{"id":2632,"date":"2025-06-13T05:37:39","date_gmt":"2025-06-13T05:37:39","guid":{"rendered":"https:\/\/blogs.lcsc.com\/blog\/?p=2632"},"modified":"2025-08-05T07:31:25","modified_gmt":"2025-08-05T07:31:25","slug":"double-sided-pcb-assembly-preventing-component-detachment","status":"publish","type":"post","link":"https:\/\/blogs.lcsc.com\/blog\/double-sided-pcb-assembly-preventing-component-detachment\/","title":{"rendered":"Double-Sided PCB Assembly: Preventing Component Detachment"},"content":{"rendered":"<p><span data-font-family=\"default\">In PCBA manufacturing, preventing large components from falling off during the second reflow soldering process of double-sided PCB assembly is a persistent challenge for engineers. Why do some components stay in place while others drop off? What are the underlying technical principles, and how can we improve reflow soldering stability? <\/span><span data-font-family=\"default\">This article explores the science behind component retention and offers practical solutions for more reliable PCBA production.<\/span><\/p>\n<div class=\"document\">\n<div class=\"section\">\n<figure style=\"width: 402px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" id=\"fd7e638a\" class=\"\" src=\"https:\/\/wdcdn.qpic.cn\/MTY4ODg1ODMyODUxOTAwNg_713147_atYe5mROxkGRtI37_1749782730?w=512&amp;h=340&amp;type=image\/jpeg\" alt=\"large components on the PCB\" width=\"402\" height=\"267\" \/><figcaption class=\"wp-caption-text\">large components on the PCB (Image source: online)<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<h2><b><span data-font-family=\"default\">Understanding the Double-Sided PCB Assembly Process<\/span><\/b><\/h2>\n<p><span data-font-family=\"default\">A double-sided PCB features electronic components on both sides, including surface-mount devices (<a href=\"https:\/\/blogs.lcsc.com\/blog\/understanding-surface-mount-device-smd-in-modern-electronics\/\">SMD<\/a>s) such as resistors, capacitors, and LEDs, as well as through-hole components like connectors. The typical assembly process follows these steps:<\/span><\/p>\n<ul>\n<li><b><span data-font-family=\"default\">First Side Soldering:<\/span><\/b><\/li>\n<\/ul>\n<p style=\"padding-left: 40px;\"><span data-font-family=\"default\">The lighter and smaller SMDs are soldered first to minimize the risk of detachment during the second reflow.<\/span><\/p>\n<ul>\n<li><b><span data-font-family=\"default\">Second Side Soldering:<\/span><\/b><\/li>\n<\/ul>\n<p style=\"padding-left: 40px;\"><span data-font-family=\"default\">Where larger or heavier components, such as connectors, are soldered.<\/span><\/p>\n<p><span data-font-family=\"default\">If heavy components are soldered first, they may face downward during the second reflow cycle. The high temperatures could re-melt the solder joints, and gravity may cause the components to detach, increasing the defect rate.<\/span><\/p>\n<div class=\"document\">\n<div class=\"section\">\n<figure style=\"width: 400px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" id=\"7364771e\" class=\"\" src=\"https:\/\/wdcdn.qpic.cn\/MTY4ODg1ODMyODUxOTAwNg_451514_pn-1ipSyqUnvyzzy_1749782730?w=572&amp;h=380&amp;type=image\/jpeg\" alt=\"Small components on the first side of double-sided PCBA and heavy components on the opposite side\" width=\"400\" height=\"266\" \/><figcaption class=\"wp-caption-text\">Small components on the first side of double-sided PCBA and heavy components on the opposite side (Image source: online)<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<h2><b><span data-font-family=\"default\">The Science Behind Component Retention in Reflow Soldering<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"default\">The shift of Solder Melting Point<\/span><\/b><\/h3>\n<p><span data-font-family=\"default\">Lead-free solder pastes, such as SAC305, have an initial melting point of 217\u00b0C. However, after the first reflow, the solder alloy composition slightly changes, often increasing the melting point to 220\u00b0C or higher. This means that even if the oven temperature remains the same during the second reflow, the first-side solder joints become more resistant to re-melting, improving component stability.<\/span><\/p>\n<h3><b><span data-font-family=\"default\">Surface Tension of Molten Solder<\/span><\/b><\/h3>\n<p><span data-font-family=\"default\">Surface tension forms when solder is molten. Small or lightweight components benefit from this force, which helps keep them in place. In contrast, larger or heavier components have a downward force due to gravity, making them more prone to detachment, even if their solder joints do not completely melt.<\/span><\/p>\n<h3><b><span data-font-family=\"default\">Oxide Film and Flux Effects<\/span><\/b><\/h3>\n<p><span data-font-family=\"default\">Solder joints form a thin oxide layer after reflow, enhancing structural stability. Additionally, flux evaporation during the first reflow reduces the likelihood of re-melting in the second reflow process.<\/span><\/p>\n<div data-version=\"3.0.0\" data-hash=\"d41d8cd98f00b204e9800998ecf8427e\"><\/div>\n<div class=\"document\">\n<div class=\"section\">\n<figure style=\"width: 523px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" id=\"adfb9036\" class=\"\" src=\"https:\/\/wdcdn.qpic.cn\/MTY4ODg1ODMyODUxOTAwNg_746661_83RBGe4PXHfYA9rp_1749782730?w=900&amp;h=432&amp;type=image\/png\" alt=\"reflow soldering profile curve for PCBA process\" width=\"523\" height=\"251\" \/><figcaption class=\"wp-caption-text\">reflow soldering profile curve for PCBA process (Image source: online)<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<h2><b><span data-font-family=\"default\">How to Prevent Component Detachment from <\/span><\/b><b><span data-font-family=\"default\">Double-Sided PCB Assembly<\/span><\/b><b><span data-font-family=\"default\">?<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"default\">Optimize Assembly Order, Process, and Equipment<\/span><\/b><\/h3>\n<ul>\n<li><span data-font-family=\"default\">Follow the principle of &#8220;light components first, heavy components last&#8221; to ensure the first-side components remain stable during the second reflow.<\/span><\/li>\n<li><span data-font-family=\"default\">Use advanced SMT equipment to ensure evenly heating and minimize the risk of component movement.<\/span><\/li>\n<li><span data-font-family=\"default\">Select high-performance solder paste, which alloy material with a suitable melting point should be chosen based on components, to improve joint reliability.<\/span><\/li>\n<\/ul>\n<h3><b><span data-font-family=\"default\">Temperature Profile &amp; Pad Design Optimization<\/span><\/b><\/h3>\n<ul>\n<li><span data-font-family=\"default\">Precisely control the reflow temperature profile to prevent excessive heat from re-melting first-side solder joints.<\/span><\/li>\n<li><span data-font-family=\"default\">Optimize pad size and solder volume to enhance mechanical strength of solder joints.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"default\">Key Factors Affecting Stability<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"default\">Component Weight vs. Solder Joint Support<\/span><\/b><\/h3>\n<ul>\n<li><span data-font-family=\"default\">The risk of detachment increases with component weight and decreases with larger solder pad areas.<\/span><\/li>\n<li><span data-font-family=\"default\">Engineers can mitigate this risk by adjusting pad dimensions or choosing alternative, lighter components when possible. For example, lightweight chip capacitors and resistors remain stable during the second reflow due to strong surface tension and less gravitational pull.<\/span><\/li>\n<\/ul>\n<h3><b><span data-font-family=\"default\">Synergy Between Flux and Solder Performance<\/span><\/b><\/h3>\n<ul>\n<li><span data-font-family=\"default\">Since solder melting points increase by 5\u201310\u00b0C after the first reflow, small components typically stay in place during the second heating cycle.<\/span><\/li>\n<li><span data-font-family=\"default\">However, if the oven temperature is set too high, first-side solder joints may re-melt, leading to component detachment.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"default\">Case Study: RK3566 Linux Development Board<\/span><\/b><\/h2>\n<p><span data-font-family=\"default\">An example is the <\/span><a href=\"https:\/\/www.lcsc.com\/product-detail\/Development-Boards-Kits_LCSC-boards-LCTSPI-RK3566-2G-16G_C19273641.html\"><span data-font-family=\"default\">RK3566 Linux Development Board | Available on LCSC<\/span><\/a><span data-font-family=\"default\">. This PCB features large surface-mounted connectors, including USB 2.0 ports, HDMI interfaces, and SMD pin headers\u2014all of which have relative heavy weight.<\/span><\/p>\n<p><span data-font-family=\"default\">To prevent detachment, heavy components are placed on the second soldering side. This ensures that the previously soldered components are not exposed to excessive gravitational force and the risk of re-melting.<\/span><\/p>\n<p><span data-font-family=\"default\">This strategic placement improves manufacturing efficiency and yield rates, ensuring the assembly quality of components.<\/span><\/p>\n<div class=\"document\">\n<div class=\"section\">\n<figure style=\"width: 453px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" id=\"51928b11\" class=\"\" src=\"https:\/\/wdcdn.qpic.cn\/MTY4ODg1ODMyODUxOTAwNg_711172_gDXs5WSrbrrjNOwp_1749782730?w=2160&amp;h=1207&amp;type=image\/jpeg\" alt=\"RK3566 Linux development board with large components arranged on the second side for optimized reflow soldering\" width=\"453\" height=\"253\" \/><figcaption class=\"wp-caption-text\">RK3566 Linux development board with large components arranged on the second side for optimized reflow soldering (Image source: online)<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<h3><b><span data-font-family=\"default\">Get Reliable PCBA Assembly with <a href=\"https:\/\/www.lcsc.com\/\">LCSC<\/a><\/span><\/b><\/h3>\n<p><span data-font-family=\"default\">Need high-quality PCBA manufacturing with on-site warehousing of 600,000+ SKUs? <\/span><\/p>\n<p><span data-font-family=\"default\">We offer double-sided PCB assembly with no limitations on PCB quantity, process, or component types. Enjoy fast, reliable service with real-time SMT ordering and instant pricing.<\/span><\/p>\n<div class=\"document\">\n<div class=\"section\">\n<figure style=\"width: 665px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" id=\"81cbe41c\" class=\"\" src=\"https:\/\/wdcdn.qpic.cn\/MTY4ODg1ODMyODUxOTAwNg_722210_lv-BFjlyCVgs3xi0_1749782730?w=1144&amp;h=432&amp;type=image\/png\" alt=\"Online PCBA order interface with real-time pricing and assembly preview\" width=\"665\" height=\"251\" \/><figcaption class=\"wp-caption-text\">Online PCBA order interface with real-time pricing and assembly preview (Image source: online)<\/figcaption><\/figure>\n<p><strong><em>Some images are sourced online. Please contact us for removal if any copyright concerns arise.<\/em><\/strong><\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>In PCBA manufacturing, preventing large components from falling off during the second reflow soldering process of double-sided PCB assembly is a persistent challenge for engineers. Why do some components stay in place while others drop off? What are the underlying technical principles, and how can we improve reflow soldering stability? This article explores the science [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":2639,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"iawp_total_views":6,"footnotes":""},"categories":[178],"tags":[181,155],"class_list":["post-2632","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pcb-assembly-testing-insights","tag-pcb","tag-pcba"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Double-Sided PCB Assembly: Preventing Component Detachment<\/title>\n<meta name=\"description\" content=\"Double-Sided PCB Assembly: expert tips to prevent component detachment, ensure reliable soldering on both sides, and boost 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