{"id":2066,"date":"2025-03-28T07:33:32","date_gmt":"2025-03-28T07:33:32","guid":{"rendered":"https:\/\/blogs.lcsc.com\/blog\/?p=2066"},"modified":"2025-08-05T07:53:31","modified_gmt":"2025-08-05T07:53:31","slug":"component-layout-best-practices-prevent-soldering-defects-and-boost-reliability","status":"publish","type":"post","link":"https:\/\/blogs.lcsc.com\/blog\/component-layout-best-practices-prevent-soldering-defects-and-boost-reliability\/","title":{"rendered":"Component Layout Best Practices: Prevent Soldering Defects and Boost Reliability"},"content":{"rendered":"<h2><b><span data-font-family=\"default\">Impact on Soldering Defects and Reliability<\/span><\/b><\/h2>\n<p><span data-font-family=\"default\">The placement of components on a <a href=\"https:\/\/blogs.lcsc.com\/blog\/printed-circuit-boards-pcbs-an-in-depth-overview\/\">PCB<\/a> directly affects soldering quality and product reliability. Improper placement or component layout, such as positioning components in areas with significant flexural stress or high <\/span><a href=\"https:\/\/blogs.lcsc.com\/blog\/understanding-mechanical-stress-from-atoms-to-skyscrapers\/\"><span data-font-family=\"default\">mechanical stress<\/span><\/a><span data-font-family=\"default\">, can lead to solder joint cracking or failure under stress.<\/span><\/p>\n<div class=\"document\">\n<div class=\"section\">\n<figure style=\"width: 399px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" id=\"fe57661a\" class=\"\" src=\"https:\/\/wdcdn.qpic.cn\/MTMxMDI3MDE5MzYxODU0MjQ_911391_-cM_9KgowHI4_fJ8_1736245687?w=850&amp;h=471\" alt=\"Stress contours of the whole PCB.\" width=\"399\" height=\"221\" \/><figcaption class=\"wp-caption-text\">Stress contours of the whole PCB. (Image source: online)<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<p><span data-font-family=\"default\">Components with high thermal capacity, if placed unevenly or on large PCBs prone to warping, may experience uneven heating during soldering, compromising soldering quality and long-term product stability.<\/span><\/p>\n<h3><b><span data-font-family=\"default\">High Thermal Capacity Components and Their Stability<\/span><\/b><\/h3>\n<p><span data-font-family=\"default\">For components with high thermal capacity, LCSC provides <\/span><a href=\"https:\/\/blogs.lcsc.com\/blog\/inductors-coils-and-chokes-whats-the-difference\/\"><span data-font-family=\"default\">inductors<\/span><\/a><span data-font-family=\"default\"> and <\/span><a href=\"https:\/\/blogs.lcsc.com\/blog\/capacitors-engineering-the-invisible-backbone-of-modern-electronics\/\"><span data-font-family=\"default\">capacitors<\/span><\/a><span data-font-family=\"default\"> with efficient heat dissipation, ensuring the thermal stability of the PCB during operation.<\/span><\/p>\n<p><span data-font-family=\"default\">Let&#8217;s take a look at a Samsung <\/span><span data-font-family=\"default\">surface mount <\/span><span data-font-family=\"default\">ceramic capacitor <\/span><a href=\"https:\/\/www.lcsc.com\/product-detail\/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT_Samsung-Electro-Mechanics-CL10C200JB8NNNC_C1648.html\"><span data-font-family=\"default\">CL10C200JB8NNNC C1648<\/span><\/a><span data-font-family=\"default\"> available at LCSC. It has a capacitance of 20pF, with a tolerance of \u00b15%, a rated voltage of 50V, and a C0G (also known as NP0) material. This material provides excellent temperature stability, maintaining almost constant capacitance values within a temperature range of -55\u00b0C to +125\u00b0C. C0G capacitors are ideal for applications that require high precision and stability. C0G is one of the most stable types of ceramic capacitors. Under identical operating conditions, the real tolerance of C0G capacitors is around 7%, while X7R capacitors exhibit a real tolerance of 33%.<\/span><\/p>\n<div class=\"document\">\n<div class=\"section\">\n<figure style=\"width: 181px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" id=\"997d0156\" src=\"https:\/\/wdcdn.qpic.cn\/MTMxMDI3MDE5MzYxODU0MjQ_768627_55qKiwEHx_h_eZH9_1736245687?w=900&amp;h=900\" alt=\"Samsung Electro-Mechanics CL10C200JB8NNNC C1648\" width=\"181\" height=\"181\" \/><figcaption class=\"wp-caption-text\">Samsung Electro-Mechanics CL10C200JB8NNNC C1648<\/figcaption><\/figure>\n<\/div>\n<h3><b><span data-font-family=\"default\">Capacitor Material and Performance Comparison<\/span><\/b><\/h3>\n<p><span data-font-family=\"default\">The performance of ceramic capacitors is closely related to their <\/span><span data-font-family=\"default\">dielectric material<\/span><span data-font-family=\"default\">. The type of <a href=\"https:\/\/blogs.lcsc.com\/blog\/dielectric-materials-demystified-the-hidden-force-powering-modern-electronics\/\">dielectric material<\/a> used in ceramic capacitors determines the stability of the capacitance and their suitability for different environments. <\/span><\/p>\n<ul>\n<li><span data-font-family=\"default\">Class I ceramic capacitors (such as <\/span><span data-font-family=\"default\">NPO<\/span><span data-font-family=\"default\">, C0G) exhibit the most stable capacitance values.<\/span><\/li>\n<li><span data-font-family=\"default\">Class II ceramic capacitors (such as X7R, X5R, Y5V, Z5U, etc.) experience larger fluctuations with temperature changes. <\/span><\/li>\n<\/ul>\n<p><span data-font-family=\"default\">For precision applications, Class I capacitors deliver more reliable performance.<\/span><\/p>\n<h2><b><span data-font-family=\"default\">Challenges in Reworkability<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"default\">Connector Spacing Issues<\/span><\/b><\/h3>\n<p><span data-font-family=\"default\">When connector spacing is too tight, the connectors, which are typically tall components, end up positioned closely together after assembly. During rework, this tight arrangement makes it difficult to use disassembly tools. For instance, when using tweezers or a desoldering tool to remove a connector, the limited space can make it hard to operate precisely, often causing the adjacent connectors to be bumped, which may result in pin deformation or damage to the solder joints. Additionally, when reinstalling a new <\/span><span data-font-family=\"default\">connector<\/span><span data-font-family=\"default\">, ensuring accurate placement becomes challenging due to the obstruction of adjacent connectors, making proper installation difficult.<\/span><\/p>\n<div class=\"document\">\n<div class=\"section\">\n<figure style=\"width: 339px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" id=\"854eeefa\" src=\"https:\/\/wdcdn.qpic.cn\/MTMxMDI3MDE5MzYxODU0MjQ_882998_JUZCN971nscr9pEu_1736245687?w=1020&amp;h=653\" alt=\"Tight arrangement lead to diffcult installation (poor component layout)\" width=\"339\" height=\"653\" \/><figcaption class=\"wp-caption-text\">Tight arrangement lead to diffcult installation (Image source: online)<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<h3><b><span data-font-family=\"default\">Improper component layout of large and small components<\/span><\/b><\/h3>\n<p><span data-font-family=\"default\">For example, placing large components (such as power inductors) above smaller components (like small-sized <\/span><a href=\"https:\/\/blogs.lcsc.com\/blog\/the-heartbeat-of-modern-technology-how-oscillators-keep-time-and-synchronize-our-world\/\"><span data-font-family=\"default\">oscillators<\/span><\/a><span data-font-family=\"default\">) can create difficulties during rework. To access the oscillator below, the large power inductor must first be removed. However, power inductors are typically heavy with thick leads, and during removal, external forces may be transferred to the oscillator, potentially causing it to be squeezed or bumped, resulting in damage. Moreover, the process of removing the large power inductor itself is complex, and the heat from soldering tools can affect nearby components, potentially damaging other unrelated parts.<\/span><\/p>\n<h3><b><span data-font-family=\"default\">Component Layout issues in high-density component areas<\/span><\/b><\/h3>\n<p><span data-font-family=\"default\">In PCB design, placing a large number of small surface-mount components (such as resistors or capacitors in 0402 or 0201 packages) in a confined area can cause challenges during rework. When one component fails and requires repair, the extremely small spacing in component layout between these components makes it difficult for soldering tools (like hot air guns or soldering irons) to target only the faulty component accurately. During rework, the adjacent components&#8217; solder joints may melt due to heat, causing component displacement or pin short-circuits. Additionally, after performing rework in such a high-density area, it becomes difficult to ensure the quality that the solder joints of other un-reworked components remain unaffected.<\/span><\/p>\n<h2><b><span data-font-family=\"default\">The Risk of Short Circuit<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"default\">Bridging Caused by Small Component Spacing\u00a0<\/span><\/b><\/h3>\n<p><span data-font-family=\"default\">During the SMT process, when the spacing between different components is less than 0.5mm, bridging is highly likely to occur. Due to the tight spacing, even slight design flaws in the stencil or minor issues during the printing process can cause solder bridges. This could lead to short circuits between different pins or components. This can severely impact the functionality of the product.<\/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=\"00cf8719\" src=\"https:\/\/wdcdn.qpic.cn\/MTMxMDI3MDE5MzYxODU0MjQ_929774_0SPzDXJl74Hy8mPF_1736245687?w=1016&amp;h=778\" alt=\"Bridging caused by small component spacing (poor component layout)\" width=\"400\" height=\"306\" \/><figcaption class=\"wp-caption-text\">Bridging caused by small component spacing (Image source: online)<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<h3><b><span data-font-family=\"default\">Improper Component Layout of Large Components<\/span><\/b><\/h3>\n<p><span data-font-family=\"default\">If we place two large components, with significant thickness, closely together, it can affect the pick-and-place operation. During the placement of the second component, the pick-and-place machine may collide with the first component, triggering a safety shutdown. This not only interrupts the production process, reducing efficiency, but may also damage both the machine and the components, increasing production costs. For double-sided PCBs with large components on both sides, the placement process could cause components on the opposite side to fall off. Therefore, it is recommended to place large components on the same side whenever possible, and the lighter components should be placed first during the assembly process to prevent detaching issues.<\/span><\/p>\n<div class=\"document\">\n<div class=\"section\">\n<figure style=\"width: 401px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" id=\"cd6e0a45\" class=\"\" src=\"https:\/\/wdcdn.qpic.cn\/MTMxMDI3MDE5MzYxODU0MjQ_156546_dgjKtU5xccDMLz_1_1736245688?w=1080&amp;h=711\" alt=\"Proper arrangement of large components on a PCB\" width=\"401\" height=\"264\" \/><figcaption class=\"wp-caption-text\">Proper arrangement of large components on a PCB (Image source: online)<\/figcaption><\/figure>\n<p><em>Some images are sourced online. Please contact us for removal if any copyright concerns arise.<\/em><\/p>\n<hr \/>\n<p><a href=\"https:\/\/www.lcsc.com\/customcables?utm_source=customcables&amp;utm_medium=navbar\">Custom Cables<\/a>: Save 50%+ Avg Cost By JST, Molex, TE Alternatives | Processing Fee Down to $1 Per Piece | No Minimum Order Quantity (MOQ) Required<\/p>\n<p><a href=\"https:\/\/www.lcsc.com\/pcba\">PCB &amp; PCBA<\/a>: New Customer Get Coupons Up to $125 | 1 &#8211; 32 Layers From $2 \/5pcs | PCB Assembly From $8 \/5pcs<\/p>\n<p><a href=\"https:\/\/www.lcsc.com\/front-panel\">Front Panels<\/a>: High-quality Front Panel Acrylic\/PET | Front Panel Order Up to 30% Off | Membrane Switch Available Soon<\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Impact on Soldering Defects and Reliability The placement of components on a PCB directly affects soldering quality and product reliability. Improper placement or component layout, such as positioning components in areas with significant flexural stress or high mechanical stress, can lead to solder joint cracking or failure under stress. Components with high thermal capacity, if [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":2367,"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":1,"footnotes":""},"categories":[176],"tags":[194,181,155],"class_list":["post-2066","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pcb-smt-basics","tag-component-layout","tag-pcb","tag-pcba"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Component Layout: Prevent Soldering Defects and Boost Reliability<\/title>\n<meta name=\"description\" content=\"Explore how PCB component layout impacts soldering quality and product reliability. 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