{"id":4688,"date":"2026-01-28T07:05:56","date_gmt":"2026-01-28T07:05:56","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4688"},"modified":"2026-01-28T07:05:59","modified_gmt":"2026-01-28T07:05:59","slug":"make-your-pcb-more-reliable-with-vias","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/bs\/make-your-pcb-more-reliable-with-vias\/","title":{"rendered":"U\u010dinite svoj PCB pouzdanijim pomo\u0107u via-rupa."},"content":{"rendered":"<p>Proizvo\u0111a\u010di elektronike koriste <a href=\"https:\/\/flj-pcb.com\/bs\/what-considerations-to-make-multi-layer-pcbs\/\" data-type=\"post\" data-id=\"4209\">Vi\u0161eslojne tiskane plo\u010dice<\/a> (PCB-ovi) kako bi krugovi zauzimali manje prostora. To im omogu\u0107ava da postave vi\u0161e dijelova na gornju stranu plo\u010de, a tako\u0111er ostavlja prostor za provo\u0111enje tragova na unutra\u0161njim slojevima. Vije su jedini na\u010din za uspostavljanje elektri\u010dnih veza izme\u0111u razli\u010ditih slojeva. Vije su klju\u010dni dio dizajna plo\u010de, a tako\u0111er mijenjaju na\u010din lemljenja i mogu dodati slabe ta\u010dke. Te slabe ta\u010dke mogu smanjiti pouzdanost cijele plo\u010de. Ali ako dizajneri prate dobra pravila dizajna, mogu koristiti vias i i dalje napraviti pouzdanu \u0161tampanu plo\u010dicu.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0160ta je via?<\/h2>\n\n\n\n<p>Via je otvor u tiskanoj plo\u010dici (PCB) koji prolazi kroz jedan ili vi\u0161e slojeva. Proizvo\u0111a\u010d oblo\u017ei otvor bakrom kako bi formirao cilindar. Krajevi cilindra povezuju se s odre\u0111enim tragovima na slojevima. To omogu\u0107ava elektri\u010dni kontakt izme\u0111u dva sloja. Ako via prolazi kroz nekoliko unutra\u0161njih slojeva, ti slojevi se tako\u0111er mogu povezati s viom kad god to krug zahtijeva.<\/p>\n\n\n\n<p>Postoje tri glavne vrste prolaza: prolazi od po\u010detka do kraja, zakopani prolazi i slijepi prolazi.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Prohodne rupe prolaze kroz punu debljinu plo\u010de. Po\u010dinju na gornjem sloju i zavr\u0161avaju na donjem sloju. Proizvo\u0111a\u010di mogu oblo\u017eiti ili ne oblo\u017eiti prohodne rupe prema potrebi. Kada to krug zahtijeva, oblo\u017eena prohodna rupa omogu\u0107ava povezivanje drugih unutra\u0161njih slojeva s njom.<\/li>\n\n\n\n<li>Ugra\u0111ene vias prelaze preko dva ili vi\u0161e unutra\u0161njih slojeva. Nisu vidljive ni na gornjoj ni na donjoj strani. Kada to krug zahtijeva, slojevi koje ugra\u0111ena via povezuje mogu se spojiti na nju.<\/li>\n\n\n\n<li>Slijepe vijase po\u010dinju na gornjem ili donjem sloju i zavr\u0161avaju na unutra\u0161njem sloju. Usput mogu prelaziti preko nekoliko unutra\u0161njih slojeva i po potrebi se s njima povezati.<\/li>\n<\/ul>\n\n\n\n<p>HDI PCB-ovi i fleksibilni PCB-ovi koriste drugi tip vijice nazvan mikrovijice. Mikrovijice su vrlo male. Proizvo\u0111a\u010di ih bu\u0161e laserom. Svaka mikrovijica obi\u010dno prolazi kroz samo jedan sloj. Proizvo\u0111a\u010di mogu slo\u017eiti mikrovijice jedna na drugu kako bi djelovale kao prolazne, slijepe ili zakopane vijice.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"466\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/What-a-via-is.webp\" alt=\"\" class=\"wp-image-4689\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/What-a-via-is.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/What-a-via-is-300x175.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/What-a-via-is-768x447.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/What-a-via-is-18x10.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Putem veli\u010dine<\/h2>\n\n\n\n<p>Via postaje ja\u010da i provodljivija kada je njen promjer ve\u0107i. Ve\u0107e viae imaju ve\u0107u mehani\u010dku \u010dvrsto\u0107u. Tako\u0111er provode vi\u0161e struje i bolje odvode toplinu. Me\u0111utim, kori\u0161tenje velikih viaea smanjuje slobodnu povr\u0161inu na plo\u010di. To mo\u017ee ote\u017eati usmjeravanje tragova kada je prostor ograni\u010den.<\/p>\n\n\n\n<p>Uobi\u010dajeno prakti\u010dno pravilo je koristiti minimalni promjer bu\u0161enja od 20 mil, prstenasti prsten od 7 mil i maksimalni omjer stranica 6:1. Ovdje je omjer stranica debljina plo\u010de podijeljena promjerom rupe. Ako se dr\u017eite ovih vrijednosti, via \u0107e biti lak\u0161a za izradu i pouzdanija za mnoge primjene.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Toplinska i mehani\u010dka napetost<\/h2>\n\n\n\n<p>Kada se PCB zagrije tokom obrade ili upotrebe, razlike u koeficijentu toplinske ekspanzije (CTE) izme\u0111u bakra i laminata mogu stvoriti naprezanje. Struktura laminata u PCB-u ograni\u010dava \u0161irenje u ravnini plo\u010de, ali se plo\u010da mo\u017ee slobodnije skupljati ili \u0161iriti kroz debljinu. To zna\u010di da se u vertikalnom smjeru mo\u017ee dogoditi ve\u0107a promjena.<\/p>\n\n\n\n<p>Na primjer, FR4 laminat se \u0161iri ili skuplja otprilike \u010detiri puta br\u017ee od bakra. Dakle, svaki put kada se plo\u010da zagrije, bakrena cijev u via osje\u0107a veliki napon. Ako bakrena cijev nije dovoljno debela, a PCB je debeo, plo\u010da se mo\u017ee \u0161iriti dok ne razbije bakar. Za bu\u0161ilicu od 20 mil, promjer pad-a od 34 mil je dobar. Sa ovim pad-om i dobrom debljinom cijevi, maksimalna debljina plo\u010de od 120 mil je razumna praksa za pouzdanost.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Usisavanje kalaja i njegovi efekti<\/h2>\n\n\n\n<p>Gdje postavite via je jednako va\u017eno kao i njena veli\u010dina. Postavljanje via preblizu padu mo\u017ee uzrokovati probleme sa lemom. Glavni problem je usisavanje lemova.<\/p>\n\n\n\n<p>Kada zagrijete pastu za lemljenje na via i pad, kapilarna akcija uvla\u010di kalaj s pada u cijev via. Kalaj prolazi kroz via i nakuplja se na dnu. Time pad ostaje s premalo kalaja ili bez njega. Ve\u0107i via \u0107e uvla\u010diti kalaj br\u017ee i u ve\u0107oj koli\u010dini. Spoj s premalo kalaja mo\u017ee biti mehani\u010dki slab i imati ve\u0107u elektri\u010dnu otpornost.<\/p>\n\n\n\n<p>Evo tri uobi\u010dajena na\u010dina za zaustavljanje upijanja kalaja. Svaki od njih mo\u017ee dobro funkcionirati.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Brana za lemnu masku:<br>Postavite sloj maske za lemljenje izme\u0111u via-e i pad-a. Maska djeluje kao barijera i sprje\u010dava ulazak kalaja u via-u. Da bi se postavio dovoljno \u0161irok prsten maske, dizajneri mo\u017eda moraju pomjeriti via-u dalje od pad-a. Ako je plo\u010da ve\u0107 gusto popunjena ili prenosi visokofrekventne signale, mo\u017eda ne\u0107e biti mogu\u0107e pomjeriti via-u.<\/li>\n\n\n\n<li>\u0160atorisanje na putu:<br>Ako ne mo\u017eete premjestiti via ili dodati masku za brtvljenje, mo\u017eete postaviti \u0161ator na via. \u0160atoriranje zna\u010di prekrivanje via slojem maske za lemljenje tako da je vrh via potpuno zape\u010da\u0107en. Potpuno brtvljenje via mo\u017ee sprije\u010diti protok kalaja u njega. Me\u0111utim, to tako\u0111er sprje\u010dava da se via koristi kao testna ta\u010dka. Tako\u0111er, s vremenom ne\u010disto\u0107e mogu dospjeti u \u0161atoriranu via i korodirati bakrenu cijev ako \u0161ator nije savr\u0161en.<\/li>\n\n\n\n<li>Popunjavanje via:<br>Mo\u017eete potpuno napuniti via prije nego \u0161to na njega postavite komponente. Popunjavanje mo\u017ee biti provodljivo ili nevodljivo. Potpuno zape\u010da\u0107ena ispunjena via pru\u017ea bolju barijeru protiv ne\u010disto\u0107a. Popunjavanje tako\u0111er smanjuje rizik od upijanja kalaja (solder wicking) tijekom sklapanja. Ispunjene vias su uobi\u010dajene kada je potrebna ravna povr\u0161ina za sklapanje, na primjer ispod BGA, ili kada su potrebne bolje toplinske ili mehani\u010dke performanse.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Kada koristiti svaku metodu<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Koristite barijeru maske za lemljenje kad god mo\u017eete pomjeriti viju malo i kad na plo\u010di ima mjesta. Ovo je jeftino rje\u0161enje koje radi na mnogim plo\u010dama.<\/li>\n\n\n\n<li>Koristite tenting kada je prostor ograni\u010den i mo\u017eete prihvatiti da via nije testna ta\u010dka. Tenting je jeftiniji od popunjavanja, ali ima ograni\u010denja u dugoro\u010dnoj za\u0161titi od vlage i kontaminacije.<\/li>\n\n\n\n<li>Koristite popunjene via-e kada vam je potreban najbolji rezultat. Popunjene via-e su skuplje, ali pru\u017eaju ravan vrh za monta\u017eu i sprje\u010davaju prodor kalaja i ne\u010disto\u0107a. Ako izra\u0111ujete mnogo plo\u010da ili ako plo\u010da mora dugo izdr\u017eati u te\u0161kim uvjetima, popunjavanje je dobar izbor.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Ostali faktori pouzdanosti<\/h2>\n\n\n\n<p>Viae tako\u0111er mogu utjecati na druge dijelove dizajna. Na primjer, mogu promijeniti toplotne putove i stvoriti to\u010dke u kojima se koncentrira naprezanje. Kada je via blizu toplotnog otpu\u0161tanja ili izvora topline, mijenja se na\u010din na koji toplina struji kroz plo\u010du. To mo\u017ee utjecati na vijek trajanja komponenti i promijeniti u\u010dinkovitost hla\u0111enja dijela.<\/p>\n\n\n\n<p>Vije u blizini traka visokih brzina ili RF traka tako\u0111er mogu uzrokovati promjene impedanse. Vija\u010dni cilindar i pad vije dodaju kapacitivnost i indukativnost. Dizajneri moraju provjeriti integritet signala kada su vije na kriti\u010dnim putevima.<a href=\"https:\/\/flj-pcb.com\/bs\/step-by-step-hdi-pcb-blind-and-buried-via-process\/\" data-type=\"post\" data-id=\"4673\"> HDI<\/a> i mikrovia poma\u017eu ovdje jer su male i imaju manji utjecaj na signale visoke brzine kada su pravilno postavljene.<\/p>\n\n\n\n<p>Kada projektujete plo\u010du za proizvod koji \u0107e do\u017eivjeti mnogo toplotnih ciklusa ili za proizvod koji mora pro\u0107i stroge testove pouzdanosti, planirajte kako \u0107e se via-veze pona\u0161ati tokom vremena. Koristite deblju barrel plating gdje god mo\u017eete. U HDI dizajnima koristite slo\u017eene ili pomaknute mikrovia-veze kako biste smanjili naprezanje na jednoj barrel-vezi. Koristite odgovaraju\u0107e veli\u010dine padova kako plo\u010da ne bi preoptere\u0107ivala bakar tokom reflow-a ili toplotnih ciklusa.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Za HDI i fleksibilne plo\u010de<\/h2>\n\n\n\n<p>HDI plo\u010de i <a href=\"https:\/\/flj-pcb.com\/bs\/pcb-manufacturer\/flexible-pcb\/\" data-type=\"page\" data-id=\"1901\">fleksibilne \u0161tampane plo\u010dice<\/a> Koristite mikrovije \u010desto. Mikrovije su male i imaju nisku indukanciju. To poma\u017ee pri visokim brzinama i gustim rasporedima. Svaka mikrovija obi\u010dno dose\u017ee samo jedan unutra\u0161nji sloj. Proizvo\u0111a\u010di koriste lasersko bu\u0161enje da bi ih napravili. Mogu slo\u017eiti mikrovije kako bi povezali nekoliko slojeva na malom prostoru. Slo\u017eene mikrovije pona\u0161aju se poput slijepih ili zakopanih vijki kada ih slo\u017eite, i mogu pomo\u0107i da prostor za rute ostane otvoren na drugim slojevima.<\/p>\n\n\n\n<p>Za fleksibilne plo\u010de, mehani\u010dko savijanje u blizini vias mo\u017ee o\u0161tetiti barrel ako via nije pravilno postavljena. U fleksibilnim podru\u010djima nastojte dr\u017eati vias podalje od glavnih linija savijanja. Koristite posebne dizajne vias i obradu materijala kako biste smanjili rizik od pucanja pri savijanju plo\u010de.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Prakti\u010dna pravila i primjeri<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Minimalni promjer bu\u0161enja: 20 mil. Ovo je uobi\u010dajeni minimum za standardnu proizvodnju. Manje promjere bu\u0161enja zahtijevaju posebne procese i skuplje su.<\/li>\n\n\n\n<li>Prstenasti prsten: 7 mil. Ovo osigurava dovoljno bakra oko rupe za pouzdanu vezu i lemljenje.<\/li>\n\n\n\n<li>Omjer stranica: ograni\u010denje na 6:1. Ovo odr\u017eava kvalitetu pozlatnog sloja visokom. Ako je plo\u010da deblja od preporu\u010dene vrijednosti za veli\u010dinu rupe, pozlatni sloj u cijevi mo\u017ee biti tanak i mo\u017ee otkazati.<\/li>\n\n\n\n<li>Primjer: ako je bu\u0161ilica 20 mil, koristite promjer podloge od oko 34 mil. To osigurava dovoljno prstenastog prostora. Za plo\u010du debljine do 120 mil ova kombinacija je primjenjiva u mnogim tvornicama.<\/li>\n<\/ul>\n\n\n\n<p>Koristite ova pravila kao polaznu osnovu. Svaka tvornica mo\u017ee imati ne\u0161to druga\u010dije granice. Rano razgovarajte sa svojim proizvo\u0111a\u010dem plo\u010da kako biste prilagodili dizajnerske odluke onome \u0161to oni mogu pouzdano izvesti.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Razmatranja pri sklapanju i testiranju<\/h2>\n\n\n\n<p>Ako koristite tenting ili popunjavanje, razmislite o testiranju. Tentirane viase ne mogu slu\u017eiti kao sondne ta\u010dke. Popunjene viase koje su presvu\u010dene plo\u010dom i dalje mogu biti testirane ako se popunjavanje i gornja plo\u010dica pravilno obra\u0111uju tokom proizvodnje. Ako je testiranje va\u017eno, planirajte testne padove, testne viase ili druge strategije testiranja koje odgovaraju va\u0161em procesu sklapanja.<\/p>\n\n\n\n<p>Kada postavite via blizu lemne plo\u010dice, planirajte proces lemljenja. Ako koristite mnogo via ispod velikog BGA, razmislite o ispunjavanju i pozlatnom presvla\u010denju via te o tome da BGA land bude na ravnoj povr\u0161ini. To smanjuje rizik od rupa u lemu i poma\u017ee pri toplinskoj raspodjeli.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u010cisto\u0107a i korozija<\/h2>\n\n\n\n<p>Viae mogu zadr\u017eati magnetni tok, vlagu i druge ne\u010disto\u0107e. To je jo\u0161 gore kada imate tentirane viae koje nisu savr\u0161ene ili kada se oslanjate na viae kao toplotne puteve koji tokom toplotnih ciklusa prenose vlagu unutra i van. Koristite temeljito \u010di\u0161\u0107enje nakon sklapanja kada dizajn to zahtijeva. Koristite pouzdane materijale i zavr\u0161ne obrade koje otporuju koroziji u o\u010dekivanom okru\u017eenju. Ispunjene viae ovdje poma\u017eu jer sprje\u010davaju ulazak ne\u010disto\u0107a.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Zaklju\u010dak<\/h2>\n\n\n\n<p>Vije su neophodne za vi\u0161eslojne tiskane plo\u010dice. Omogu\u0107avaju postavljanje vi\u0161e komponenti i usmjeravanje slo\u017eenih mre\u017ea. Me\u0111utim, vije tako\u0111er mijenjaju pona\u0161anje kalaja i stvaraju ta\u010dke mehani\u010dkog i toplotnog naprezanja. Ove rizike mo\u017eete smanjiti dobrim pravilima dizajna i pravim odabirima na samom po\u010detku projekta.<\/p>\n\n\n\n<p>Dizajneri bi trebali rano prou\u010diti pouzdanost. Studija pouzdanosti pove\u0107ava \u0161anse za uspjeh, smanjuje tro\u0161kove tokom \u017eivotnog vijeka proizvoda, skra\u0107uje vrijeme izlaska na tr\u017ei\u0161te i pobolj\u0161ava zadovoljstvo kupaca. Za dobar dizajn pouzdanosti potrebni su vam pravi ljudi, pravi alati i dovoljno vremena. Planirajte viae u pogledu tipova, veli\u010dina, pozicioniranja i obrade sa svojim proizvo\u0111a\u010dem i pogonom za sklapanje. Koristite brane za lemnu masku, prekrivanje (tenting) ili punjenje viaa tamo gdje je svaka metoda primjenjiva. Koristite mikrovia za HDI i fleksibilne dizajne kada to poma\u017ee.<\/p>","protected":false},"excerpt":{"rendered":"<p>Electronics makers use multilayer printed circuit boards (PCBs) to make circuits take less space. This lets them put more parts 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