{"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\/nl\/blog\/what-is-the-purpose-of-unfilled-solder-pads-on-a-pcb\/","title":{"rendered":"Wat is het doel van ongevulde soldeerpads op een printplaat?"},"content":{"rendered":"<p>Bij de productie <a href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/printed-circuit-board-pcb\/\">PCB<\/a> printplaten worden elektrische verbindingen tussen elektronische componenten en de printplaat tot stand gebracht door bedrading op het oppervlak van de printplaat aan te brengen, elektronische componenten te installeren en deze vervolgens vast te solderen. Goede verbindingen en de sterkte van soldeerverbindingen zijn cruciaal voor de normale werking van printplaten.<\/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-soldeerverbinding\" 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\">Inhoudsopgave<\/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\/nl\/blog\/what-is-the-purpose-of-unfilled-solder-pads-on-a-pcb\/#1_Design_Purposes_of_Unfilled_Solder_Joints\" >1. Ontwerpdoeleinden van ongevulde soldeerverbindingen<\/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\/nl\/blog\/what-is-the-purpose-of-unfilled-solder-pads-on-a-pcb\/#2_Electrical_Performance_Impact_Mechanisms\" >2. Elektrische prestatie be\u00efnvloedende mechanismen<\/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\/nl\/blog\/what-is-the-purpose-of-unfilled-solder-pads-on-a-pcb\/#3_Solder_Joint_Quality_Inspection_Techniques\" >3. Technieken voor kwaliteitsinspectie van soldeerverbindingen<\/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\/nl\/blog\/what-is-the-purpose-of-unfilled-solder-pads-on-a-pcb\/#4_Key_Process_Control_Parameters\" >4. Belangrijkste procescontroleparameters<\/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\/nl\/blog\/what-is-the-purpose-of-unfilled-solder-pads-on-a-pcb\/#Common_Issues_Solutions\" >Veelvoorkomende problemen en oplossingen<\/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. Ontwerpdoeleinden van ongevulde soldeerverbindingen<span class=\"ez-toc-section-end\"><\/span><\/h2><ul class=\"wp-block-list\"><li><strong>Testpunt functionaliteit<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Elektrisch testen: Blootliggende koperen gebieden dienen als testpunten voor oscilloscopen, vliegende sondetesters en andere soortgelijke apparaten.<\/li>\n\n<li>Procesverificatie: Post-reflow\/golfsolderen, testpunten valideren procesparameters.<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Speciale ontwerpvereisten<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Warmteafvoer: Blootgesteld koper in sporen met hoge stroomsterkte verbetert de thermische prestaties (berekeningen voor stroomvoercapaciteit vereist).<\/li>\n\n<li>RF-debuggen: Ongemaskeerde impedantietestpunten voor hoogfrequente schakelingen (vergulden aanbevolen).<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Electrical_Performance_Impact_Mechanisms\"><\/span>2. Elektrische prestatie be\u00efnvloedende mechanismen<span class=\"ez-toc-section-end\"><\/span><\/h2><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Impact Dimensie<\/th><th>Mechanisme<\/th><th>Typisch scenario<\/th><\/tr><\/thead><tbody><tr><td>Contactweerstand<\/td><td>Oxidelagen verhogen impedantie 3-5x<\/td><td>Overmatige spanningsval in stroomcircuits<\/td><\/tr><tr><td>Hoogfrequent signaalverlies<\/td><td>Impedantie mismatches veroorzaken retourverlies (&gt;3dB)<\/td><td>Hogere bitfoutpercentages in 5G-modules<\/td><\/tr><tr><td>Thermische betrouwbaarheid<\/td><td>Hogere thermische weerstand verhoogt de junctietemperaturen met 10-15\u00b0C<\/td><td>Voortijdige uitval in vermogens-MOSFET's<\/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-soldeerverbinding\" 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. Technieken voor kwaliteitsinspectie van soldeerverbindingen<span class=\"ez-toc-section-end\"><\/span><\/h2><ul class=\"wp-block-list\"><li><strong>Oplossingen van industri\u00eble kwaliteit<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>3D SPI: Diktemeting soldeerpasta (nauwkeurigheid \u00b15 \u03bcm)<\/li>\n\n<li>Microfocus r\u00f6ntgenstraal: Detecteert BGA-leemtes op 0,2 \u03bcm-niveau (99,7% detectiesnelheid)<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Kosteneffectieve oplossingen<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Penetratie met rode kleurstof: Goedkope scheurdetectie (besparing 80%)<\/li>\n\n<li>Thermische beeldvorming: Identificeert koude verbindingen via temperatuurafwijkingen<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Key_Process_Control_Parameters\"><\/span>4. Belangrijkste procescontroleparameters<span class=\"ez-toc-section-end\"><\/span><\/h2><p><strong>Reflow-soldeerprofiel (voorbeeld van een loodvrij proces)<\/strong><\/p><ul class=\"wp-block-list\"><li>Voorverwarmen: 150\u00b0C (1-2\u00b0C\/s hellingssnelheid)<\/li>\n\n<li>Inweektijd: 90 sec (\u00b15\u00b0C stabilisatie)<\/li>\n\n<li>Piektemperatuur: 245\u00b0C (duur 30-45 sec)<\/li>\n\n<li>Koelsnelheid: 3\u00b0C\/s (voorkomt thermische schok)<\/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-soldeerverbinding\" 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>Veelvoorkomende problemen en oplossingen<span class=\"ez-toc-section-end\"><\/span><\/h2><p><strong>V1: Problemen met signaalintegriteit in hoogfrequente schakelingen - vermoedelijk ongevulde soldeerverbindingen?<\/strong><br>A1: Gebruik TDR (Time-Domain Reflectometry) om impedantiediscontinu\u00efteiten te lokaliseren en controleer dit vervolgens met r\u00f6ntgenstraling. Aanbevelingen:<\/p><ul class=\"wp-block-list\"><li>Gebruik soldeerlegeringen met laag verlies (bijvoorbeeld SnAgCu).<\/li>\n\n<li>Ontwerp testpunten met impedantiecompensatie<\/li><\/ul><p><strong>V2: Hoe kunnen koude soldeerverbindingen in massaproductie snel worden aangepakt?<\/strong><br>A2: Een drietrapsregelmethode implementeren:<\/p><ol class=\"wp-block-list\"><li>Stenciloptimalisatie: Vergroot diafragmagrootte met 5%<\/li>\n\n<li>Stikstofatmosfeer: Houd O\u2082-niveaus &lt;1000ppm<\/li>\n\n<li>Inline AOI: Inspectie van zijaanzicht toevoegen<\/li><\/ol><p><strong>V3: Blootgesteld koper oxideert in vochtige omgevingen, wat slecht contact veroorzaakt?<\/strong><br>A3: Beschermingsstrategie op drie niveaus:<\/p><ul class=\"wp-block-list\"><li>Primair: Nikkel ondergedompeld goud (ENIG)<\/li>\n\n<li>Secundair: Plaatselijke conforme coating (UV-uithardende hars)<\/li>\n\n<li>Tertiair: IP67-waterdicht ontwerp<\/li><\/ul><p><\/p>","protected":false},"excerpt":{"rendered":"<p>De ontwerpdoeleinden, gevolgen voor de elektrische prestaties en inspectiemethoden van ongevulde soldeerpads (blootliggende koperen gebieden) op PCB's, met belangrijke kennispunten zoals testpuntfuncties, risico's voor signaalintegriteit en r\u00f6ntgeninspectietechnologie, voldoen aan industrienormen zoals IPC-610 en bieden hulp bij PCB-ontwerp- en productieprocessen.<\/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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