{"id":4765,"date":"2026-03-04T07:26:34","date_gmt":"2026-03-04T07:26:34","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4765"},"modified":"2026-03-04T07:26:37","modified_gmt":"2026-03-04T07:26:37","slug":"preventing-caf-in-pcbs-causes-fixes","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/cs\/preventing-caf-in-pcbs-causes-fixes\/","title":{"rendered":"Prevence CAF v PCB: P\u0159\u00ed\u010diny a opravy"},"content":{"rendered":"<h2 class=\"wp-block-heading\">1. P\u0159ehled ned\u00e1vn\u00fdch probl\u00e9m\u016f s \u00faniky PCB<\/h2>\n\n\n\n<p>Ned\u00e1vno jsme se pot\u00fdkali s probl\u00e9mem \u00faniku PCB. V\u00fdrobek m\u00e1 n\u00edzkou spot\u0159ebu energie. Cel\u00e9 za\u0159\u00edzen\u00ed b\u011b\u017en\u011b odeb\u00edr\u00e1 proud na \u00farovni mikroamp\u00e9r\u016f (\u00b5A). Po ur\u010dit\u00e9 dob\u011b st\u00e1rnut\u00ed p\u0159i norm\u00e1ln\u00ed teplot\u011b jsme zjistili, \u017ee jeho spot\u0159eba energie vzrostla. N\u011bkter\u00e9 vzorky dokonce dos\u00e1hly hodnoty miliamp\u00e9r (mA).<\/p>\n\n\n\n<p>Pe\u010dliv\u011b jsme vylou\u010dili z\u00e1vady komponent. Nakonec jsme na\u0161li uzel 5 V. Kdy\u017e byl v\u00fdrobek v re\u017eimu sp\u00e1nku, m\u011blo b\u00fdt v tomto uzlu 0 V, ale byl v n\u011bm pokles asi o 1,8 V.<\/p>\n\n\n\n<p>Pe\u010dliv\u011b vy\u0159ez\u00e1v\u00e1me stopy na desk\u00e1ch plo\u0161n\u00fdch spoj\u016f. K na\u0161emu p\u0159ekvapen\u00ed bylo mo\u017en\u00e9 zm\u011b\u0159it dv\u011b pr\u016fchodky, kter\u00e9 nem\u011bly na desce plo\u0161n\u00fdch spoj\u016f \u017e\u00e1dn\u00e9 elektrick\u00e9 spojen\u00ed a vykazovaly mezi sebou odpor n\u011bkolik set ohm\u016f. Zkontrolovali jsme n\u00e1vrhov\u00e9 soubory. Jedn\u00e1 se o dvouvrstvou desku. Rozte\u010d pr\u016fchodek a podlo\u017eek &gt; 6 mil. Rozte\u010d mezi otvory a st\u011bnami &gt; 18 mil. Tato konstrukce je b\u011b\u017en\u00e1 pro standardn\u00ed vrt\u00e1n\u00ed v pr\u016fmyslu plo\u0161n\u00fdch spoj\u016f.<\/p>\n\n\n\n<p>Odstranili jsme p\u00e1jec\u00ed masku, abychom vylou\u010dili vodiv\u00e9 zne\u010di\u0161t\u011bn\u00ed na povrchu masky nebo pr\u016fchodek. Nam\u011b\u0159en\u00fd odpor mezi pr\u016fchodkami st\u00e1le existoval. Chv\u00edli jsme si to nedok\u00e1zali vysv\u011btlit. Pak jsme zjistili, \u017ee \u00fanik je zp\u016fsoben \u201cefektem CAF\u201d.\u201d<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. Co je CAF<\/h2>\n\n\n\n<p>CAF znamen\u00e1 Conductive Anodic Filamentation (vodiv\u00e1 anodick\u00e1 filamentace). Jedn\u00e1 se o \u00fanikov\u00e9 chov\u00e1n\u00ed uvnit\u0159 desky plo\u0161n\u00fdch spoj\u016f, kdy se ionty m\u011bdi pohybuj\u00ed od anody (vy\u0161\u0161\u00ed nap\u011bt\u00ed) pod\u00e9l mikrotrhlinov\u00fdch kan\u00e1lk\u016f mezi sklen\u011bn\u00fdmi vl\u00e1kny sm\u011brem ke katod\u011b (ni\u017e\u0161\u00ed nap\u011bt\u00ed). B\u011bhem tohoto procesu doch\u00e1z\u00ed k \u00faniku m\u011bdi a m\u011b\u010fnat\u00fdch sol\u00ed.<\/p>\n\n\n\n<p>Na obr\u00e1zku po pod\u00e9ln\u00e9m vybrou\u0161en\u00ed dvou sousedn\u00edch pr\u016fchodek a pohledu na n\u011b pod elektronov\u00fdm mikroskopem p\u0159i 100\u00d7 vypad\u00e1 lamin\u00e1t tmav\u011b. Sv\u011btl\u00e9 zlat\u00e9 oblasti jsou m\u011bd\u011bn\u00e9. Mezi ob\u011bma pr\u016fchodkami jsou vid\u011bt m\u011bd\u011bn\u00e9 skvrny a m\u011bd\u011bn\u00e1 vl\u00e1kna.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"641\" height=\"500\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/CAF.webp\" alt=\"CAF\" class=\"wp-image-4766\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/CAF.webp 641w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/CAF-300x234.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/CAF-15x12.webp 15w\" sizes=\"(max-width: 641px) 100vw, 641px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">3. Jak se tvo\u0159\u00ed CAF (mechanismus)<\/h2>\n\n\n\n<p>Norm\u00e1ln\u00ed <a href=\"https:\/\/flj-pcb.com\/cs\/fr-4-pcb-guide-properties-limits-material-choices\/\" data-type=\"post\" data-id=\"4641\">fr4 lamin\u00e1t PCB<\/a> se vyr\u00e1b\u00ed vetk\u00e1n\u00edm sklen\u011bn\u00fdch vl\u00e1ken do tkaniny, n\u00e1sledn\u00fdm sm\u00e1\u010den\u00edm epoxidovou prysky\u0159ic\u00ed a polotvrdnut\u00edm. Pokud je p\u0159ilnavost mezi prysky\u0159ic\u00ed a sklen\u011bn\u00fdmi vl\u00e1kny \u0161patn\u00e1 nebo pokud prysky\u0159ice sklo zcela nenamo\u010d\u00ed, mohou mezi nimi vzniknout mezery. P\u0159i mechanick\u00e9m zpracov\u00e1n\u00ed, jako je vrt\u00e1n\u00ed, m\u016f\u017ee tangenci\u00e1ln\u00ed tah a axi\u00e1ln\u00ed r\u00e1z d\u00e1le po\u0161kodit spojen\u00ed prysky\u0159ice. To m\u016f\u017ee uvolnit nebo odd\u011blit svazky vl\u00e1ken a vytvo\u0159it mezery.<\/p>\n\n\n\n<p>V hork\u00e9m a vlhk\u00e9m prost\u0159ed\u00ed doch\u00e1z\u00ed k v\u011bt\u0161\u00ed degradaci adheze mezi epoxidem a sklen\u011bn\u00fdmi vl\u00e1kny. Silanov\u00e9 spojovac\u00ed l\u00e1tky na povrchu sklen\u011bn\u00fdch vl\u00e1ken mohou hydrolyzovat. T\u00edm se pod\u00e9l v\u00fdztu\u017ee ze sklen\u011bn\u00fdch vl\u00e1ken vytvo\u0159\u00ed cesty, kter\u00e9 umo\u017e\u0148uj\u00ed migraci elektron\u016f.<\/p>\n\n\n\n<p>Za t\u011bchto podm\u00ednek, pokud maj\u00ed dv\u011b bl\u00edzk\u00e9 pr\u016fchodky rozd\u00edl potenci\u00e1l\u016f, m\u016f\u017ee m\u011b\u010f na anod\u011b s vy\u0161\u0161\u00edm nap\u011bt\u00edm oxidovat na m\u011b\u010fnat\u00e9 ionty. Pod elektrick\u00fdm polem se ionty m\u011bdi pohybuj\u00ed sm\u011brem ke katod\u011b s ni\u017e\u0161\u00edm nap\u011bt\u00edm. B\u011bhem migrace se spojuj\u00ed s ionty ne\u010distot v lamin\u00e1tu nebo s OH- za vzniku nerozpustn\u00fdch vodiv\u00fdch sol\u00ed, kter\u00e9 se usazuj\u00ed. V d\u016fsledku toho prudce kles\u00e1 elektrick\u00e1 vzd\u00e1lenost mezi ob\u011bma izola\u010dn\u00edmi pr\u016fchodkami. V z\u00e1va\u017en\u00fdch p\u0159\u00edpadech mohou dokonce vytvo\u0159it p\u0159\u00edmou vodivou cestu a zkrat.<\/p>\n\n\n\n<p>Reakce na anod\u011b a katod\u011b (podle pozorov\u00e1n\u00ed):<\/p>\n\n\n\n<p>Anoda:<\/p>\n\n\n\n<p>Cu \u2192 Cu\u00b2\u207a + 2 e-<\/p>\n\n\n\n<p>H\u2082O \u2192 H\u207a + OH-<\/p>\n\n\n\n<p>Katoda:<\/p>\n\n\n\n<p>2 H\u207a + 2 e- \u2192 H\u2082<\/p>\n\n\n\n<p>Cu\u00b2\u207a + 2 OH- \u2192 Cu(OH)\u2082<\/p>\n\n\n\n<p>Cu(OH)\u2082 \u2192 CuO + H\u2082O<\/p>\n\n\n\n<p>CuO + H\u2082O \u2192 Cu(OH)\u2082 \u2192 Cu\u00b2\u207a + 2 OH-<\/p>\n\n\n\n<p>Cu\u00b2\u207a + 2 e- \u2192 Cu<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. Pozn\u00e1mky z na\u0161ich zku\u0161enost\u00ed<\/h2>\n\n\n\n<p>Ne\u017e jsme zjistili, \u017ee p\u0159\u00ed\u010dinou je CAF, zm\u00e1tl n\u00e1s odpor mezi dv\u011bma izolovan\u00fdmi pr\u016fchodkami. Po prohled\u00e1n\u00ed literatury jsme zjistili, \u017ee stejn\u00fdm probl\u00e9mem trp\u011blo mnoho koleg\u016f. CAF se stal pozoruhodn\u00fdm probl\u00e9mem spolehlivosti v pr\u016fmyslu plo\u0161n\u00fdch spoj\u016f.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5. Jak p\u0159edch\u00e1zet nebo omezit CAF<\/h2>\n\n\n\n<p>Zlep\u0161en\u00ed odolnosti lamin\u00e1tu v\u016f\u010di CAF. U procesu v\u00fdroby substr\u00e1tu PCB zvy\u0161te iontovou \u010distotu materi\u00e1lu. Pou\u017e\u00edvejte prysky\u0159ice s n\u00edzkou absorpc\u00ed vlhkosti. Zajist\u011bte, aby sklen\u011bn\u00e1 tkanina byla pln\u011b sm\u00e1\u010dena prysky\u0159ic\u00ed a dob\u0159e se spojovala.<\/p>\n\n\n\n<p>Bu\u010fte opatrn\u00ed p\u0159i vrt\u00e1n\u00ed nebo laserov\u00e1n\u00ed. Vrt\u00e1n\u00ed nebo laser mohou vytv\u00e1\u0159et vysok\u00e9 lok\u00e1ln\u00ed teplo. Pokud teplota p\u0159ekro\u010d\u00ed Tg desky, m\u016f\u017ee se prysky\u0159ice roztavit a vytvo\u0159it zbytky. Zbytky na st\u011bn\u00e1ch otvor\u016f mohou zp\u016fsobit \u0161patn\u00fd kontakt p\u0159i pokovov\u00e1n\u00ed. P\u0159ed pokovov\u00e1n\u00edm proto zbytky odstra\u0148te. Pozn\u00e1mka: nam\u00e1\u010den\u00ed b\u011bhem odstra\u0148ov\u00e1n\u00ed zbytk\u016f m\u016f\u017ee zp\u016fsobit erozi pr\u016fchoz\u00edch otvor\u016f a m\u016f\u017ee zp\u016fsobit kontaminaci m\u011bd\u00ed, co\u017e m\u016f\u017ee usnadnit pozd\u011bj\u0161\u00ed migraci m\u011bdi.<\/p>\n\n\n\n<p>Zv\u011bt\u0161en\u00ed vzd\u00e1lenosti mezi pr\u016fchoz\u00edmi za\u0159\u00edzen\u00edmi v <a href=\"https:\/\/flj-pcb.com\/cs\/pcb-design\/\" data-type=\"page\" data-id=\"3488\">N\u00e1vrh desek plo\u0161n\u00fdch spoj\u016f<\/a>. Tak\u00e9 kan\u00e1ly CAF obvykle sleduj\u00ed stejn\u00fd svazek sklen\u011bn\u00fdch vl\u00e1ken. Odstup\u0148ov\u00e1n\u00ed nebo odsazov\u00e1n\u00ed sousedn\u00edch kan\u00e1l\u016f pom\u00e1h\u00e1 sni\u017eovat riziko CAF.<\/p>\n\n\n\n<p>Vy\u010dist\u011bte povrchy PCBA. Nap\u0159\u00edklad pomoc\u00ed vysokotlak\u00e9 vzduchov\u00e9 pistole odstra\u0148te prach a vyhn\u011bte se zbytk\u016fm ne\u010distot, kter\u00e9 by mohly zp\u016fsobit ne\u017e\u00e1douc\u00ed elektrochemii. Naneste na povrch desky PCBA konformn\u00ed povlak, abyste zabr\u00e1nili vnik\u00e1n\u00ed vlhkosti, zejm\u00e9na v hork\u00e9m a vlhk\u00e9m prost\u0159ed\u00ed.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>1. Recent PCB Leakage Issue Overview We recently faced a PCB leakage issue. The product is low-power. The whole device [&hellip;]<\/p>","protected":false},"author":1,"featured_media":4767,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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