{"id":4641,"date":"2026-01-19T09:23:39","date_gmt":"2026-01-19T09:23:39","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4641"},"modified":"2026-01-19T09:23:44","modified_gmt":"2026-01-19T09:23:44","slug":"fr-4-pcb-guide-properties-limits-material-choices","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/bs\/fr-4-pcb-guide-properties-limits-material-choices\/","title":{"rendered":"Vodi\u010d za FR-4 PCB: svojstva, ograni\u010denja i izbori materijala"},"content":{"rendered":"<h2 class=\"wp-block-heading\">fr4 \u2014 definicija i zna\u010denje<\/h2>\n\n\n\n<p>fr4 je oznaka za plamenootpornost stakloplasti\u010dnog laminata oja\u010danog staklenim vlaknima, oblo\u017eenog bakrom i epoksidnom smolom. To zna\u010di da smola mora sama prestati gorjeti nakon \u0161to se zapali. fr4 nije naziv nekog specifi\u010dnog materijala. To je klasa materijala koja se koristi za tiskane plo\u010dice (PCB).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">sastav i uobi\u010dajene vrste<\/h2>\n\n\n\n<p>Postoji mnogo vrsta FR4 materijala koji se koriste u obi\u010dnim PCB-ovima. Ve\u0107ina su kompozitni materijali napravljeni od takozvane tetrafunkcionalne epoksidne smole, punila i staklenih vlakana.<\/p>\n\n\n\n<p>Primjer: ako specifikacija PCB-a glasi <strong>fr4 T:1.0 D\/S<\/strong>, to zna\u010di: FR4 klasa otpornosti na plamen, T:1.0 zna\u010di debljinu 1,0 mm, D\/S zna\u010di dvostrana obrada. Drugim rije\u010dima, materijal plo\u010de je dvostrani laminat od epoksidne staklene tkanine s bakrenim slojevima, debljine 1,0 mm.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">fr4 \u2014 klju\u010dna svojstva i klasifikacije<\/h2>\n\n\n\n<p>Tehni\u010dki, FR4 laminati imaju skup klju\u010dnih specifikacija. One uklju\u010duju:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>fleksuralna \u010dvrsto\u0107a i \u010dvrsto\u0107a pri lju\u0161tenju, i otpornost na toplotni \u0161ok;<\/li>\n\n\n\n<li>izra\u017eena otpornost na plamen;<\/li>\n\n\n\n<li>volumski otpor i povr\u0161inski otpor;<\/li>\n\n\n\n<li>dielektri\u010dna konstanta (Dk) i faktor disipacije (tangens gubitka);<\/li>\n\n\n\n<li>temperatura staklenog prijelaza (Tg);<\/li>\n\n\n\n<li>dimenzionalna stabilnost, maksimalna radna temperatura i izobli\u010denje.<\/li>\n<\/ul>\n\n\n\n<p>Ove osobine zajedno definiraju performanse FR4 pri izradi tiskanih plo\u010dica.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ostali uobi\u010dajeni osnovni materijali za PCB<\/h2>\n\n\n\n<p>\u25c9 Staklena plo\u010da na bazi stakloplastike<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Staklena platnena plo\u010da: FR4 i FR5<br>Oba koriste posebnu elektroni\u010dku tkaninu natopljenu epoksidnom (ili epoksidno-fenolnom) smolom. Zatim se o\u010dvr\u0161\u0107uju pod visokom temperaturom i pritiskom. FR4 je naj\u010de\u0161\u0107e kori\u0161tena plo\u010da u izradi tiskanih plo\u010dica. Ima dobre elektri\u010dne osobine, dobru mehani\u010dku \u010dvrsto\u0107u i otpornost na toplinu. \u0160iroko se koristi u proizvodnji vi\u0161eslojnih tiskanih plo\u010dica.<\/li>\n<\/ol>\n\n\n\n<p>\u25c9 Papirne plo\u010de<br>2. Papirni kartoni: fr-1, fr-2, fr-3<br>Fenolne papirne plo\u010de koriste fenolnu smolu kao vezivo i tkaninu od vlakana drvene pulpe kao povr\u0161insko oja\u010danje. Proizvode se pri visokim temperaturama i pritiscima.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards.webp\" alt=\"Paper based boards\" class=\"wp-image-4642\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards-300x169.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards-768x432.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards-18x10.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>\u25c9 Kompozitne plo\u010de<br>3. Kompozitne plo\u010de: CEM-1 i CEM-3<br>Kompozitne plo\u010de uklju\u010duju CEM seriju laminata oblo\u017eenih bakrom. CEM-1 koristi epoksidni papir kao jezgro. CEM-3 koristi epoksidnu staklenu netkanu tkaninu kao jezgro. Ove CEM plo\u010de su lake za obradu. Imaju dobru ravnost, dimenzionalnu stabilnost i preciznu debljinu. Njihova mehani\u010dka \u010dvrsto\u0107a, dielektri\u010dna svojstva, apsorpcija vode i otpornost na migraciju metala su bolji od papirnih plo\u010da. Va\u017eno je napomenuti da CEM-3 mo\u017ee dosti\u0107i oko 80% mehani\u010dke \u010dvrsto\u0107e fr4, ali obi\u010dno je jeftiniji.<\/p>\n\n\n\n<p>\u25c9 Specijalne materijalne plo\u010de<br>4. Posebni odbori (na primjer, <a href=\"https:\/\/flj-pcb.com\/bs\/pcb-manufacturer\/ceramic-pcb\/\" data-type=\"page\" data-id=\"2364\">keramika i metal<\/a>)<br>To uklju\u010duje kerami\u010dke podloge i plo\u010de s metalnom jezgrom. Imaju posebna svojstva za primjene koje zahtijevaju bolje performanse materijala.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"500\" height=\"469\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/ceramic-pcb.webp\" alt=\"ceramic pcb\" class=\"wp-image-4643\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/ceramic-pcb.webp 500w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/ceramic-pcb-300x281.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/ceramic-pcb-13x12.webp 13w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">prednosti i ograni\u010denja FR4<\/h2>\n\n\n\n<p>Otkako sam po\u010deo dizajnirati PCB-ove, FR4 je standardni materijal za plo\u010de. U po\u010detku su neki dizajneri svaku plo\u010du nazivali \u201cfr4\u201d, bez obzira na to da li je bila ili nije. FR4 je vatrootporni, tip-4 epoksidni laminat oja\u010dan staklenim vlaknima. Iznimno je isplativ. Dobar je elektri\u010dni izolator. Izdr\u017eljiv je i u suhim i u vla\u017enim uvjetima. Tako\u0111er je lako oblikovati u plo\u010de. Iz tih razloga FR4 je \u010dest izbor za izradu tiskanih plo\u010dica.<\/p>\n\n\n\n<p>FR4 ima ograni\u010denja. Mo\u017ee nai\u0107i na probleme kada je u pitanju previ\u0161e snage, napona ili toplote. Ako ga natjerate da radi izvan svojih granica, njegova dielektri\u010dna svojstva \u0107e se pogor\u0161ati. To zna\u010di da \u0107e materijal izgubiti izolaciju i po\u010deti provoditi. Jo\u0161 jedan problem je odr\u017eavanje stabilne impedanse u visokobrzim dizajnima. Dielektri\u010dna konstanta fr4-a mo\u017ee varirati du\u017e du\u017eine i \u0161irine plo\u010de. Kako se brzine dizajna pove\u0107avaju, gubici signala koji su bili prihvatljivi na niskobrzim plo\u010dama mogu postati preveliki na fr4 plo\u010dama.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Da li je FR4 najbolji izbor za dizajn visokobrzinskih \u0161tampanih plo\u010dica?<\/h2>\n\n\n\n<p>Kada preuzmemo projekat izvan na\u0161e zone komfora, u\u010dimo nove granice. Za mene je taj dan do\u0161ao kada je moj \u0161ef zatra\u017eio za <a href=\"https:\/\/flj-pcb.com\/bs\/pcb-manufacturer\/high-speed-pcb\/\" data-type=\"page\" data-id=\"2370\">brzi brod<\/a>. Znao sam da dizajn za velike brzine donosi ograni\u010denja koja ne vidimo u obi\u010dnim sklopovima. Prvo sam prilagodio shemu za rad na velikim brzinama. Zatim sam se fokusirao na to treba li visokobrzinski prototip koristiti FR4 ili neki specijaliziraniji materijal. Prije dono\u0161enja odluke, imajte na umu da ovaj tekst koristi \u201cvisoka brzina\u201d za sve \u0161to je iznad <strong>50 MHz<\/strong>. Ovo su materijalne brige u tom frekvencijskom rasponu.<\/p>\n\n\n\n<p>Visokobrzinski dizajni imaju stro\u017ea pravila za integritet signala. Morate pa\u017eljivo kontrolisati rute kako biste ispunili ta pravila. Ali sam materijal plo\u010de je dio jedna\u010dine integriteta signala. Stoga materijal za visokobrzinske plo\u010de treba imati usku toleranciju Dk i druga kontrolisana svojstva koja poma\u017eu u kontroli impedanse. Ako se impedansa mijenja u okviru dizajna, visokobrzinski signali \u0107e reflektovati energiju dok putuju i signal \u0107e se iskriviti. Tako\u0111er, niski tangens gubitka poma\u017ee da signal ostane sna\u017ean. Kona\u010dno, toplotna stabilnost poma\u017ee osigurati da se dielektri\u010dna svojstva ne naru\u0161e.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Kako se specijalizovani materijali visoke brzine uspore\u0111uju sa FR4<\/h2>\n\n\n\n<p>Specijalni visokobrzinski materijali, poput termosetnih hidrokarbonskih laminata i PTFE laminata, \u010desto pru\u017eaju bolje i pouzdanije performanse u dizajnima visokih frekvencija nego FR4. Ispod su neke od klju\u010dnih prednosti ovih materijala:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"525\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/high-speed-pcb.webp\" alt=\"high-speed pcb\" class=\"wp-image-4645\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/high-speed-pcb.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/high-speed-pcb-300x225.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/high-speed-pcb-16x12.webp 16w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Smanjen gubitak signala.<\/strong> Kako frekvencija prenosne linije raste, gubici signala rastu. Visokobrzinski laminati imaju mnogo ni\u017ei tangens gubitka od FR4. Neki materijali, poput gotovo \u010distih PTFE laminata, su za red veli\u010dine bolji. Ni\u017ei tangens gubitka je klju\u010dni faktor u smanjenju gubitka signala.<\/li>\n\n\n\n<li><strong>O\u0161trija kontrola impedanse.<\/strong> Tradicionalni materijali poput FR4 ne mogu odr\u017eavati dielektri\u010dni koeficijent (Dk) tako precizno kao materijali za visoke brzine. Dk kod FR4 mo\u017ee varirati za \u00b110% ili vi\u0161e. Materijali poput PTFE-a mogu odr\u017eavati Dk unutar otprilike \u00b12% ili bolje.<\/li>\n\n\n\n<li><strong>Bolje upravljanje toplinom.<\/strong> Neki laminati visoke brzine (na primjer termosetni hidrokarbonski laminati) imaju mnogo bolju toplotnu provodljivost od FR4. Ako va\u0161 dizajn treba upravljati toplotom, vrijedi prou\u010diti ove laminate.<\/li>\n\n\n\n<li><strong>Manje upijanje vlage.<\/strong> Voda ima dielektri\u010dne efekte. \u010cak i mala koli\u010dina vlage u tiskanom plo\u010du (PCB) mo\u017ee promijeniti elektri\u010dne performanse visokofrekventnih kola. Iako tekst navodi da je apsorpcija vlage kod FR4 blizu 50%, neki visokobrzinski materijali (na primjer neki PTFE laminati) mogu imati znatno ni\u017eu apsorpciju vlage, oko 2%, \u0161to poma\u017ee odr\u017eavanju stabilnog elektri\u010dnog pona\u0161anja.<\/li>\n\n\n\n<li><strong>Ve\u0107a dimenzionalna stabilnost.<\/strong> Gusti, visokobrzinski rasporedi zahtijevaju strogu dimenzionalnu kontrolu. FR4 je poznat po dobroj dimenzionalnoj stabilnosti, ali neki visokobrzinski materijali nude bolje ukupne performanse za dizajne sa strogim tolerancijama. U takvim slu\u010dajevima termostabilni hidrokarbonski laminati mogu biti bolji izbor.<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"<p>fr4 \u2014 definition and meaning fr4 is the code for the flame-retardant rating of a glass-fiber reinforced epoxy copper clad 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