{"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\/da\/make-your-pcb-more-reliable-with-vias\/","title":{"rendered":"G\u00f8r dit printkort mere p\u00e5lideligt med vias"},"content":{"rendered":"<p>Elektronikproducenter bruger <a href=\"https:\/\/flj-pcb.com\/da\/what-considerations-to-make-multi-layer-pcbs\/\" data-type=\"post\" data-id=\"4209\">Flerlags printplader<\/a> (PCB'er) for at f\u00e5 kredsl\u00f8b til at fylde mindre. Det giver dem mulighed for at placere flere dele p\u00e5 oversiden af printet, og det giver ogs\u00e5 plads til at k\u00f8re spor p\u00e5 de indre lag. Vias er den eneste m\u00e5de at lave elektriske forbindelser mellem forskellige lag. Vias er en vigtig del af printdesignet, og de \u00e6ndrer ogs\u00e5, hvordan lodning fungerer, og kan tilf\u00f8je svage punkter. Disse svage punkter kan s\u00e6nke hele printets p\u00e5lidelighed. Men hvis designerne f\u00f8lger gode designregler, kan de bruge vias og stadig lave et p\u00e5lideligt printkort.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hvad en via er?<\/h2>\n\n\n\n<p>En via er et hul i et printkort, der g\u00e5r gennem et eller flere lag. Producenten bekl\u00e6der hullet med kobber, s\u00e5 der dannes en t\u00f8nde. Enderne af t\u00f8nden forbindes med specifikke spor p\u00e5 lagene. P\u00e5 den m\u00e5de skabes der elektrisk kontakt mellem to lag. Hvis en via krydser flere indre lag, kan de indre lag ogs\u00e5 forbindes til via'en, n\u00e5r kredsl\u00f8bet har brug for det.<\/p>\n\n\n\n<p>Der er tre hovedtyper af vias: gennemg\u00e5ende vias, nedgravede vias og blinde vias.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Gennemg\u00e5ende vias g\u00e5r gennem hele pladetykkelsen. De starter i det \u00f8verste lag og slutter i det nederste lag. Producenter kan plotte eller ikke plotte gennemg\u00e5ende vias efter behov. N\u00e5r et kredsl\u00f8b har brug for det, lader en plated through via andre indre lag forbinde sig til det.<\/li>\n\n\n\n<li>Nedgravede vias krydser to eller flere indre lag. De er ikke synlige p\u00e5 toppen eller bunden. N\u00e5r kredsl\u00f8bet har brug for det, kan lagene, som en nedgravet via sp\u00e6nder over, forbindes til det.<\/li>\n\n\n\n<li>Blinde vias starter i det \u00f8verste eller nederste lag og slutter i et indre lag. Undervejs kan de krydse flere indre lag og kan forbindes til dem, n\u00e5r det er n\u00f8dvendigt.<\/li>\n<\/ul>\n\n\n\n<p>High density interconnect (HDI) PCB'er og fleksible PCB'er bruger en anden via-type kaldet microvias. Microvias er meget sm\u00e5. Producenterne borer dem med en laser. Hver microvia g\u00e5r normalt kun gennem \u00e9t lag. Producenterne kan stable microvias oven p\u00e5 hinanden, s\u00e5 de fungerer som gennemg\u00e5ende, blinde eller nedgravede vias.<\/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\">Via st\u00f8rrelse<\/h2>\n\n\n\n<p>En via bliver st\u00e6rkere og mere ledende, n\u00e5r dens diameter er st\u00f8rre. St\u00f8rre vias har h\u00f8jere mekanisk styrke. De f\u00f8rer ogs\u00e5 mere str\u00f8m og flytter varmen bedre. Men brugen af store vias reducerer det frie areal p\u00e5 printet. Det kan g\u00f8re routing sv\u00e6rere, n\u00e5r pladsen er trang.<\/p>\n\n\n\n<p>En almindelig praktisk regel er at bruge en mindste borest\u00f8rrelse p\u00e5 20 mil, en ringformet ring p\u00e5 7 mil og et maksimalt st\u00f8rrelsesforhold p\u00e5 6:1. Her er st\u00f8rrelsesforholdet pladetykkelsen divideret med hullets diameter. Hvis du holder dig inden for disse v\u00e6rdier, bliver via'en lettere at lave og mere p\u00e5lidelig til mange form\u00e5l.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Varme og mekanisk belastning<\/h2>\n\n\n\n<p>N\u00e5r et printkort opvarmes under bearbejdning eller brug, kan forskelle i varmeudvidelseskoefficienten (CTE) mellem kobber og laminatet skabe sp\u00e6ndinger. Laminatstrukturen i printet begr\u00e6nser udvidelsen i printets plan, men printet kan krympe eller vokse mere frit gennem tykkelsen. Det betyder, at der kan ske flere \u00e6ndringer i den lodrette retning.<\/p>\n\n\n\n<p>For eksempel udvider eller krymper et fr4-laminat cirka fire gange s\u00e5 hurtigt som kobber. S\u00e5 hver gang printet opvarmes, uds\u00e6ttes kobberr\u00f8ret i via'en for en masse stress. Hvis kobberr\u00f8ret ikke er tykt nok, og hvis printet er tykt, kan printet udvide sig, indtil det kn\u00e6kker kobberet. Til et 20 mil-bor fungerer en 34 mil-paddiameter godt. Med denne pad og en god cylindertykkelse er en maksimal pladetykkelse p\u00e5 120 mil en rimelig praksis for p\u00e5lidelighed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Loddetr\u00e5de og deres virkninger<\/h2>\n\n\n\n<p>Hvor du s\u00e6tter en via, betyder lige s\u00e5 meget som dens st\u00f8rrelse. Hvis man s\u00e6tter en via for t\u00e6t p\u00e5 en pad, kan det give loddeproblemer. Det st\u00f8rste problem er loddetinnet.<\/p>\n\n\n\n<p>N\u00e5r du opvarmer loddepasta p\u00e5 en via og en pad, tr\u00e6kker kapill\u00e6rvirkningen loddetinnet fra pad'en ind i viaen. Loddet bev\u00e6ger sig gennem via'en og samler sig i bunden. Det efterlader paden med for lidt eller slet intet loddetin. En st\u00f8rre via vil suge loddetinnet hurtigere og mere af det. En samling med for lidt loddemetal kan v\u00e6re mekanisk svag og have h\u00f8jere elektrisk modstand.<\/p>\n\n\n\n<p>Her er tre almindelige m\u00e5der at stoppe loddetinnet p\u00e5. Hver m\u00e5de kan fungere godt.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Loddemaskens d\u00e6mning:<br>L\u00e6g et lag loddemaske mellem viaen og puden. Masken fungerer som en barriere og holder loddetinnet ude af via'en. For at f\u00e5 plads til en maske, der er bred nok, kan det v\u00e6re n\u00f8dvendigt at flytte via'en l\u00e6ngere v\u00e6k fra pad'en. Hvis printet allerede er t\u00e6t, eller hvis printet b\u00e6rer h\u00f8jfrekvente signaler, er det m\u00e5ske ikke muligt at flytte via'en.<\/li>\n\n\n\n<li>Teltning af via:<br>Hvis du ikke kan flytte via'en eller tilf\u00f8je en masked\u00e6mning, kan du tappe via'en. Teltning betyder at d\u00e6kke via'en med loddemaske, s\u00e5 via'ens top er helt forseglet. Hvis man forsegler en via helt, kan man forhindre loddetinnet i at flyde ind i den. Men det forhindrer ogs\u00e5 via'en i at blive brugt som testpunkt. Desuden kan forurenende stoffer tr\u00e6nge ind i en via med telt over tid og korrodere kobberr\u00f8ret, hvis teltet ikke er perfekt.<\/li>\n\n\n\n<li>Fylder via'en:<br>Du kan fylde en via helt op, f\u00f8r du pletterer over den. Fyldet kan v\u00e6re ledende eller ikke-ledende. En fyldt via, der er helt forseglet, giver en bedre barriere mod forurening. Fyldning reducerer ogs\u00e5 risikoen for, at loddetinnet siver ud under monteringen. Fyldte vias er almindelige, n\u00e5r man har brug for en flad overflade til montering, f.eks. under BGA'er, eller n\u00e5r man har brug for bedre termisk eller mekanisk ydeevne.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Hvorn\u00e5r skal man bruge hver metode?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Brug en loddemaskedam, n\u00e5r du kan flytte via'en en smule, og der er plads p\u00e5 printet. Det er en billig l\u00f8sning, som virker p\u00e5 mange print.<\/li>\n\n\n\n<li>Brug teltning, n\u00e5r pladsen er trang, og du kan acceptere, at via'en ikke er et testpunkt. Teltning er billigere end fyldning, men det har sine begr\u00e6nsninger, n\u00e5r det g\u00e6lder langsigtet beskyttelse mod fugt og forurening.<\/li>\n\n\n\n<li>Brug fyldte vias, n\u00e5r du har brug for det bedste resultat. Fyldte vias koster mere, men de giver en flad top til montering og holder loddetin og forurening ude. Hvis du laver mange kort, eller hvis kortet skal holde l\u00e6nge under h\u00e5rde forhold, er fyldning et godt valg.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Andre p\u00e5lidelighedsfaktorer<\/h2>\n\n\n\n<p>Vias kan ogs\u00e5 p\u00e5virke andre dele af designet. De kan f.eks. \u00e6ndre de termiske baner og skabe punkter, hvor stress koncentreres. N\u00e5r en via er t\u00e6t p\u00e5 en termisk aflastning eller en varmekilde, \u00e6ndrer det, hvordan varmen str\u00f8mmer i printet. Det kan p\u00e5virke komponenternes levetid og kan \u00e6ndre, hvor godt en del afk\u00f8les.<\/p>\n\n\n\n<p>Vias n\u00e6r h\u00f8jhastighedsspor eller RF-spor kan ogs\u00e5 for\u00e5rsage impedans\u00e6ndringer. Via-t\u00f8nden og via-pad'en tilf\u00f8jer kapacitans og induktans. Designere skal tjekke signalintegriteten, n\u00e5r vias er p\u00e5 kritiske stier.<a href=\"https:\/\/flj-pcb.com\/da\/step-by-step-hdi-pcb-blind-and-buried-via-process\/\" data-type=\"post\" data-id=\"4673\"> HDI<\/a> og mikrovias hj\u00e6lper her, fordi de er sm\u00e5 og har mindre indflydelse p\u00e5 h\u00f8jhastighedssignaler, n\u00e5r de er placeret rigtigt.<\/p>\n\n\n\n<p>N\u00e5r du bygger et kort til et produkt, der skal uds\u00e6ttes for mange varmecykler, eller til et produkt, der skal best\u00e5 strenge p\u00e5lidelighedstests, skal du planl\u00e6gge, hvordan viaerne vil opf\u00f8re sig over tid. Brug tykkere barrel plating, n\u00e5r du kan. Brug stablede eller forskudte mikrovias i HDI-designs for at reducere stress p\u00e5 en enkelt barrel. Brug de rigtige padst\u00f8rrelser, s\u00e5 printet ikke overbelaster kobberet under reflow eller under termisk cykling.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Til HDI og fleksible plader<\/h2>\n\n\n\n<p>HDI-kort og <a href=\"https:\/\/flj-pcb.com\/da\/pcb-manufacturer\/flexible-pcb\/\" data-type=\"page\" data-id=\"1901\">fleksible printkort<\/a> bruger mikrovias meget. Mikrovias er sm\u00e5 og har lav induktans. Det hj\u00e6lper med h\u00f8j hastighed og t\u00e6tte layouts. Hver microvia n\u00e5r normalt kun et indre lag. Producenterne bruger laserbor til at lave dem. De kan stable microvias for at forbinde flere lag i et lille omr\u00e5de. Stablede microvias fungerer som blinde eller nedgravede vias, n\u00e5r man stabler dem, og de kan hj\u00e6lpe med at holde plads til routing \u00e5ben i andre lag.<\/p>\n\n\n\n<p>P\u00e5 fleksible print kan den mekaniske b\u00f8jning i n\u00e6rheden af vias skade t\u00f8nden, hvis viaen ikke er placeret korrekt. I flexomr\u00e5der skal du fors\u00f8ge at holde vias ude af de vigtigste b\u00f8jningslinjer. Brug s\u00e6rlige via-designs og materialeh\u00e5ndtering for at reducere risikoen for revner, n\u00e5r printet b\u00f8jes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Praktiske regler og eksempler<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Minimumsboring: 20 mil. Dette er et almindeligt minimum for standardproduktion. Mindre bor kr\u00e6ver s\u00e6rlige processer og koster mere.<\/li>\n\n\n\n<li>Ringformet ring: 7 mil. Dette giver nok kobber omkring hullet til en p\u00e5lidelig forbindelse og til lodning.<\/li>\n\n\n\n<li>Billedformat: Begr\u00e6ns til 6:1. Dette holder pletteringskvaliteten h\u00f8j. Hvis pladen er tykkere end den anbefalede v\u00e6rdi for hulst\u00f8rrelsen, kan t\u00f8ndebel\u00e6gningen v\u00e6re tynd og fejle.<\/li>\n\n\n\n<li>Eksempel: Hvis boret er 20 mil, skal du bruge en pudediameter p\u00e5 ca. 34 mil. Det giver en tilstr\u00e6kkelig ring. Til en plade med en tykkelse p\u00e5 op til 120 mil er denne kombination brugbar p\u00e5 mange fabrikker.<\/li>\n<\/ul>\n\n\n\n<p>Brug disse regler som udgangspunkt. Hver fabrik kan have lidt forskellige gr\u00e6nser. Tal med din tavleproducent tidligt, s\u00e5 du kan matche designvalg med, hvad de kan g\u00f8re p\u00e5lideligt.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Overvejelser om montering og testning<\/h2>\n\n\n\n<p>Hvis du bruger tenting eller fill, skal du t\u00e6nke p\u00e5 testning. Teltede vias kan ikke fungere som probepunkter. Fyldte vias, der er belagt, kan stadig testes, hvis fyldningen og bel\u00e6gningen h\u00e5ndteres korrekt under produktionen. Hvis testning er vigtig, skal du planl\u00e6gge testpuder, testvias eller andre teststrategier, der passer til din montageproces.<\/p>\n\n\n\n<p>N\u00e5r du placerer en via i n\u00e6rheden af en loddepude, skal du planl\u00e6gge loddeprocessen. Hvis du bruger mange vias under en stor BGA, kan du overveje at fylde og plettere viaerne og f\u00e5 BGA'en til at lande p\u00e5 en flad overflade. Det mindsker risikoen for hulrum i loddet, og det hj\u00e6lper med den termiske spredning.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Renlighed og korrosion<\/h2>\n\n\n\n<p>Vias kan fange flux, fugt og andre forurenende stoffer. Det er v\u00e6rre, n\u00e5r du har vias, der ikke er perfekte, eller n\u00e5r du bruger vias som termiske stier, der flytter fugt ind og ud under termiske cyklusser. Brug god reng\u00f8ring efter montering, n\u00e5r designet har brug for det. Brug p\u00e5lidelige materialer og overflader, der modst\u00e5r korrosion i det forventede milj\u00f8. Fyldte vias hj\u00e6lper her, fordi de holder forurenende stoffer ude.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Konklusion<\/h2>\n\n\n\n<p>Vias er n\u00f8dvendige for PCB'er med flere lag. De giver dig mulighed for at placere flere dele og dirigere komplekse net. Men vias \u00e6ndrer ogs\u00e5, hvordan loddetinnet opf\u00f8rer sig, og de tilf\u00f8jer mekaniske og termiske stresspunkter. Du kan reducere disse risici med gode designregler og med de rigtige valg tidligt i projektet.<\/p>\n\n\n\n<p>Designere b\u00f8r unders\u00f8ge p\u00e5lideligheden tidligt. En p\u00e5lidelighedsunders\u00f8gelse \u00f8ger chancen for succes, s\u00e6nker omkostningerne i l\u00f8bet af produktets levetid, forkorter tiden til markedet og forbedrer kundetilfredsheden. For at lave et godt p\u00e5lidelighedsdesign har du brug for de rigtige mennesker, de rigtige v\u00e6rkt\u00f8jer og tid nok. Planl\u00e6g via-typer, st\u00f8rrelser, placering og behandling sammen med din producent og dit montagehus. Brug loddemasked\u00e6mninger, teltning eller via-fyldning, hvor hver metode passer. Brug microvias til HDI- og flex-designs, n\u00e5r det hj\u00e6lper.<\/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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