{"id":5054,"date":"2026-01-31T08:14:00","date_gmt":"2026-01-31T00:14:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=5054"},"modified":"2026-01-21T15:56:43","modified_gmt":"2026-01-21T07:56:43","slug":"cracked-vias-and-barrel-cracks-in-pcb","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/","title":{"rendered":"S\u00e4r\u00f6ill\u00e4 olevat viat ja tynnyrihalkeamat PCB:ss\u00e4"},"content":{"rendered":"<p>Haljenneet l\u00e4piviennit ja tynnyrihalkeamat ovat kriittisimpi\u00e4 <strong>piilev\u00e4t luotettavuush\u00e4iri\u00f6t<\/strong> PCB-valmistuksessa.<\/p><p>N\u00e4m\u00e4 viat l\u00e4p\u00e4isev\u00e4t usein alkuper\u00e4isen s\u00e4hk\u00f6isen testauksen, mutta ep\u00e4onnistuvat my\u00f6hemmin l\u00e4mp\u00f6- tai mekaanisessa rasituksessa, mik\u00e4 tekee niist\u00e4 erityisen vaarallisia korkean luotettavuuden sovelluksissa.<\/p><p>T\u00e4ss\u00e4 artikkelissa selitet\u00e4\u00e4n:<\/p><ul class=\"wp-block-list\"><li>Mit\u00e4 ovat halkeamat ja tynnyrihalkeamat?<\/li>\n\n<li>Miksi niit\u00e4 esiintyy<\/li>\n\n<li>Miten ne havaitaan<\/li>\n\n<li>Miten valmistajat v\u00e4hent\u00e4v\u00e4t niiden esiintymist\u00e4<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"337\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures.jpg\" alt=\"PCB-viat\" class=\"wp-image-5055\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-300x169.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-18x10.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Sis\u00e4llysluettelo<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#What_Are_Via_Cracks_and_Barrel_Cracks\" >Mit\u00e4 ovat Via- ja tynnyrihalkeamat?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Via_Crack\" >Crackin kautta<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Barrel_Crack\" >Tynnyrin halkeama<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Why_Via_Cracks_Are_a_Serious_Reliability_Issue\" >Miksi Via-s\u00e4r\u00f6t ovat vakava luotettavuusongelma<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Primary_Causes_of_Via_and_Barrel_Cracks\" >Via- ja tynnyrihalkeamien ensisijaiset syyt<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Z-Axis_Expansion_Mismatch\" >Z-akselin laajeneminen ep\u00e4suhta<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Thin_or_Non-Uniform_Copper_Plating\" >Ohut tai ep\u00e4tasainen kuparointi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#High_Aspect_Ratio_Vias\" >Suuren kuvasuhteen l\u00e4piviennit<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Excessive_Thermal_Cycling\" >Liiallinen l\u00e4mp\u00f6kierto<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Design_Factors_That_Increase_Via_Crack_Risk\" >Suunnittelutekij\u00e4t, jotka lis\u00e4\u00e4v\u00e4t halkeamariski\u00e4 Via Crackin kautta<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#High-Risk_Design_Choices\" >Korkean riskin suunnitteluvalinnat<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Manufacturing_Factors_Contributing_to_Via_Cracks\" >Via-s\u00e4r\u00f6j\u00e4 aiheuttavat valmistustekij\u00e4t<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Drilling_Quality\" >Porauksen laatu<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Inadequate_Desmear_Process\" >Riitt\u00e4m\u00e4t\u00f6n desmear-prosessi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Plating_Stress_Control\" >Plating Stressin hallinta<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#How_Via_Cracks_Are_Detected\" >Miten halkeamat havaitaan<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Common_Detection_Methods\" >Yleiset havaitsemismenetelm\u00e4t<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Preventing_Cracked_Vias_and_Barrel_Cracks\" >Haljenneiden vias- ja tynnyrihalkeamien est\u00e4minen<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Design-Level_Prevention\" >Suunnittelutason ennaltaehk\u00e4isy<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Process-Level_Prevention\" >Prosessitason ehk\u00e4isy<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Material_Selection\" >Materiaalin valinta<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Relationship_to_Other_PCB_Failure_Modes\" >Suhde muihin PCB:n vikaantumistapoihin<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Conclusion\" >P\u00e4\u00e4telm\u00e4<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Via_Cracks_in_PCB_FAQ\" >Via Cracks in PCB FAQ<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Are_Via_Cracks_and_Barrel_Cracks\"><\/span>Mit\u00e4 ovat Via- ja tynnyrihalkeamat?<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Via_Crack\"><\/span>Crackin kautta<span class=\"ez-toc-section-end\"><\/span><\/h3><p>L\u00e4pivientihalkeama on murtuma l\u00e4piviennin kuparipinnoitteessa, tyypillisesti:<\/p><ul class=\"wp-block-list\"><li>Polvi via<\/li>\n\n<li>Kuparin ja dielektrisen aineen v\u00e4linen rajapinta<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Barrel_Crack\"><\/span>Tynnyrin halkeama<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Piippuhalkeamalla tarkoitetaan erityisesti <strong>keh\u00e4n halkeama<\/strong> p\u00e4\u00e4llystetyss\u00e4 piipussa.<\/p><p>Molemmat katkaisevat s\u00e4hk\u00f6jatkuvuuden ajan my\u00f6t\u00e4.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Via_Cracks_Are_a_Serious_Reliability_Issue\"><\/span>Miksi Via-s\u00e4r\u00f6t ovat vakava luotettavuusongelma<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Halkeamat ovat vaarallisia, koska ne:<\/p><ul class=\"wp-block-list\"><li>ovat usein ajoittaisia<\/li>\n\n<li>Pahenee l\u00e4mp\u00f6kierron my\u00f6t\u00e4<\/li>\n\n<li>Niit\u00e4 on vaikea havaita silm\u00e4m\u00e4\u00e4r\u00e4isesti<\/li><\/ul><p>Ne ilmenev\u00e4t usein vasta kentt\u00e4k\u00e4yt\u00f6n tai rasitustestien j\u00e4lkeen.<\/p><p><em>Yleiskatsaus ep\u00e4onnistumiseen:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/common-pcb-failures-causes-solutions\/\">Yleiset PCB-viat selitetty<\/a><\/strong><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Primary_Causes_of_Via_and_Barrel_Cracks\"><\/span>Via- ja tynnyrihalkeamien ensisijaiset syyt<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Z-Axis_Expansion_Mismatch\"><\/span>Z-akselin laajeneminen ep\u00e4suhta<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Kuumennettaessa dielektriset materiaalit laajenevat Z-akselilla enemm\u00e4n kuin kupari.<\/p><p>Toistuva laajeneminen ja supistuminen aiheuttavat j\u00e4nnityst\u00e4 piipun kautta.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Thin_or_Non-Uniform_Copper_Plating\"><\/span>Ohut tai ep\u00e4tasainen kuparointi<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Riitt\u00e4m\u00e4t\u00f6n pinnoitepaksuus v\u00e4hent\u00e4\u00e4 l\u00e4piviennin kyky\u00e4 ottaa vastaan mekaanista rasitusta.<\/p><p> <em>Prosessin yksityiskohdat:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/copper-plating-process-in-pcb-manufacturing-explained\/\">Kuparointiprosessi PCB-valmistuksessa<\/a><\/strong><\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"High_Aspect_Ratio_Vias\"><\/span>Suuren kuvasuhteen l\u00e4piviennit<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Suuren kuvasuhteen l\u00e4pivientej\u00e4 on haastavampi levytt\u00e4\u00e4 tasaisesti, ja niihin kohdistuu suurempi rasitus.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Excessive_Thermal_Cycling\"><\/span>Liiallinen l\u00e4mp\u00f6kierto<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Toistuva altistuminen:<\/p><ul class=\"wp-block-list\"><li>Reflow-juottaminen<\/li>\n\n<li>Virtapy\u00f6r\u00e4ily<\/li>\n\n<li>Ymp\u00e4rist\u00f6n l\u00e4mp\u00f6tilan muutokset<\/li><\/ul><p>Nopeuttaa halkeamien muodostumista.<\/p><p><em>Luotettavuuden testaus:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-reliability-testing-standards\/\">PCB:n l\u00e4mp\u00f6luotettavuuden testaus<\/a><\/strong><\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"337\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-1.jpg\" alt=\"PCB-viat\" class=\"wp-image-5056\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-1-300x169.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-1-18x10.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Design_Factors_That_Increase_Via_Crack_Risk\"><\/span>Suunnittelutekij\u00e4t, jotka lis\u00e4\u00e4v\u00e4t halkeamariski\u00e4 Via Crackin kautta<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Tietyt suunnittelup\u00e4\u00e4t\u00f6kset lis\u00e4\u00e4v\u00e4t riski\u00e4 merkitt\u00e4v\u00e4sti.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"High-Risk_Design_Choices\"><\/span>Korkean riskin suunnitteluvalinnat<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Eritt\u00e4in pienet l\u00e4pivientien halkaisijat<\/li>\n\n<li>Ohut piirilevyn paksuus syvill\u00e4 l\u00e4pivienneill\u00e4<\/li>\n\n<li>Suuret kuparitasot ilman helpotusta<\/li>\n\n<li>Tihe\u00e4t via-in-pad-rakenteet<\/li><\/ul><p>Suunnittelun luotettavuustarkastelu on ratkaisevan t\u00e4rke\u00e4\u00e4.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Manufacturing_Factors_Contributing_to_Via_Cracks\"><\/span>Via-s\u00e4r\u00f6j\u00e4 aiheuttavat valmistustekij\u00e4t<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Drilling_Quality\"><\/span>Porauksen laatu<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Poran tahra, karkeat rei\u00e4n sein\u00e4m\u00e4t tai kuitujen irtoaminen heikent\u00e4v\u00e4t kuparin tarttuvuutta.<\/p><p><em>Vertailu:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-drilling-vs-laser-drilling\/\">PCB-poraus vs. laserporaus<\/a><\/strong><\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Inadequate_Desmear_Process\"><\/span>Riitt\u00e4m\u00e4t\u00f6n desmear-prosessi<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Huono desmear est\u00e4\u00e4 kuparin kunnollisen kiinnittymisen dielektriseen aineeseen.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Plating_Stress_Control\"><\/span>Plating Stressin hallinta<span class=\"ez-toc-section-end\"><\/span><\/h3><p>V\u00e4\u00e4r\u00e4nlainen pinnoituskemia voi aiheuttaa kuparikerrostumiin sis\u00e4isi\u00e4 j\u00e4nnityksi\u00e4.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Via_Cracks_Are_Detected\"><\/span>Miten halkeamat havaitaan<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Halkeamat havaitaan harvoin pelk\u00e4ll\u00e4 pintatarkastuksella.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Detection_Methods\"><\/span>Yleiset havaitsemismenetelm\u00e4t<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>L\u00e4mp\u00f6kuormitustestaus<\/li>\n\n<li>Mikroleikkausanalyysi<\/li>\n\n<li>S\u00e4hk\u00f6inen testaus py\u00f6r\u00e4ilyn j\u00e4lkeen<\/li>\n\n<li>R\u00f6ntgentarkastus (rajoitettu tehokkuus)<\/li><\/ul><p><em>Yleiskatsaus tarkastukseen:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-inspection-and-testing\/\">PCB:n tarkastus ja testaus selitetty<\/a><\/strong><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Preventing_Cracked_Vias_and_Barrel_Cracks\"><\/span>Haljenneiden vias- ja tynnyrihalkeamien est\u00e4minen<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Design-Level_Prevention\"><\/span>Suunnittelutason ennaltaehk\u00e4isy<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Riitt\u00e4v\u00e4 l\u00e4pimitta<\/li>\n\n<li>Hallittu kuvasuhde<\/li>\n\n<li>L\u00e4mp\u00f6tilan helpotuskuviot<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Process-Level_Prevention\"><\/span>Prosessitason ehk\u00e4isy<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Optimoidut porausparametrit<\/li>\n\n<li>Tasainen kuparipinnoituksen paksuus<\/li>\n\n<li>J\u00e4nnitysohjattu pinnoituskemia<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Material_Selection\"><\/span>Materiaalin valinta<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Materiaalit, joiden laajeneminen Z-akselilla on v\u00e4h\u00e4ist\u00e4<\/li>\n\n<li>Korkean Tg-arvon laminaatit l\u00e4mp\u00f6stabiilisuuden varmistamiseksi<\/li><\/ul><p>TOPFASTin kaltaiset valmistajat sis\u00e4llytt\u00e4v\u00e4t luotettavuusn\u00e4k\u00f6kohdat jo varhaisessa vaiheessa prosessin suunnitteluun.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"337\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-2.jpg\" alt=\"PCB-viat\" class=\"wp-image-5057\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-2.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-2-300x169.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-2-18x10.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Relationship_to_Other_PCB_Failure_Modes\"><\/span>Suhde muihin PCB:n vikaantumistapoihin<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Via cracks usein rinnakkain:<\/p><ul class=\"wp-block-list\"><li>Delaminaatio<\/li>\n\n<li>CAF:n muodostaminen<\/li>\n\n<li>Ajoittaiset avoimet virtapiirit<\/li><\/ul><p><em>Aiheeseen liittyv\u00e4 aihe:<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-delamination-causes-prevention\/\">PCB Delamination Syyt ja ehk\u00e4isy<\/a><\/strong><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>P\u00e4\u00e4telm\u00e4<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Halkeilleet l\u00e4piviennit ja tynnyrihalkeamat eiv\u00e4t ole satunnaisia vikoja vaan ennustettavissa olevia seurauksia seuraavista syist\u00e4 <strong>l\u00e4mp\u00f6rasitus, suunnittelup\u00e4\u00e4t\u00f6kset ja prosessin rajoitukset<\/strong>.<\/p><p>Kautta:<\/p><ul class=\"wp-block-list\"><li>Asianmukaiset suunnitteluk\u00e4yt\u00e4nn\u00f6t<\/li>\n\n<li>Valvotut valmistusprosessit<\/li>\n\n<li>Asianmukainen materiaalivalinta<\/li><\/ul><p>Niiden esiintymist\u00e4 voidaan v\u00e4hent\u00e4\u00e4 merkitt\u00e4v\u00e4sti.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Via_Cracks_in_PCB_FAQ\"><\/span>Via Cracks in PCB FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2><div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1768981138484\"><strong class=\"schema-faq-question\">K: Voiko halkeamia korjata?<\/strong> <p class=\"schema-faq-answer\">V: Ei. Kun l\u00e4piviennit ovat kerran halkeilleet, niit\u00e4 ei voi luotettavasti korjata.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1768981208332\"><strong class=\"schema-faq-question\">Q: <strong>Aiheuttavatko kaikki halkeamat v\u00e4litt\u00f6m\u00e4n vian?<\/strong><\/strong> <p class=\"schema-faq-answer\">V: Ei. Monet ovat piilevi\u00e4 ja ajoittaisia.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1768981226138\"><strong class=\"schema-faq-question\">Q: <strong>Onko paksumpi kupari aina parempi?<\/strong><\/strong> <p class=\"schema-faq-answer\">V: Ei aina, mutta riitt\u00e4v\u00e4 ja tasainen paksuus on ratkaisevan t\u00e4rke\u00e4\u00e4.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1768981244482\"><strong class=\"schema-faq-question\">Q: <strong>Ovatko via-s\u00e4r\u00f6t yleisempi\u00e4 lyijytt\u00f6m\u00e4ss\u00e4 kokoonpanossa?<\/strong><\/strong> <p class=\"schema-faq-answer\">V: Kyll\u00e4, korkeampien reflow-l\u00e4mp\u00f6tilojen vuoksi.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1768981259852\"><strong class=\"schema-faq-question\">Q: <strong>Voiko r\u00f6ntgen havaita halkeamien kautta?<\/strong><\/strong> <p class=\"schema-faq-answer\">V: Yleens\u00e4 ei, elleiv\u00e4t halkeamat ole vakavia.<\/p> <\/div> <\/div>","protected":false},"excerpt":{"rendered":"<p>Haljenneet l\u00e4piviennit ja tynnyrihalkeamat ovat yleisi\u00e4 piirilevyn vikoja. T\u00e4ss\u00e4 artikkelissa tarkastellaan niiden perimm\u00e4isi\u00e4 syit\u00e4, havaitsemistekniikoita ja ennaltaehk\u00e4isevi\u00e4 toimenpiteit\u00e4, joita valmistajat k\u00e4ytt\u00e4v\u00e4t luotettavuuden varmistamiseksi.<\/p>","protected":false},"author":1,"featured_media":5058,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[438],"class_list":["post-5054","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-pcb-failures"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cracked Vias and Barrel Cracks in PCB: Causes, Detection, and Prevention<\/title>\n<meta name=\"description\" content=\"Cracked vias and barrel cracks are common PCB reliability failures. 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