{"id":6268,"date":"2026-09-28T08:00:00","date_gmt":"2026-09-28T00:00:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=6268"},"modified":"2026-08-05T19:27:04","modified_gmt":"2026-08-05T11:27:04","slug":"bga-underfill-pcba","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/tr\/blog\/bga-underfill-pcba\/","title":{"rendered":"BGA Alt Dolgu: Mekanik Darbe ve Termal Gerilime Kar\u015f\u0131 PCBA G\u00fcvenilirli\u011finin Art\u0131r\u0131lmas\u0131"},"content":{"rendered":"<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\">\u0130\u00e7indekiler<\/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\/tr\/blog\/bga-underfill-pcba\/#Introduction_to_BGA_Underfill_and_PCBA_Reliability\" >BGA Alt Dolgu ve PCBA G\u00fcvenilirli\u011fine Giri\u015f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.topfastpcb.com\/tr\/blog\/bga-underfill-pcba\/#The_Physics_of_Solder_Joint_Failure_in_High-Density_Packages\" >Y\u00fcksek Yo\u011funluklu Paketlerde Lehim Ba\u011flant\u0131s\u0131 Ar\u0131zalar\u0131n\u0131n Fizi\u011fi<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topfastpcb.com\/tr\/blog\/bga-underfill-pcba\/#Coefficient_of_Thermal_Expansion_CTE_Mismatch\" >Is\u0131l Genle\u015fme Katsay\u0131s\u0131 (CTE) Uyumsuzlu\u011fu<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.topfastpcb.com\/tr\/blog\/bga-underfill-pcba\/#Mechanical_Shock_and_Vibrational_Fatigue\" >Mekanik Darbe ve Titre\u015fim Yorgunlu\u011fu<\/a><\/li><\/ul><\/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\/tr\/blog\/bga-underfill-pcba\/#Types_of_BGA_Underfill_Materials\" >BGA Alt Dolgu Malzemelerinin T\u00fcrleri<\/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\/tr\/blog\/bga-underfill-pcba\/#Capillary_Underfill_CUF\" >K\u0131lcal Dolgu (CUF)<\/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\/tr\/blog\/bga-underfill-pcba\/#No-Flow_Underfill_NUF\" >Ak\u0131\u015fs\u0131z Alt Dolgu (NUF)<\/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\/tr\/blog\/bga-underfill-pcba\/#Molded_Underfill_MUF\" >Kal\u0131pl\u0131 Alt Dolgu (MUF)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.topfastpcb.com\/tr\/blog\/bga-underfill-pcba\/#Key_Material_Properties_of_Underfill\" >Underfill'in Temel Malzeme \u00d6zellikleri<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.topfastpcb.com\/tr\/blog\/bga-underfill-pcba\/#Glass_Transition_Temperature_Tg\" >Cam Ge\u00e7i\u015f S\u0131cakl\u0131\u011f\u0131 (Tg)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.topfastpcb.com\/tr\/blog\/bga-underfill-pcba\/#Coefficient_of_Thermal_Expansion_CTE\" >Termal Genle\u015fme Katsay\u0131s\u0131 (CTE)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.topfastpcb.com\/tr\/blog\/bga-underfill-pcba\/#Youngs_Modulus\" >Young Mod\u00fcl\u00fc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.topfastpcb.com\/tr\/blog\/bga-underfill-pcba\/#Viscosity_and_Filler_Content\" >Viskozite ve Dolgu Maddesi \u0130\u00e7eri\u011fi<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.topfastpcb.com\/tr\/blog\/bga-underfill-pcba\/#How_to_Apply_Capillary_BGA_Underfill_Step-by-Step_Guide\" >K\u0131lcal BGA Alt Dolgu Maddesi Nas\u0131l Uygulan\u0131r (Ad\u0131m Ad\u0131m K\u0131lavuz)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.topfastpcb.com\/tr\/blog\/bga-underfill-pcba\/#Defect_Analysis_and_Reliability_Testing\" >Hata Analizi ve G\u00fcvenilirlik Testi<\/a><\/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\/tr\/blog\/bga-underfill-pcba\/#Advanced_Considerations_Reworkability_and_Flux_Compatibility\" >\u0130leri D\u00fczey Hususlar: Yeniden \u0130\u015flenebilirlik ve Ak\u0131 Uyumlulu\u011fu<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.topfastpcb.com\/tr\/blog\/bga-underfill-pcba\/#Frequently_Asked_Questions_FAQ\" >S\u0131k\u00e7a Sorulan Sorular (SSS)<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Introduction_to_BGA_Underfill_and_PCBA_Reliability\"><\/span>BGA Alt Dolgu ve PCBA G\u00fcvenilirli\u011fine Giri\u015f<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Bask\u0131l\u0131 devre kart\u0131 montajlar\u0131 (PCBA\u2019lar) giderek k\u00fc\u00e7\u00fclmeye ve daha y\u00fcksek yo\u011funluklu ba\u011flant\u0131 sistemlerini (HDI) bar\u0131nd\u0131rmaya devam ettik\u00e7e, Ball Grid Array (BGA), \u00c7ip \u00d6l\u00e7ekli Paket (CSP) ve Yonga Seviyesi \u00c7ip \u00d6l\u00e7ekli Paket (WLCSP) bile\u015fenlerinin kullan\u0131m\u0131, elektronik \u00fcretim sekt\u00f6r\u00fcnde yayg\u0131n bir hale gelmi\u015ftir. Bu paketleme teknolojileri \u00fcst\u00fcn elektriksel performans, daha k\u0131sa sinyal yollar\u0131 ve yo\u011fun paketlenmi\u015f G\/\u00c7 yap\u0131land\u0131rmalar\u0131 sunarken, ayn\u0131 zamanda \u00f6nemli ve karma\u015f\u0131k mekanik zorluklar da ortaya koymaktad\u0131r. Temel yap\u0131sal zay\u0131fl\u0131k, sert silikon paketi ile nispeten esnek FR-4 veya poliimid PCB substrat\u0131n\u0131 birbirine ba\u011flayan SMT lehim ba\u011flant\u0131lar\u0131n\u0131n b\u00fct\u00fcnl\u00fc\u011f\u00fcnde yatmaktad\u0131r. Bu zay\u0131fl\u0131klar\u0131n\u0131 etkili bir \u015fekilde azaltmak i\u00e7in donan\u0131m m\u00fchendisleri ve \u00fcretim uzmanlar\u0131, BGA alt dolgu maddesini kullanmaktad\u0131r. Bu, bile\u015fen yongas\u0131 ile kart alt tabakas\u0131 aras\u0131ndaki bo\u015flu\u011fu tamamen doldurarak lehim k\u00fcrelerini tamamen kaplayacak \u015fekilde tasarlanm\u0131\u015f, \u00f6zel ve y\u00fcksek m\u00fchendislik \u00fcr\u00fcn\u00fc bir epoksi kaps\u00fclleme maddesidir.<\/p>\n<p>BGA alt dolgu maddesinin temel i\u015flevi, yap\u0131sal ve mekanik y\u00fck\u00fc k\u0131r\u0131lgan lehim ba\u011flant\u0131 noktalar\u0131ndan uzakla\u015ft\u0131rmak ve bunu bile\u015fen taban\u0131n\u0131n t\u00fcm y\u00fczey alan\u0131 boyunca e\u015fit bir \u015fekilde da\u011f\u0131tmakt\u0131r. Otomotiv kontrol mod\u00fclleri, havac\u0131l\u0131k ve uzay aviyonikleri, telekom\u00fcnikasyon altyap\u0131s\u0131 ve dayan\u0131kl\u0131 end\u00fcstriyel elektronikler gibi y\u00fcksek g\u00fcvenilirlik gerektiren ve g\u00f6rev a\u00e7\u0131s\u0131ndan kritik uygulamalarda, korumas\u0131z lehim ba\u011flant\u0131lar\u0131 a\u015f\u0131r\u0131 termal d\u00f6ng\u00fcler, mekanik \u015fok darbeleri ve s\u00fcrekli harmonik titre\u015fimlerin neden oldu\u011fu yorgunluk, mikro k\u0131r\u0131lma ve nihai ar\u0131zalara kar\u015f\u0131 son derece hassast\u0131r. BGA\u2019y\u0131 alt tabakaya temelde sert bir \u015fekilde ba\u011flayarak, alt dolgu, a\u015f\u0131r\u0131 \u00e7al\u0131\u015fma gerilmeleri alt\u0131nda PCBA\u2019n\u0131n dayan\u0131kl\u0131l\u0131\u011f\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131r\u0131r ve nihai \u00fcr\u00fcn\u00fcn uzun \u00f6m\u00fcrl\u00fcl\u00fc\u011f\u00fcn\u00fc ve g\u00fcvenilirli\u011fini garanti eder.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"The_Physics_of_Solder_Joint_Failure_in_High-Density_Packages\"><\/span>Y\u00fcksek Yo\u011funluklu Paketlerde Lehim Ba\u011flant\u0131s\u0131 Ar\u0131zalar\u0131n\u0131n Fizi\u011fi<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>BGA alt dolgu i\u015fleminin gereklili\u011fini ve arkas\u0131ndaki m\u00fchendislik ilkelerini tam olarak kavrayabilmek i\u00e7in, y\u00fczeye monte teknolojisi (SMT) lehim ba\u011flant\u0131lar\u0131nda g\u00f6r\u00fclen ar\u0131za mekanizmalar\u0131n\u0131, \u00f6zellikle de farkl\u0131 termomekanik \u00f6zelliklere sahip ayr\u0131 malzeme katmanlar\u0131n\u0131n bulundu\u011fu durumlarda, derinlemesine anlamak gerekir.<\/p>\n<div style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/08\/PCB-BGA-Underfill-1.jpg\" alt=\"PCB BGA Alt Dolgu Maddesi\" width=\"600\" height=\"389\" class=\"aligncenter size-full wp-image-6449\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/08\/PCB-BGA-Underfill-1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/08\/PCB-BGA-Underfill-1-300x195.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/08\/PCB-BGA-Underfill-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/div>\n<h3><span class=\"ez-toc-section\" id=\"Coefficient_of_Thermal_Expansion_CTE_Mismatch\"><\/span>Is\u0131l Genle\u015fme Katsay\u0131s\u0131 (CTE) Uyumsuzlu\u011fu<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>BGA g\u00fcvenilirli\u011fi i\u00e7in en yayg\u0131n ve ka\u00e7\u0131n\u0131lmaz tehdit, termal d\u00f6ng\u00fcd\u00fcr. Tipik bir \u00e7\u0131plak silikon yonga, yakla\u015f\u0131k 2,6 ppm\/\u00b0C\u2019lik bir Termal Genle\u015fme Katsay\u0131s\u0131 (CTE) g\u00f6sterir. Buna kar\u015f\u0131l\u0131k, standart bir FR-4 PCB substrat\u0131n\u0131n X-Y d\u00fczlemindeki CTE de\u011feri 14 ile 18 ppm\/\u00b0C aras\u0131nda de\u011fi\u015fir. PCBA, ister ortamdaki de\u011fi\u015fikliklerden ister IC'nin kendisinden kaynaklanan yo\u011fun dahili g\u00fc\u00e7 d\u00f6ng\u00fclerinden kaynaklans\u0131n, \u00f6nemli s\u0131cakl\u0131k dalgalanmalar\u0131na maruz kald\u0131\u011f\u0131nda, alt tabaka sert silikon pakete k\u0131yasla \u00f6nemli \u00f6l\u00e7\u00fcde daha y\u00fcksek bir oranda genle\u015fir ve b\u00fcz\u00fcl\u00fcr.<\/p>\n<p>Bu ciddi CTE uyumsuzlu\u011fu, birbirinden farkl\u0131 iki malzemeyi birbirine ba\u011flayan lehim ba\u011flant\u0131 noktalar\u0131nda muazzam bir kesme gerilimi olu\u015fturur. Tekrarlanan termal d\u00f6ng\u00fcler boyunca bu gerilme enerjisi birikir ve gerilme yo\u011funla\u015fma noktalar\u0131nda mikro \u00e7atlaklar olu\u015fmas\u0131na neden olur. Bu gerilme yo\u011funla\u015fma noktalar\u0131 genellikle ped-lehim aray\u00fcz\u00fcn\u00fcn yak\u0131n\u0131nda veya bak\u0131r ped ile lehim ala\u015f\u0131m\u0131 aras\u0131nda olu\u015fan k\u0131r\u0131lgan intermetalik bile\u015fik (IMC) tabakas\u0131n\u0131n i\u00e7inde bulunur. Termal d\u00f6ng\u00fcler durmaks\u0131z\u0131n devam ettik\u00e7e, bu mikroskobik \u00e7atlaklar lehim k\u00fctlesinin tamam\u0131na yay\u0131l\u0131r ve sonunda tam bir elektriksel a\u00e7\u0131k devre ve sistem ar\u0131zas\u0131na yol a\u00e7ar. BGA alt dolgusu, silikon ile FR-4 aras\u0131ndaki fark\u0131 kapatacak \u015fekilde tasarlanm\u0131\u015f bir CTE de\u011ferine sahip olmas\u0131 sayesinde bu sorunu do\u011frudan azalt\u0131r; b\u00f6ylece montaj\u0131 etkili bir \u015fekilde birbirine sabitler ve tek tek lehim \u00e7\u0131k\u0131nt\u0131lar\u0131 \u00fczerindeki yerel kesme gerilimini bast\u0131r\u0131r.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Mechanical_Shock_and_Vibrational_Fatigue\"><\/span>Mekanik Darbe ve Titre\u015fim Yorgunlu\u011fu<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Termal gerilimin \u00f6tesinde, modern ta\u015f\u0131nabilir elektronik cihazlar ve otomotiv montajlar\u0131, tekrar tekrar \u015fiddetli mekanik darbelere (\u00f6rne\u011fin, d\u00fc\u015fme darbeleri) ve aral\u0131ks\u0131z titre\u015fimlere maruz kalmaktad\u0131r. Dinamik bir d\u00fc\u015fme olay\u0131 s\u0131ras\u0131nda, PCB h\u0131zl\u0131 bir \u015fekilde b\u00fck\u00fclme ve e\u011frilme ya\u015far. Bu dinamik b\u00fck\u00fclme, milisaniyeler i\u00e7inde k\u0131r\u0131lgan lehim ba\u011flant\u0131lar\u0131n\u0131 kolayca k\u0131rabilecek \u015fiddetli \u00e7ekme ve bas\u0131n\u00e7 gerilmeleri yarat\u0131r. Bu durum, geleneksel, esnek SnPb (Kalay-Kur\u015fun) lehimine k\u0131yasla do\u011fas\u0131 gere\u011fi daha sert, rijit ve k\u0131r\u0131lgan olan kur\u015funsuz SAC (Kalay-G\u00fcm\u00fc\u015f-Bak\u0131r) ala\u015f\u0131mlar\u0131yla \u00fcretilen modern montajlar i\u00e7in \u00f6zellikle ge\u00e7erlidir. Alt dolgu, g\u00fc\u00e7l\u00fc bir mekanik darbe emici ve sertle\u015ftirici g\u00f6revi g\u00f6r\u00fcr; PCB\u2019nin esnemesinin do\u011frudan lehim ba\u011flant\u0131lar\u0131n\u0131n kesilmesine d\u00f6n\u00fc\u015fmesini \u00f6nleyen s\u00f6n\u00fcmleme ve sertlik sa\u011flar.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Types_of_BGA_Underfill_Materials\"><\/span>BGA Alt Dolgu Malzemelerinin T\u00fcrleri<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Uygun bir alt dolgu malzemesinin se\u00e7imi rastgele de\u011fildir; bu se\u00e7im, b\u00fcy\u00fck \u00f6l\u00e7\u00fcde spesifik \u00fcretim s\u00fcreci ak\u0131\u015f\u0131na, bile\u015fenin karma\u015f\u0131k mimarisine ve hedeflenen \u00e7al\u0131\u015fma ortam\u0131na ba\u011fl\u0131d\u0131r. SMT\u2019de kullan\u0131lan alt dolgu malzemelerinin \u00fc\u00e7 temel s\u0131n\u0131fland\u0131rmas\u0131, K\u0131lcal, Ak\u0131\u015fs\u0131z ve Kal\u0131pl\u0131\u2019d\u0131r.<\/p>\n<div style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/08\/PCB-BGA-Underfill-2.jpg\" alt=\"PCB BGA Alt Dolgu Maddesi\" width=\"600\" height=\"385\" class=\"aligncenter size-full wp-image-6450\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/08\/PCB-BGA-Underfill-2.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/08\/PCB-BGA-Underfill-2-300x193.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/08\/PCB-BGA-Underfill-2-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/div>\n<h3><span class=\"ez-toc-section\" id=\"Capillary_Underfill_CUF\"><\/span>K\u0131lcal Dolgu (CUF)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>K\u0131lcal dolgu, y\u00fcksek g\u00fcvenilirlikli \u00fcretimde yeniden ak\u0131\u015f sonras\u0131 kaps\u00fclleme i\u00e7in en yayg\u0131n olarak kullan\u0131lan ve en sa\u011flam y\u00f6ntemdir. Bu malzeme \u2014 genellikle y\u00fcksek oranda silika dolgulu, d\u00fc\u015f\u00fck viskoziteli bir epoksi re\u00e7inesidir \u2014 bile\u015fen kart \u00fczerine ba\u015far\u0131yla lehimlendikten ve ilk denetimden ge\u00e7tikten sonra BGA'n\u0131n bir veya iki kenar\u0131 boyunca hassas bir \u015fekilde da\u011f\u0131t\u0131l\u0131r. Do\u011fal k\u0131lcal hareket sayesinde, s\u0131v\u0131 re\u00e7ine bile\u015fenin alt\u0131na h\u0131zla \u00e7ekilir ve kar\u015f\u0131 taraftan \u00e7\u0131kana kadar yo\u011fun \u015fekilde paketlenmi\u015f lehim k\u00fcreleri aras\u0131nda kesintisiz bir \u015fekilde akar. Bu, kesintisiz bir kaps\u00fclleme tabakas\u0131 ve paketin t\u00fcm \u00e7evresi boyunca hayati \u00f6neme sahip bir yap\u0131sal dolgu olu\u015fturur. Bu s\u00fcre\u00e7, optimum ak\u0131\u015f viskozitesini korumak i\u00e7in b\u00fcy\u00fck \u00f6l\u00e7\u00fcde y\u00fczey gerilimi dinamiklerine ve hassas alt tabaka \u0131s\u0131tmas\u0131na dayan\u0131r.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"No-Flow_Underfill_NUF\"><\/span>Ak\u0131\u015fs\u0131z Alt Dolgu (NUF)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No-Flow Underfill (NUF), birincil SMT montaj s\u00fcrecine do\u011frudan entegre edilir ve b\u00f6ylece maliyetli bir ikincil reflow sonras\u0131 da\u011f\u0131t\u0131m ad\u0131m\u0131na olan ihtiyac\u0131 ortadan kald\u0131r\u0131r. NUF, genellikle \u201cpick-and-place\u201d i\u015fleminden \u00f6nce, \u00e7\u0131plak PCB \u00fczerindeki BGA pedinin izine do\u011frudan, y\u00fcksek viskoziteli ve hassas bir \u015fekilde \u00f6l\u00e7\u00fclm\u00fc\u015f bir damla olarak da\u011f\u0131t\u0131l\u0131r. Ard\u0131ndan BGA bile\u015feni, alt dolgu maddesinin i\u00e7ine bast\u0131r\u0131l\u0131r. Standart yeniden ak\u0131\u015f f\u0131r\u0131n\u0131 d\u00f6ng\u00fcs\u00fc s\u0131ras\u0131nda NUF, bir yandan aktif bir ak\u0131 maddesi olarak i\u015flev g\u00f6r\u00fcr \u2014 lehim k\u00fcreleri ve PCB pedleri \u00fczerindeki oksitleri azaltarak uygun metalurjik ba\u011flanmay\u0131 kolayla\u015ft\u0131r\u0131r \u2014 di\u011fer yandan da lehim kat\u0131la\u015f\u0131rken \u0131s\u0131 ile sertle\u015fen ve k\u00fcrlenen sa\u011flam bir kaps\u00fclleme maddesi olarak g\u00f6rev yapar. NUF, \u00fcretimi \u00f6nemli \u00f6l\u00e7\u00fcde kolayla\u015ft\u0131rsa da, genellikle CUF'un son derece y\u00fcksek dolgu maddesi i\u00e7eri\u011fine sahip de\u011fildir; bu da CTE azalt\u0131m\u0131n\u0131 en \u00fcst d\u00fczeye \u00e7\u0131karmada biraz daha az etkili olmas\u0131na neden olur. <strong>Hakk\u0131nda daha fazla bilgi edinin <a href=\"\/tr\/blog\/crosstalk-mitigation-high-speed-pcb\/\">\u00c7apraz Giri\u015fim Azaltma: Y\u00fcksek H\u0131zl\u0131 PCB\u2019lerde NEXT ve FEXT\u2019i En Aza \u0130ndirmek \u0130\u00e7in Geli\u015fmi\u015f Y\u00f6nlendirme Teknikleri<\/a>.<\/strong><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Molded_Underfill_MUF\"><\/span>Kal\u0131pl\u0131 Alt Dolgu (MUF)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Kal\u0131pl\u0131 alt dolgu, \u00f6ncelikle Sistem-i\u00e7inde-Paket (SiP), heterojen entegrasyon mod\u00fclleri ve geli\u015fmi\u015f bellek y\u0131\u011f\u0131nlar\u0131 gibi ileri d\u00fczey, ultra yo\u011fun yar\u0131 iletken paketlemelerde kullan\u0131l\u0131r. MUF s\u00fcre\u00e7lerinde, kat\u0131 veya y\u00fcksek viskoziteli bir kal\u0131plama bile\u015fi\u011fi, a\u015f\u0131r\u0131 \u0131s\u0131 ve bas\u0131n\u00e7 alt\u0131nda mikroskobik bo\u015fluklara zorla bas\u0131l\u0131r ve hem i\u00e7 yongay\u0131 hem de BGA ba\u011flant\u0131lar\u0131n\u0131 ayn\u0131 anda kaps\u00fcller. Bu, maksimum yap\u0131sal sa\u011flaml\u0131k ve \u00e7evresel koruma sa\u011flar, ancak genellikle kart d\u00fczeyindeki PCBA montaj a\u015famas\u0131ndan ziyade bile\u015fen d\u00fczeyindeki \u00fcretim a\u015famas\u0131yla s\u0131n\u0131rl\u0131d\u0131r.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Key_Material_Properties_of_Underfill\"><\/span>Underfill'in Temel Malzeme \u00d6zellikleri<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Do\u011fru alt dolgu malzemesinin belirlenmesi, bu malzemenin kendine \u00f6zg\u00fc reolojik ve termomekanik \u00f6zelliklerinin derinlemesine incelenmesini gerektirir. Uyumsuz bir alt dolgu form\u00fclasyonunun se\u00e7ilmesi, gerilme kaynakl\u0131 ar\u0131zalar\u0131 \u00f6nlemek yerine, asl\u0131nda bu t\u00fcr ar\u0131zalar\u0131n erken ortaya \u00e7\u0131kmas\u0131na neden olabilir.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Glass_Transition_Temperature_Tg\"><\/span>Cam Ge\u00e7i\u015f S\u0131cakl\u0131\u011f\u0131 (Tg)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Cam Ge\u00e7i\u015f S\u0131cakl\u0131\u011f\u0131 (Tg), underfill polimer matrisinin sert, cams\u0131 bir durumdan daha yumu\u015fak, daha esnek ve lastiksi bir duruma ge\u00e7ti\u011fi kritik termal e\u015fi\u011fidir. Tg\u2019nin alt\u0131nda, underfill d\u00fc\u015f\u00fck bir CTE de\u011ferine ve ola\u011fan\u00fcst\u00fc y\u00fcksek bir mod\u00fcle sahiptir; bu da BGA\u2019y\u0131 etkili bir \u015fekilde sabitler. Tg de\u011ferinin \u00fczerinde, malzemenin CTE de\u011feri \u00f6nemli \u00f6l\u00e7\u00fcde artar ve yap\u0131sal mod\u00fcl\u00fc d\u00fc\u015fer. Maksimum g\u00fcvenilirlik i\u00e7in, alt dolgu malzemesinin Tg de\u011feri ideal olarak PCBA\u2019n\u0131n maksimum s\u00fcrekli \u00e7al\u0131\u015fma s\u0131cakl\u0131\u011f\u0131ndan daha y\u00fcksek olmal\u0131d\u0131r; bu sayede malzemenin, \u00fcr\u00fcn\u00fcn t\u00fcm ya\u015fam d\u00f6ng\u00fcs\u00fc boyunca sert ve y\u00fcksek koruma sa\u011flayan durumunda kalmas\u0131 sa\u011flan\u0131r. <strong>Hakk\u0131nda daha fazla bilgi edinin <a href=\"\/tr\/blog\/m-sap-technology-pcb\/\">M-SAP Teknolojisi: Yeni Nesil Elektronik \u00dcr\u00fcnler i\u00e7in 25 Mikron Alt\u0131nda Hat\/Bo\u015fluk Mesafesi Sa\u011flanmas\u0131<\/a>.<\/strong><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Coefficient_of_Thermal_Expansion_CTE\"><\/span>Termal Genle\u015fme Katsay\u0131s\u0131 (CTE)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Daha \u00f6nce de belirtildi\u011fi gibi, CTE fark\u0131n\u0131 etkili bir \u015fekilde kapatmak hayati \u00f6nem ta\u015f\u0131r. \u0130deal bir alt dolgu form\u00fclasyonu, k\u00fcrlenmi\u015f alt dolgunun k\u0131r\u0131lgan \u00e7\u0131k\u0131nt\u0131lar \u00fczerinde ba\u011f\u0131ms\u0131z ve tahrip edici bir gerilim olu\u015fturmas\u0131n\u0131 \u00f6nlemek i\u00e7in, lehim ba\u011flant\u0131lar\u0131n\u0131n kendisiyle yak\u0131ndan e\u015fle\u015fen bir CTE de\u011ferine (genellikle yakla\u015f\u0131k 20-25 ppm\/\u00b0C) sahip olmal\u0131d\u0131r. Kimya \u00fcreticileri, baz s\u0131v\u0131 epoksi re\u00e7inesini mikroskobik, k\u00fcresel silika dolgu maddeleriyle kar\u0131\u015ft\u0131rarak bu hassas hedef CTE de\u011ferlerine ula\u015fmaktad\u0131r.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Youngs_Modulus\"><\/span>Young Mod\u00fcl\u00fc<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Young Mod\u00fcl\u00fc, tamamen k\u00fcrlenmi\u015f alt dolgu maddesinin sertli\u011fini ve rijitli\u011fini belirler. Y\u00fcksek mod\u00fcll\u00fc (sert) bir alt dolgu maddesi, bile\u015feni kart \u00fczerine do\u011frudan ve s\u0131k\u0131 bir \u015fekilde ba\u011flayarak termal yorgunlu\u011fa kar\u015f\u0131 m\u00fckemmel koruma sa\u011flar. Ancak mod\u00fcl a\u015f\u0131r\u0131 y\u00fcksekse, silikon yongan\u0131n i\u00e7indeki hassas d\u00fc\u015f\u00fck-k dielektrik katmanlara \u00e7ok fazla mekanik gerilim aktarabilir ve bu da yongada ciddi \u00e7atlaklara veya katman ayr\u0131\u015fmas\u0131na yol a\u00e7abilir. Do\u011fru ve dengeli bir mod\u00fcl tasarlamak, malzeme bilimcileri i\u00e7in karma\u015f\u0131k bir optimizasyon sorunudur.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Viscosity_and_Filler_Content\"><\/span>Viskozite ve Dolgu Maddesi \u0130\u00e7eri\u011fi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Viskozite, bir kapiler alt dolgu maddesinin s\u0131k aral\u0131kl\u0131, d\u00fc\u015f\u00fck standoff mesafeli bir bile\u015fenin alt\u0131nda ne kadar etkili bir \u015fekilde akaca\u011f\u0131n\u0131 belirler. CTE\u2019yi d\u00fc\u015f\u00fcrmek ve mod\u00fcl\u00fc art\u0131rmak i\u00e7in y\u00fcksek dolgu maddesi y\u00fck\u00fc (genellikle a\u011f\u0131rl\u0131k\u00e7a -70\u2019e kadar ula\u015f\u0131r) kesinlikle gereklidir. Ancak sert dolgu maddesi eklenmesi, s\u0131v\u0131n\u0131n viskozitesini \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131r\u0131r ve k\u0131lcal ak\u0131\u015f h\u0131z\u0131n\u0131 engeller. Geli\u015fmi\u015f modern alt dolgu malzemeleri, 100 mikron kadar k\u00fc\u00e7\u00fck ultra ince bump aral\u0131klar\u0131 i\u00e7in uygun ak\u0131\u015f \u00f6zelliklerini korurken y\u00fcksek dolgu yo\u011funluklar\u0131 elde etmek amac\u0131yla mikron alt\u0131 silika k\u00fcreleri ve \u00f6zel kimyasal reoloji de\u011fi\u015ftiriciler kullan\u0131r.<\/p>\n<h2><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/08\/PCB-BGA-Underfill.jpg\" alt=\"PCB BGA Alt Dolgu Maddesi\" width=\"600\" height=\"393\" class=\"aligncenter size-full wp-image-6448\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/08\/PCB-BGA-Underfill.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/08\/PCB-BGA-Underfill-300x197.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/08\/PCB-BGA-Underfill-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/h2>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Apply_Capillary_BGA_Underfill_Step-by-Step_Guide\"><\/span>K\u0131lcal BGA Alt Dolgu Maddesi Nas\u0131l Uygulan\u0131r (Ad\u0131m Ad\u0131m K\u0131lavuz)<span class=\"ez-toc-section-end\"><\/span><\/h2><div class=\"schema-how-to wp-block-yoast-how-to-block\"><p class=\"schema-how-to-description\">A\u015fa\u011f\u0131daki m\u00fchendislik kurallar\u0131na uyun. <strong>Hakk\u0131nda daha fazla bilgi edinin <a href=\"\/tr\/blog\/sequential-lamination-hdi\/\">S\u0131ral\u0131 Laminasyon: Her Katmanl\u0131 HDI Kartlar\u0131 \u0130\u00e7in \u00dcretim S\u00fcrecini Ustaca Uygulama<\/a>.<\/strong><\/p> <ol class=\"schema-how-to-steps\"><li class=\"schema-how-to-step\" id=\"how-to-step-1\"><strong class=\"schema-how-to-step-name\">Taba\u011f\u0131n Haz\u0131rlanmas\u0131 ve \u00d6n Is\u0131tma<\/strong> <p class=\"schema-how-to-step-text\">PCBA iyice temizlenmeli ya da kesinlikle uyumlu bir \u201cno-clean\u201d ak\u0131 sistemi kullan\u0131lmal\u0131d\u0131r; zira reaksiyona girmemi\u015f ak\u0131 kal\u0131nt\u0131lar\u0131, k\u0131lcal ak\u0131\u015f\u0131 ciddi \u015fekilde engelleyebilir ve kimyasal yap\u0131\u015fmay\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde azaltabilir. Ard\u0131ndan t\u00fcm montaj, \u0131s\u0131t\u0131lm\u0131\u015f bir plakaya veya hat i\u00e7i \u0131s\u0131tma b\u00f6lgesine aktar\u0131l\u0131r. Alt dolgu re\u00e7inesinin viskozitesini yapay olarak d\u00fc\u015f\u00fcrmek i\u00e7in alt tabakan\u0131n \u00e7ok belirli bir s\u0131cakl\u0131\u011fa (genellikle 70\u00b0C ile 100\u00b0C aras\u0131nda) \u00f6nceden \u0131s\u0131t\u0131lmas\u0131 esast\u0131r; bu sayede re\u00e7ine, erken bir termoset sertle\u015fmesini tetiklemeden paketin alt\u0131na h\u0131zl\u0131 ve e\u015fit bir \u015fekilde akabilir.<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-2\"><strong class=\"schema-how-to-step-name\">Hassas Da\u011f\u0131t\u0131m<\/strong> <p class=\"schema-how-to-step-text\">\u00d6zel vidal\u0131 pompalar veya y\u00fcksek h\u0131zl\u0131 p\u00fcsk\u00fcrtme vanalar\u0131 ile donat\u0131lm\u0131\u015f son teknoloji otomatik s\u0131v\u0131 da\u011f\u0131t\u0131m ekipmanlar\u0131 kullan\u0131larak, BGA\u2019n\u0131n bir kenar\u0131 boyunca (L-deseni veya I-deseni) hassas ve mikro d\u00fczeyde hesaplanm\u0131\u015f bir hacimde alt dolgu malzemesi yerle\u015ftirilir. Malzemenin bile\u015fen kenar\u0131na temas etmesini sa\u011flamak ve kritik \u00f6neme sahip k\u0131lcal \u00e7ekilmeyi ba\u015flatmak i\u00e7in, da\u011f\u0131t\u0131m i\u011fnesinin Z ekseninde titizlikle konumland\u0131r\u0131lmas\u0131 gerekir; bu i\u015flem s\u0131ras\u0131nda kal\u0131pla fiziksel olarak \u00e7arp\u0131\u015f\u0131lmamal\u0131 veya kom\u015fu mikro bile\u015fenler kirletilmemelidir.<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-3\"><strong class=\"schema-how-to-step-name\">K\u0131lcal Ak\u0131\u015f Bekleme S\u00fcresi<\/strong> <p class=\"schema-how-to-step-text\">D\u00f6k\u00fcld\u00fckten sonra, do\u011fal k\u0131lcal hareketin s\u0131v\u0131y\u0131 paket matrisinin alt\u0131na sorunsuz bir \u015fekilde tamamen \u00e7ekebilmesi i\u00e7in montaj, \u00f6n \u0131s\u0131tma s\u0131cakl\u0131\u011f\u0131nda s\u00fcrekli olarak tutulur. Bunun i\u00e7in gereken s\u00fcre, b\u00fcy\u00fck \u00f6l\u00e7\u00fcde bile\u015fen boyutlar\u0131na, bump aral\u0131k yo\u011funlu\u011funa, Z ekseni bo\u015fluk y\u00fcksekli\u011fine ve malzemenin \u00f6zg\u00fcl viskozitesine ba\u011fl\u0131d\u0131r. Bu kritik ad\u0131m\u0131 aceleye almak, ka\u00e7\u0131n\u0131lmaz olarak kal\u0131b\u0131n alt\u0131nda hava cepleri (bo\u015fluklar) olu\u015fmas\u0131na neden olur; bunlar sonraki termal d\u00f6ng\u00fcler s\u0131ras\u0131nda \u015fiddetli bir \u015fekilde genle\u015ferek lehim birle\u015fim yerlerinin d\u0131\u015far\u0131 \u00e7\u0131kmas\u0131na veya bile\u015fenlerin tabakalar\u0131n\u0131n ayr\u0131lmas\u0131na yol a\u00e7abilir.<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-4\"><strong class=\"schema-how-to-step-name\">Fileto Denetimi<\/strong> <p class=\"schema-how-to-step-text\">Ak\u0131\u015f\u0131n tamamland\u0131\u011f\u0131 kabul edildikten sonra, alt dolgu bile\u015fenin z\u0131t taraflar\u0131ndan d\u0131\u015far\u0131 \u00e7\u0131kmal\u0131 ve kesintisiz, kusursuz bir i\u00e7b\u00fckey dolgu olu\u015fturmal\u0131d\u0131r. Bu dolgu, \u015fiddetli mekanik darbelere kar\u015f\u0131 hayati \u00f6nem ta\u015f\u0131yan yap\u0131sal destek sa\u011flar. Otomatik Optik Muayene (AOI) veya y\u00fcksek b\u00fcy\u00fctme oranl\u0131 manuel g\u00f6rsel muayene, \u00e7evreleyen pedlere a\u015f\u0131r\u0131 malzeme s\u0131z\u0131nt\u0131s\u0131 olmadan eksiksiz ve homojen bir filetin varl\u0131\u011f\u0131n\u0131 do\u011frulamak i\u00e7in kullan\u0131l\u0131r.<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-5\"><strong class=\"schema-how-to-step-name\">Termal Sertle\u015ftirme<\/strong> <p class=\"schema-how-to-step-text\">Daha sonra, tamamen yetersiz doldurulmu\u015f PCBA, dikkatli bir \u015fekilde bir toplu konveksiyon f\u0131r\u0131n\u0131na veya hat i\u00e7i k\u00fcrleme f\u0131r\u0131n\u0131na aktar\u0131l\u0131r. Montaj, karma\u015f\u0131k polimer zincirlerini g\u00fcvenli bir \u015fekilde \u00e7apraz ba\u011flamak ve epoksiyi nihai haline sertle\u015ftirmek i\u00e7in s\u0131k\u0131 bir \u015fekilde kontrol edilen bir termal profile (\u00f6rne\u011fin, 30 ila 45 dakika boyunca 150 \u00b0C) tabi tutulur. Tamamen k\u00fcrlenmi\u015f matris i\u00e7inde mikroskobik i\u00e7 bo\u015fluklar olu\u015fturabilecek, hapsolmu\u015f u\u00e7ucu maddelerin h\u0131zl\u0131 bir \u015fekilde gaz sal\u0131n\u0131m\u0131n\u0131 \u00f6nlemek i\u00e7in s\u0131cakl\u0131k art\u0131\u015f h\u0131z\u0131na \u00f6zen g\u00f6sterilmelidir.<\/p> <\/li><\/ol><\/div><p>Do\u011fru uygulama y\u00f6ntemi, malzeme se\u00e7imi kadar \u00f6nemlidir. Yetersiz i\u015fleme parametreleri, kolayca ciddi bo\u015fluk olu\u015fumuna, bile\u015fenlerin tam olarak kaplanamamas\u0131na ve ak\u0131 uyumsuzlu\u011funa yol a\u00e7abilir; bu da alt dolgu uygulamas\u0131n\u0131n ama\u00e7lanan faydalar\u0131n\u0131 tamamen ortadan kald\u0131r\u0131r.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Defect_Analysis_and_Reliability_Testing\"><\/span>Hata Analizi ve G\u00fcvenilirlik Testi<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Uygulama sonras\u0131nda, alt dolgu s\u00fcrecini do\u011frulamak i\u00e7in titiz bir kalite g\u00fcvencesi gereklidir. En yayg\u0131n kusur, bo\u015fluk olu\u015fumudur. Bo\u015fluklar, ciddi gerilim yo\u011funla\u015ft\u0131r\u0131c\u0131lar olarak i\u015flev g\u00f6r\u00fcr. Bir bo\u015fluk, lehim \u00e7\u0131k\u0131nt\u0131s\u0131n\u0131 \u00e7evreliyorsa, desteklenmeyen ba\u011flant\u0131 yorgunlu\u011fa kar\u015f\u0131 son derece savunmas\u0131z hale gelir ve bo\u015flu\u011fa nem girmesi korozyona yol a\u00e7abilir.<\/p>\n<p>Underfill, IC'nin alt\u0131nda gizli oldu\u011fu i\u00e7in g\u00f6rsel inceleme imk\u00e2ns\u0131zd\u0131r. M\u00fchendisler, underfill tabakas\u0131n\u0131 tahribats\u0131z bir \u015fekilde g\u00f6r\u00fcnt\u00fclemek i\u00e7in Taramal\u0131 Akustik Mikroskopi (C-SAM) y\u00f6ntemine ba\u015fvururlar. C-SAM, malzeme yo\u011funlu\u011fundaki de\u011fi\u015fiklikleri tespit etmek i\u00e7in y\u00fcksek frekansl\u0131 ultrasonik dalgalar kullan\u0131r ve hapsolmu\u015f hava ceplerini veya delaminasyon b\u00f6lgelerini net bir \u015fekilde ortaya \u00e7\u0131kar\u0131r. <strong>Hakk\u0131nda daha fazla bilgi edinin <a href=\"\/tr\/blog\/skew-compensation-fwe-pcb\/\">E\u011frilik D\u00fczeltmesi: PCIe Gen 6 i\u00e7in Fiber \u00d6rg\u00fc Etkisi (FWE) ve Uzunluk E\u015fle\u015ftirmesinin Y\u00f6netimi<\/a>.<\/strong><\/p>\n<p>Nihai \u00fcr\u00fcn do\u011frulamas\u0131 i\u00e7in, alt dolgu uygulanm\u0131\u015f montajlar JEDEC standartlar\u0131na uygun olarak zorlu g\u00fcvenilirlik testlerinden ge\u00e7irilir. Bu testler aras\u0131nda Termal \u015eok Testi (\u00f6rne\u011fin, -40 \u00b0C ile +125 \u00b0C aras\u0131nda h\u0131zl\u0131 d\u00f6ng\u00fc) ve ger\u00e7ek hayattaki darbeleri sim\u00fcle etmek amac\u0131yla yap\u0131lan y\u00fcksek h\u0131zland\u0131r\u0131lm\u0131\u015f D\u00fc\u015fme Testi yer al\u0131r; bu sayede alt dolgunun gerekli kullan\u0131m \u00f6mr\u00fc kriterlerini kar\u015f\u0131lad\u0131\u011f\u0131 garanti alt\u0131na al\u0131n\u0131r.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Advanced_Considerations_Reworkability_and_Flux_Compatibility\"><\/span>\u0130leri D\u00fczey Hususlar: Yeniden \u0130\u015flenebilirlik ve Ak\u0131 Uyumlulu\u011fu<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Tarihsel olarak, underfill uygulamas\u0131n\u0131n ba\u015far\u0131l\u0131 olmas\u0131, BGA\u2019n\u0131n devre kart\u0131na kal\u0131c\u0131 ve geri d\u00f6n\u00fc\u015f\u00fc olmayan bir \u015fekilde yap\u0131\u015fmas\u0131 anlam\u0131na geliyordu; bu da montaj sonras\u0131 d\u00fczeltme i\u015flemlerini fiziksel olarak imkans\u0131z hale getiriyordu. Bir bile\u015fen testten ge\u00e7emedi\u011finde, son derece pahal\u0131 olan PCBA\u2019n\u0131n tamam\u0131 hurdaya ayr\u0131lmak zorundayd\u0131. G\u00fcn\u00fcm\u00fczde kimya \u00fcreticileri, termal olarak yeniden i\u015flenebilir geli\u015fmi\u015f underfill'leri ba\u015far\u0131yla geli\u015ftirmi\u015ftir. Bu malzemeler, normal SMT yeniden ak\u0131\u015f profillerinin (\u00f6rne\u011fin, 220\u00b0C \u2013 260\u00b0C) \u00f6nemli \u00f6l\u00e7\u00fcde \u00fczerindeki s\u0131cakl\u0131klara maruz kald\u0131klar\u0131nda kas\u0131tl\u0131 olarak bozulup yap\u0131\u015fma g\u00fc\u00e7lerini kaybetmeleri i\u00e7in \u00f6zel olarak tasarlanm\u0131\u015ft\u0131r. D\u00fczeltme i\u015flemi s\u0131ras\u0131nda, lokalize ve son derece kontroll\u00fc \u0131s\u0131 uygulan\u0131r; bu sayede ar\u0131zal\u0131 bile\u015fen nazik\u00e7e kald\u0131r\u0131labilir ve bozunmu\u015f kalan alt dolgu maddesi, PCB bak\u0131r pedlerinden mekanik olarak kaz\u0131nabilir veya kimyasal olarak \u00e7\u00f6z\u00fclebilir.<\/p>\n<p>Bir di\u011fer son derece \u00f6nemli husus ise ak\u0131 uyumlulu\u011fudur. Standart, temizleme gerektirmeyen bir SMT i\u015flemi kullan\u0131ld\u0131\u011f\u0131nda, yeniden ak\u0131\u015f i\u015fleminden hemen sonra lehim ba\u011flant\u0131lar\u0131n\u0131n \u00e7evresinde zarars\u0131z ak\u0131 kal\u0131nt\u0131lar\u0131 kal\u0131r. Ancak, belirli bir alt dolgu kimyas\u0131, s\u00f6z konusu ak\u0131 kal\u0131nt\u0131s\u0131n\u0131n kimyasal bile\u015fimi ile uyumsuzsa, mikroskobik aray\u00fczlerde zay\u0131f yap\u0131\u015fma, zamanla lokalize delaminasyon veya hatta ciddi elektromigrasyon (dendrit b\u00fcy\u00fcmesi) sorunlar\u0131na yol a\u00e7abilir. Underfill'in, herhangi bir olumsuz uzun vadeli kimyasal etkile\u015fime yol a\u00e7madan ak\u0131 kal\u0131nt\u0131s\u0131n\u0131 temiz bir \u015fekilde kaps\u00fclledi\u011finden emin olmak i\u00e7in kapsaml\u0131 ampirik g\u00fcvenilirlik testleri ve uyumluluk de\u011ferlendirmeleri gereklidir.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions_FAQ\"><\/span>S\u0131k\u00e7a Sorulan Sorular (SSS)<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-1\"><strong class=\"schema-faq-question\">K\u0131lcal dolgu ile ak\u0131\u015fs\u0131z dolgu aras\u0131ndaki temel fark nedir?<\/strong> <p class=\"schema-faq-answer\">K\u0131lcal dolgu maddesi, SMT yeniden ak\u0131\u015f i\u015flemi tamamland\u0131ktan sonra dinamik olarak uygulan\u0131r; tamamen lehimlenmi\u015f bir bile\u015fenin alt\u0131na sorunsuz bir \u015fekilde akabilmesi i\u00e7in b\u00fcy\u00fck \u00f6l\u00e7\u00fcde d\u0131\u015f \u0131s\u0131ya ve do\u011fal k\u0131lcal etkiye dayan\u0131r. Ak\u0131\u015fs\u0131z alt dolgu, bile\u015fen yerle\u015ftirilmeden \u00f6nce do\u011frudan \u00e7\u0131plak kart \u00fczerine uygulan\u0131r ve hem lehimlemeyi kolayla\u015ft\u0131ran aktif bir ak\u0131 hem de standart lehim yeniden ak\u0131\u015f i\u015flemi s\u0131ras\u0131nda e\u015fzamanl\u0131 olarak sertle\u015fen yap\u0131sal bir kaps\u00fclleme maddesi g\u00f6revi g\u00f6r\u00fcr. K\u0131lcal alt dolgular, \u00f6nemli \u00f6l\u00e7\u00fcde daha y\u00fcksek silika dolgu maddesi i\u00e7eri\u011fi sayesinde genellikle \u00fcst\u00fcn ve uzun vadeli termomekanik koruma sa\u011flar.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-2\"><strong class=\"schema-faq-question\">Underfill uyguland\u0131ktan sonra bir BGA bile\u015feni yeniden i\u015flenebilir mi?<\/strong> <p class=\"schema-faq-answer\">Evet, ancak bu, orijinal montaj s\u0131ras\u0131nda \u00f6zel olarak form\u00fcle edilmi\u015f bir \u201cyeniden i\u015flenebilir alt dolgu\u201d malzemesinin kas\u0131tl\u0131 olarak kullan\u0131lm\u0131\u015f olmas\u0131 durumunda ge\u00e7erlidir. Bu ileri m\u00fchendislik \u00fcr\u00fcn\u00fc epoksiler, a\u015f\u0131r\u0131 y\u00fcksek s\u0131cakl\u0131klarda fiziksel olarak par\u00e7alan\u0131p ayr\u0131\u015facak \u015fekilde tasarlanm\u0131\u015ft\u0131r; bu sayede bile\u015fen dikkatli bir \u015fekilde \u00e7\u0131kar\u0131labilir ve alan yeni bir IC i\u00e7in haz\u0131rlanabilir. Standart, y\u00fcksek oranda \u00e7apraz ba\u011flanm\u0131\u015f ve yeniden i\u015flenemeyen alt dolgu malzemeleri, BGA\u2019y\u0131 fiilen tamamen kal\u0131c\u0131 hale getirir; yeniden i\u015fleme giri\u015fiminde bulunulmas\u0131, hassas bak\u0131r pedlerin PCB alt tabakas\u0131ndan kopmas\u0131na yol a\u00e7acakt\u0131r.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-3\"><strong class=\"schema-faq-question\">Dolgu maddesi i\u00e7eri\u011fi, alt dolgu performans\u0131n\u0131 nas\u0131l etkiler?<\/strong> <p class=\"schema-faq-answer\">\u00dcretici taraf\u0131ndan, termal genle\u015fme katsay\u0131s\u0131n\u0131 (CTE) \u00f6nemli \u00f6l\u00e7\u00fcde azaltmak ve alt dolgu malzemesinin Young mod\u00fcl\u00fcn\u00fc b\u00fcy\u00fck \u00f6l\u00e7\u00fcde art\u0131rmak amac\u0131yla dolgu maddesi (genellikle mikroskobik silika k\u00fcreleri) eklenir; bu sayede SMT ba\u011flant\u0131lar\u0131n\u0131 \u015fiddetli termal d\u00f6ng\u00fclere kar\u015f\u0131 koruma konusunda temel olarak daha etkili hale gelir. Ancak, y\u00fcksek dolgu maddesi i\u00e7eri\u011fi, do\u011fas\u0131 gere\u011fi k\u00fcrlenmemi\u015f re\u00e7inenin baz viskozitesini art\u0131r\u0131r; bu da k\u0131lcal ak\u0131\u015f\u0131 ciddi \u015fekilde engelleyebilir ve aral\u0131klar\u0131 dar, d\u00fc\u015f\u00fck stant-off mesafeli bile\u015fenlerde kullan\u0131m\u0131n\u0131 son derece zor hale getirebilir.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-4\"><strong class=\"schema-faq-question\">BGA alt dolgu malzemesinde bo\u015fluk olu\u015fumunun nedenleri nelerdir ve bu durum neden tehlikelidir?<\/strong> <p class=\"schema-faq-answer\">Bo\u015fluk olu\u015fumu (sertle\u015fmi\u015f epoksi i\u00e7indeki hapsolmu\u015f hava kabarc\u0131klar\u0131), yanl\u0131\u015f da\u011f\u0131t\u0131m \u015fekilleri (havan\u0131n ka\u00e7amadan hapsolmas\u0131), alt tabakan\u0131n yetersiz \u00f6n \u0131s\u0131t\u0131lmas\u0131, sertle\u015fme d\u00f6ng\u00fcs\u00fc s\u0131ras\u0131nda ak\u0131 gaz sal\u0131n\u0131m\u0131 veya malzemenin \u00e7ok h\u0131zl\u0131 sertle\u015ftirilmesi nedeniyle meydana gelebilir. Bo\u015fluklar, gerilimin odak noktas\u0131 g\u00f6revi g\u00f6rd\u00fckleri i\u00e7in son derece tehlikelidir. Bir bo\u015fluk, lehim \u00e7\u0131k\u0131nt\u0131s\u0131n\u0131n hemen yan\u0131nda bulunuyorsa, termal d\u00f6ng\u00fc s\u0131ras\u0131nda genle\u015fen hava, birle\u015fim noktas\u0131 \u00fczerinde yo\u011fun fiziksel bask\u0131 uygulayabilir; bu da erken mekanik k\u0131r\u0131lmaya veya lehimin bo\u015flu\u011fa zorla s\u0131k\u0131\u015fmas\u0131na yol a\u00e7abilir.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-5\"><strong class=\"schema-faq-question\">Bir PCBA \u00fczerindeki t\u00fcm BGA bile\u015fenleri i\u00e7in alt dolgu gerekli midir?<\/strong> <p class=\"schema-faq-answer\">Hay\u0131r. Alt dolgu genellikle \u00f6zellikle ince aral\u0131kl\u0131 BGA\u2019lar, hassas Wafer-Level Chip Scale Package (WLCSP) paketleri, son derece a\u011f\u0131r bile\u015fenler veya \u00f6nemli termal d\u00f6ng\u00fcye ya da s\u00fcrekli titre\u015fime maruz kalan ola\u011fan\u00fcst\u00fc zorlu ortamlarda \u00e7al\u0131\u015fan montajlar i\u00e7in ayr\u0131lm\u0131\u015ft\u0131r. Il\u0131ml\u0131 ve kontroll\u00fc t\u00fcketici ortamlar\u0131ndaki standart aral\u0131kl\u0131 BGA'lar genellikle alt dolgu gerektirmez; \u00e7\u00fcnk\u00fc lehim ba\u011flant\u0131lar\u0131n\u0131n kendileri, k\u00fc\u00e7\u00fck \u00e7apl\u0131, g\u00fcnl\u00fck termomekanik gerilmeleri ba\u015far\u0131yla kar\u015f\u0131layacak yeterli esnekli\u011fe sahiptir.<\/p> <\/div> <\/div>","protected":false},"excerpt":{"rendered":"<p>Introduction to BGA Underfill and PCBA Reliability As printed circuit board assemblies (PCBAs) continue to miniaturize and incorporate higher-density interconnects (HDI), the utilization of Ball Grid Array (BGA), Chip Scale Package (CSP), and Wafer-Level Chip Scale Package (WLCSP) components has become ubiquitous across the electronics manufacturing sector. While these packaging technologies offer superior electrical performance, [&hellip;]<\/p>","protected":false},"author":1,"featured_media":6451,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"BGA underfill","_yoast_wpseo_title":"BGA Underfill: Enhancing PCBA Reliability Against Mechanical Shock and Thermal Stress","_yoast_wpseo_metadesc":"An in-depth engineering guide on BGA underfill, exploring how capillary and no-flow underfill materials enhance PCBA reliability against thermal stress and mechanical shock.","footnotes":""},"categories":[108],"tags":[594],"class_list":["post-6268","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-bga-underfill"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>BGA Underfill: Enhancing PCBA Reliability Against Mechanical Shock and 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