ol data-start=\"5006\" data-end=\"5820\"><li data-start=\"5006\" data-end=\"5257\"><p data-start=\"5009\" data-end=\"5257\">OSP boards are flat. That helps solder paste shape. But OSP pads cannot supply extra solder as HASL might. So enlarge stencil apertures slightly. This helps ensure solder covers the whole pad. When converting from HASL to OSP, redesign the stencil.<\/p><\/li><li data-start=\"5259\" data-end=\"5446\"><p data-start=\"5262\" data-end=\"5446\">After enlarging the aperture, deal with solder ball, tombstoning, and exposed copper by changing the stencil hole shape to a \u201cconcave\u201d design. This helps prevent solder ball formation.<\/p><\/li><li data-start=\"5448\" data-end=\"5571\"><p data-start=\"5451\" data-end=\"5571\">If a component placement fails and the part is missing, make sure solder paste still covers the pad as much as possible.<\/p><\/li><li data-start=\"5573\" data-end=\"5820\"><p data-start=\"5576\" data-end=\"5820\">To avoid exposed copper oxidation and reliability issues, consider printing solder paste on ICT test points, mounting screw holes, and exposed via pads (the backside can be wave soldered). Make sure to include these holes during stencil design.<\/p><\/li><\/ol><h3 data-start=\"5822\" data-end=\"5871\">C. Handling boards with bad solder paste print<\/h3><ol data-start=\"5872\" data-end=\"6513\"><li data-start=\"5872\" data-end=\"5940\"><p data-start=\"5875\" data-end=\"5940\">Try to avoid printing errors. Cleaning will damage the OSP layer.<\/p><\/li><li data-start=\"5942\" data-end=\"6299\"><p data-start=\"5945\" data-end=\"6299\">If a board has poor solder paste printing, do not soak or wash OSP boards with high-volatility solvents. Because the OSP film is easy to be eaten by organic solvents, use a non-woven cloth soaked in 75% ethanol to wipe off the paste. Then use an air blower to dry. Do not use isopropyl alcohol (IPA) to clean. Do not use a scraping knife to remove paste.<\/p><\/li><li data-start=\"6301\" data-end=\"6385\"><p data-start=\"6304\" data-end=\"6385\">After cleaning a printing defect, finish the SMT work on that side within 1 hour.<\/p><\/li><li data-start=\"6387\" data-end=\"6513\"><p data-start=\"6390\" data-end=\"6513\">For large batches of printing defects (for example 20 pieces or more), return them to the PCB maker for centralized rework.<\/p><\/li><\/ol><h2 data-start=\"6515\" data-end=\"6562\">What are the features of OSP in SMT assembly?<\/h2><p data-start=\"6564\" data-end=\"7249\">OSP boards need strict storage and handling. From the time you open vacuum pack to the first reflow or to the time after the first reflow, the stay time must be controlled strictly. Otherwise the second reflow quality will be affected. After one reflow cycle, the organic protective film on the PCB surface is usually destroyed and the board loses oxidation protection. Then second reflow is harder. Also OSP surface finish tends to have poorer solder paste wetting than some other finishes. Solder joints can expose copper and reliability can fall. The solder appearance may not meet IPC Class 3 standard easily. Many products that use pin-in-paste (PIP) are not good matches for OSP.<\/p><p data-start=\"7251\" data-end=\"7422\">But OSP boards are flat and planar. Board manufacturing is stable and cost is low. Compared to others, OSP has clear advantages. So many companies still prefer OSP finish.<\/p><h2 data-start=\"7424\" data-end=\"7448\">OSP Process Advantages<\/h2><ol data-start=\"7449\" data-end=\"7711\"><li data-start=\"7449\" data-end=\"7480\"><p data-start=\"7452\" data-end=\"7480\">Low cost for SMT assembly.<\/p><\/li><li data-start=\"7481\" data-end=\"7513\"><p data-start=\"7484\" data-end=\"7513\">High solder joint strength.<\/p><\/li><li data-start=\"7514\" data-end=\"7561\"><p data-start=\"7517\" data-end=\"7561\">Good solderability when handled correctly.<\/p><\/li><li data-start=\"7562\" data-end=\"7617\"><p data-start=\"7565\" data-end=\"7617\">Flat surface suitable for high-density pad design.<\/p><\/li><li data-start=\"7618\" data-end=\"7692\"><p data-start=\"7621\" data-end=\"7692\">Compatible with mixed surface finishes (selective ENIG, for example).<\/p><\/li><li data-start=\"7693\" data-end=\"7711\"><p data-start=\"7696\" data-end=\"7711\">Easy to rework.<\/p><\/li><\/ol><p><img class=\"alignnone size-full wp-image-2841\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/Six-layer-OSP-protected-through-hole-PCB.webp\" alt=\"Six-layer OSP-protected through-hole PCB\" width=\"600\" height=\"420\" \/><\/p><h2 data-start=\"7713\" data-end=\"7740\">OSP Process Disadvantages<\/h2><ol data-start=\"7741\" data-end=\"8305\"><li data-start=\"7741\" data-end=\"7808\"><p data-start=\"7744\" data-end=\"7808\">Higher contact resistance. This can affect electrical testing.<\/p><\/li><li data-start=\"7809\" data-end=\"7868\"><p data-start=\"7812\" data-end=\"7868\">Not good for through-hole soldering by line soldering.<\/p><\/li><li data-start=\"7869\" data-end=\"8107\"><p data-start=\"7872\" data-end=\"8107\">Poor thermal stability and process robustness. After one high-temperature reflow, there is usually no more oxidation protection. The process window is short. All SMT steps after the first soldering should be finished within 24 hours.<\/p><\/li><li data-start=\"8108\" data-end=\"8137\"><p data-start=\"8111\" data-end=\"8137\">Not corrosion resistant.<\/p><\/li><li data-start=\"8138\" data-end=\"8244\"><p data-start=\"8141\" data-end=\"8244\">High demand on printing accuracy. Cleaning will damage OSP film (alcohols and acids can degrade OSP).<\/p><\/li><li data-start=\"8245\" data-end=\"8305\"><p data-start=\"8248\" data-end=\"8305\">Poor solder-through performance for wave soldering holes.<\/p><\/li><\/ol><h2 data-start=\"8307\" data-end=\"8364\">Practical tips for using OSP boards on an assembly line<\/h2><ul data-start=\"8366\" data-end=\"9357\"><li data-start=\"8366\" data-end=\"8488\"><p data-start=\"8368\" data-end=\"8488\">Always get OSP boards in vacuum packs with desiccant and a humidity card. Open one pack at a time. Use boards quickly.<\/p><\/li><li data-start=\"8489\" data-end=\"8559\"><p data-start=\"8491\" data-end=\"8559\">Avoid touching exposed pads. Use gloves or tweezers when you must.<\/p><\/li><li data-start=\"8560\" data-end=\"8627\"><p data-start=\"8562\" data-end=\"8627\">Keep the assembly environment stable: RH 40\u201360%, temp 18\u201327 \u00b0C.<\/p><\/li><li data-start=\"8628\" data-end=\"8697\"><p data-start=\"8630\" data-end=\"8697\">Do not leave boards printed for more than one hour before reflow.<\/p><\/li><li data-start=\"8698\" data-end=\"8931\"><p data-start=\"8700\" data-end=\"8931\">Keep time between first reflow and subsequent process steps short. Aim to finish all SMT within 24 hours after first reflow. Store reflowed boards in a dry cabinet if delay is unavoidable, and follow your PCB supplier\u2019s guidance.<\/p><\/li><li data-start=\"8932\" data-end=\"9111\"><p data-start=\"8934\" data-end=\"9111\">If you need to clean paste defects, use 75% ethanol on a non-woven cloth. Wipe gently. Dry with air. Do not soak. Do not use IPA or harsh solvents. Do not scrape with a blade.<\/p><\/li><li data-start=\"9112\" data-end=\"9239\"><p data-start=\"9114\" data-end=\"9239\">Design stencils with slightly larger apertures for OSP pads. Consider concave aperture shapes to reduce solder ball issues.<\/p><\/li><li data-start=\"9240\" data-end=\"9357\"><p data-start=\"9242\" data-end=\"9357\">For exposed test points and screw holes, consider printing solder paste to protect the copper if the design allows.<\/p><\/li><\/ul><h2 data-start=\"9359\" data-end=\"9379\">When to choose OSP<\/h2><p data-start=\"9381\" data-end=\"9397\">Choose OSP when:<\/p><ul data-start=\"9398\" data-end=\"9638\"><li data-start=\"9398\" data-end=\"9457\"><p data-start=\"9400\" data-end=\"9457\">You need a low-cost finish for high-density SMT boards.<\/p><\/li><li data-start=\"9458\" data-end=\"9512\"><p data-start=\"9460\" data-end=\"9512\">You need a flat surface for fine pitch components.<\/p><\/li><li data-start=\"9513\" data-end=\"9576\"><p data-start=\"9515\" data-end=\"9576\">Your assembly flow can control storage and timing strictly.<\/p><\/li><li data-start=\"9577\" data-end=\"9638\"><p data-start=\"9579\" data-end=\"9638\">You accept the limits on thermal cycles and wave soldering.<\/p><\/li><\/ul><p data-start=\"9640\" data-end=\"9663\">Do not choose OSP when:<\/p><ul data-start=\"9664\" data-end=\"9919\"><li data-start=\"9664\" data-end=\"9729\"><p data-start=\"9666\" data-end=\"9729\">You need many high-temp cycles, or many wave-soldering steps.<\/p><\/li><li data-start=\"9730\" data-end=\"9812\"><p data-start=\"9732\" data-end=\"9812\">You need long-term shelf life on exposed pads in the field without protection.<\/p><\/li><li data-start=\"9813\" data-end=\"9919\"><p data-start=\"9815\" data-end=\"9919\">Your product must pass strict IPC Class 3 visual or solderability requirements without special controls.<\/p><\/li><\/ul><h2 data-start=\"9921\" data-end=\"9960\">Final notes on reliability and rework<\/h2><p data-start=\"9962\" data-end=\"10398\">OSP is reliable when handled right. The main risks are scratches, long exposure, long waits after opening, and repeated high-temp soldering. For mass production, set clear rules in the shop: one pack open at a time, use within hours, limit reflow cycles, and return suspect boards for rework. For rework at the PCB maker, track OSP rework counts. Do not rework the same board with OSP more than three times. After that, scrap the board.<\/p><h2 data-start=\"10400\" data-end=\"10449\">About Philifast\u00a0<\/h2><p data-start=\"10451\" data-end=\"10896\">Philifast offers PCB and PCBA services with OSP surface finish. We know OSP needs careful handling. We can supply boards in vacuum packs with desiccant and humidity cards. We help design stencils for OSP and give handling guidance so you get higher first-pass yield. If you need OSP boards with stable quality, fast lead times, and practical assembly support, Philifast can help. Contact us and we will work with your assembly line requirements.<\/p>","display_condition_list":[{"display_condition_login_status":"subscriber","_id":"b1a7e76"}]},"elements":[],"widgetType":"text-editor"}\\\"]\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t
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                                      Frequently Asked Questions<\\\/h2>\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t
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                                      \\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\tWhy choose OSP for my PCB?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t

                                      OSP is low-cost, environmentally friendly and provides excellent planarity for fine-pitch components and BGAs.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t

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                                      \\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\tIs OSP compatible with lead-free soldering (Pb-free)?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t

                                      Yes\\u2014modern OSP formulations are generally compatible with lead-free reflow, but process validation is recommended because wettability can vary.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t

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                                      \\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\tIs OSP suitable for fine-pitch and BGA assemblies?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t

                                      Yes\\u2014OSP gives a very flat surface (good for fine-pitch and BGA). Many OEMs prefer OSP when planarity is critical.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t

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                                      \\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\tWhat are the main downsides of OSP?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t

                                      OSP is sensitive to handling and abrasion, has a shorter shelf life than noble metal finishes (ENIG), and can give variable wettability if process control is poor.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t

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                                      \\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\tHow does OSP compare with ENIG and immersion silver?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t

                                      OSP is cheaper and more planar than HASL, often cheaper than ENIG, but ENIG gives longer shelf life and better contact\\\/wear performance; choose by assembly, storage and mating needs.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t

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                                      \\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\tAny special assembly notes for boards with OSP?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t

                                      Coordinate paste\\\/flux selection and reflow profile with your assembler, avoid multiple reflows when possible, and plan for immediate assembly or controlled storage.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t<\\\/section>\\n\\t\\t\",\"scripts\":[],\"styles\":[]}}"],"_uag_page_assets":["a:9:{s:3:\"css\";s:30170:\".uag-blocks-common-selector{z-index:var(--z-index-desktop) !important}@media(max-width: 976px){.uag-blocks-common-selector{z-index:var(--z-index-tablet) !important}}@media(max-width: 767px){.uag-blocks-common-selector{z-index:var(--z-index-mobile) !important}}.uagb-social-share__outer-wrap,.uagb-social-share__wrap{display:flex;align-items:center;justify-content:center}.uagb-social-share__layout-vertical.uagb-social-share__outer-wrap,.uagb-social-share__layout-vertical 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