{"id":3689,"date":"2025-07-26T08:19:00","date_gmt":"2025-07-26T00:19:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=3689"},"modified":"2025-07-25T11:20:00","modified_gmt":"2025-07-25T03:20:00","slug":"what-is-the-purpose-of-unfilled-solder-pads-on-a-pcb","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/sv\/blog\/what-is-the-purpose-of-unfilled-solder-pads-on-a-pcb\/","title":{"rendered":"Vad \u00e4r syftet med ofyllda l\u00f6dkuddar p\u00e5 ett m\u00f6nsterkort?"},"content":{"rendered":"<p>Vid tillverkning <a href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/printed-circuit-board-pcb\/\">KRETSKORT<\/a> kretskort uppn\u00e5s elektriska anslutningar mellan elektroniska komponenter och kretskortet genom att l\u00e4gga ut ledningar p\u00e5 kretskortets yta, installera elektroniska komponenter och sedan l\u00f6da dem p\u00e5 plats. Bra anslutningar och h\u00e5llfastheten i l\u00f6dfogarna \u00e4r avg\u00f6rande f\u00f6r kretskortens normala funktion.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/PCB-solder-joint-1.jpg\" alt=\"PCB-l\u00f6dfog\" class=\"wp-image-3690\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/PCB-solder-joint-1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/PCB-solder-joint-1-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/PCB-solder-joint-1-18x12.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\">Inneh\u00e5llsf\u00f6rteckning<\/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\/sv\/blog\/what-is-the-purpose-of-unfilled-solder-pads-on-a-pcb\/#1_Design_Purposes_of_Unfilled_Solder_Joints\" >1. Konstruktions\u00e4ndam\u00e5l f\u00f6r ofyllda l\u00f6dfogar<\/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\/sv\/blog\/what-is-the-purpose-of-unfilled-solder-pads-on-a-pcb\/#2_Electrical_Performance_Impact_Mechanisms\" >2. Mekanismer f\u00f6r p\u00e5verkan p\u00e5 elektrisk prestanda<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/what-is-the-purpose-of-unfilled-solder-pads-on-a-pcb\/#3_Solder_Joint_Quality_Inspection_Techniques\" >3. Tekniker f\u00f6r kvalitetsinspektion av l\u00f6dfogar<\/a><\/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\/sv\/blog\/what-is-the-purpose-of-unfilled-solder-pads-on-a-pcb\/#4_Key_Process_Control_Parameters\" >4. Viktiga parametrar f\u00f6r processtyrning<\/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\/sv\/blog\/what-is-the-purpose-of-unfilled-solder-pads-on-a-pcb\/#Common_Issues_Solutions\" >Vanliga problem och l\u00f6sningar<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Design_Purposes_of_Unfilled_Solder_Joints\"><\/span>1. Konstruktions\u00e4ndam\u00e5l f\u00f6r ofyllda l\u00f6dfogar<span class=\"ez-toc-section-end\"><\/span><\/h2><ul class=\"wp-block-list\"><li><strong>Testpunktens funktionalitet<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Elektrisk testning: Exponerade kopparomr\u00e5den fungerar som testpunkter f\u00f6r oscilloskop, testare med flygande prober och andra liknande enheter.<\/li>\n\n<li>Verifiering av processen: Testpunkter efter \u00e5terfl\u00f6de\/v\u00e5gl\u00f6dning validerar processparametrar.<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>S\u00e4rskilda konstruktionskrav<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>V\u00e4rmeavledning: Exponerad koppar i str\u00f6mf\u00f6rande sp\u00e5r f\u00f6rb\u00e4ttrar den termiska prestandan (kr\u00e4ver ber\u00e4kningar av str\u00f6mf\u00f6rande kapacitet).<\/li>\n\n<li>RF-fels\u00f6kning: Omaskerade impedans-testpunkter f\u00f6r h\u00f6gfrekventa kretsar (guldpl\u00e4tering rekommenderas).<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Electrical_Performance_Impact_Mechanisms\"><\/span>2. Mekanismer f\u00f6r p\u00e5verkan p\u00e5 elektrisk prestanda<span class=\"ez-toc-section-end\"><\/span><\/h2><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>P\u00e5verkan Dimension<\/th><th>Mekanism<\/th><th>Typiskt scenario<\/th><\/tr><\/thead><tbody><tr><td>Kontaktmotst\u00e5nd<\/td><td>Oxidskikt \u00f6kar impedansen 3-5 g\u00e5nger<\/td><td>\u00d6verdrivet sp\u00e4nningsfall i str\u00f6mkretsar<\/td><\/tr><tr><td>H\u00f6gfrekvent signalf\u00f6rlust<\/td><td>Missanpassning av impedans orsakar returf\u00f6rlust (&gt;3dB)<\/td><td>\u00d6kade bitfelsfrekvenser i 5G-moduler<\/td><\/tr><tr><td>Termisk tillf\u00f6rlitlighet<\/td><td>H\u00f6gre v\u00e4rmemotst\u00e5nd h\u00f6jer f\u00f6rbindningstemperaturen med 10-15\u00b0C<\/td><td>F\u00f6r tidigt fel i effekt-MOSFET:er<\/td><\/tr><\/tbody><\/table><\/figure><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/PCB-solder-joint-3.jpg\" alt=\"PCB-l\u00f6dfog\" class=\"wp-image-3691\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/PCB-solder-joint-3.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/PCB-solder-joint-3-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/PCB-solder-joint-3-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Solder_Joint_Quality_Inspection_Techniques\"><\/span>3. Tekniker f\u00f6r kvalitetsinspektion av l\u00f6dfogar<span class=\"ez-toc-section-end\"><\/span><\/h2><ul class=\"wp-block-list\"><li><strong>Industriella l\u00f6sningar<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>3D SPI: M\u00e4tning av l\u00f6dpastans tjocklek (\u00b15 \u03bcm noggrannhet)<\/li>\n\n<li>Mikrofokuserad r\u00f6ntgen: Detekterar BGA-h\u00e5lrum p\u00e5 0,2 \u03bcm-niv\u00e5 (99,7% detekteringsgrad)<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Kostnadseffektiva l\u00f6sningar<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Penetration med r\u00f6d f\u00e4rg: Sprickdetektering till l\u00e5g kostnad (80% besparingar)<\/li>\n\n<li>Termisk bildbehandling: Identifierar kalla fogar via temperaturavvikelser<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Key_Process_Control_Parameters\"><\/span>4. Viktiga parametrar f\u00f6r processtyrning<span class=\"ez-toc-section-end\"><\/span><\/h2><p><strong>Profil f\u00f6r omsm\u00e4ltningsl\u00f6dning (exempel p\u00e5 blyfri process)<\/strong><\/p><ul class=\"wp-block-list\"><li>F\u00f6rv\u00e4rmning: 150\u00b0C (1-2\u00b0C\/s ramphastighet)<\/li>\n\n<li>Bl\u00f6tl\u00e4ggningstid: 90 sek (\u00b15\u00b0C stabilisering)<\/li>\n\n<li>Topptemperatur: 245\u00b0C (30-45 sekunders varaktighet)<\/li>\n\n<li>Nedkylningshastighet: 3\u00b0C\/s (f\u00f6rhindrar termisk chock)<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/PCB-solder-joint-2.jpg\" alt=\"PCB-l\u00f6dfog\" class=\"wp-image-3692\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/PCB-solder-joint-2.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/PCB-solder-joint-2-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/PCB-solder-joint-2-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Issues_Solutions\"><\/span>Vanliga problem och l\u00f6sningar<span class=\"ez-toc-section-end\"><\/span><\/h2><p><strong>F1: Problem med signalintegritet i h\u00f6gfrekventa kretsar - misst\u00e4nker man ofyllda l\u00f6dfogar?<\/strong><br>A1: Anv\u00e4nd Time-Domain Reflectometry (TDR) f\u00f6r att lokalisera impedansdiskontinuiteter och verifiera sedan med r\u00f6ntgen. Rekommendationer:<\/p><ul class=\"wp-block-list\"><li>Anv\u00e4nd l\u00f6dlegeringar med l\u00e5g f\u00f6rlust (t.ex. SnAgCu)<\/li>\n\n<li>Utforma testpunkter med impedanskompensation<\/li><\/ul><p><strong>Q2: Hur kan man snabbt \u00e5tg\u00e4rda kalla l\u00f6dfogar i massproduktion?<\/strong><br>A2: Implementera en trestegs kontrollmetod:<\/p><ol class=\"wp-block-list\"><li>Optimering av stencil: \u00d6ka bl\u00e4ndarstorleken med 5%<\/li>\n\n<li>Kv\u00e4veatmosf\u00e4r: Bibeh\u00e5lla O\u2082-niv\u00e5er &lt;1000ppm<\/li>\n\n<li>Inline AOI: L\u00e4gg till inspektion av sidovy<\/li><\/ol><p><strong>F3: Oxidation av exponerad koppar i fuktiga milj\u00f6er, vilket orsakar d\u00e5lig kontakt?<\/strong><br>A3: Strategi f\u00f6r skydd i tre steg:<\/p><ul class=\"wp-block-list\"><li>Prim\u00e4r: Elektrol\u00f6s nickelimmersionsguld (ENIG)<\/li>\n\n<li>Sekund\u00e4rt: Lokal konform bel\u00e4ggning (UV-h\u00e4rdande harts)<\/li>\n\n<li>Terti\u00e4r: IP67-klassad vattent\u00e4t design<\/li><\/ul><p><\/p>","protected":false},"excerpt":{"rendered":"<p>Design\u00e4ndam\u00e5l, p\u00e5verkan p\u00e5 elektrisk prestanda och inspektionsmetoder f\u00f6r ofyllda l\u00f6dkuddar (exponerade kopparomr\u00e5den) p\u00e5 m\u00f6nsterkort, som t\u00e4cker viktiga kunskapspunkter som testpunktsfunktioner, signalintegritetsrisker och r\u00f6ntgeninspektionsteknik, \u00f6verensst\u00e4mmer med industristandarder som IPC-610 och ger st\u00f6d f\u00f6r m\u00f6nsterkortsdesign och tillverkningsprocesser.<\/p>","protected":false},"author":1,"featured_media":3693,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[109],"tags":[331],"class_list":["post-3689","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faq","tag-pcb-solder-joint"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is the purpose of unfilled solder pads on a PCB? 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