{"id":129991,"date":"2026-07-07T11:06:58","date_gmt":"2026-07-07T11:06:58","guid":{"rendered":"https:\/\/www.seeedstudio.com\/blog\/?p=129991"},"modified":"2026-07-07T11:07:01","modified_gmt":"2026-07-07T11:07:01","slug":"fusion-pcb-manufacturing-faq-hole-size-via-placement-solder-mask-and-board-edge-design","status":"publish","type":"post","link":"https:\/\/www.seeedstudio.com\/blog\/2026\/07\/07\/fusion-pcb-manufacturing-faq-hole-size-via-placement-solder-mask-and-board-edge-design\/","title":{"rendered":"PCB Manufacturing FAQ: Hole Size, Via Placement, Solder Mask, and Board Edge Design"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1030\" height=\"580\" src=\"https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/07\/image-1030x580.png\" alt=\"\" class=\"wp-image-129992\" srcset=\"https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/07\/image-1030x580.png 1030w, https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/07\/image-300x169.png 300w, https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/07\/image-768x432.png 768w, https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/07\/image-1536x864.png 1536w, https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/07\/image-32x18.png 32w, https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/07\/image-1024x576.png 1024w, https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/07\/image.png 1672w\" sizes=\"(max-width: 1030px) 100vw, 1030px\" \/><\/figure>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-1 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<h2 class=\"wp-block-heading\"><\/h2>\n<\/div>\n<\/div>\n\n\n\n<p>Small PCB layout details can cause big problems during fabrication and assembly.<\/p>\n\n\n\n<p>Incorrect hole sizes, vias placed too close to pads, unnecessary solder mask openings, or poor board-edge spacing may lead to soldering defects, weak connections, mechanical interference, or even redesign.<\/p>\n\n\n\n<p>\ud83e\udd20<strong>This FAQ covers several common PCB layout issues to check before sending your board files to production.<\/strong><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-2 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<h2 class=\"wp-block-heading\"><\/h2>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">1\ufe0f\u20e3What happens if hole size, pads, or spacing do not match the datasheet?<\/h2>\n\n\n\n<p>\ud83d\udd0d<strong>Common symptom:<\/strong> The drill hole is too small, the pad outer diameter is too small, or the hole spacing does not match the component lead spacing.<\/p>\n\n\n\n<p>\u203c\ufe0f<strong>Possible impact:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Through-hole components may be difficult to assemble.<\/li>\n\n\n\n<li>Soldering reliability may decrease, with insufficient annular ring or damaged plated holes.<\/li>\n\n\n\n<li>Rework rate may increase in volume production.<\/li>\n<\/ul>\n\n\n\n<p><strong>\ud83d\udca1Suggested fix:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the PCB layout recommended in the datasheet.<\/li>\n\n\n\n<li>For connectors, terminal blocks, switches, and other mechanically stressed parts, increase pad and mechanical strength where appropriate.<\/li>\n\n\n\n<li>Before fabrication, use a 1:1 printout or 3D assembly check to verify physical dimensions.<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-3 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<h2 class=\"wp-block-heading\"><\/h2>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">2\ufe0f\u20e3What happens if there are vias on pads?<\/h2>\n\n\n\n<p>\ud83d\udd0d<strong>Common symptom:<\/strong> Vias are placed in the middle or at the edge of pads for chip resistors\/capacitors, ICs, or connectors.<\/p>\n\n\n\n<p>\u203c\ufe0f<strong>Possible impact:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>During reflow, solder may drain into the via, causing insufficient solder, weak joints, or voids.<\/li>\n\n\n\n<li>Small components may shift or tombstone.<\/li>\n\n\n\n<li>BGA\/QFN components may suffer from voids, opens, or reliability issues.<\/li>\n<\/ul>\n\n\n\n<p><strong>\ud83d\udca1Suggested fix:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Move vias outside the pad area whenever possible.<\/li>\n\n\n\n<li>If via-in-pad is required, use resin plugging, plated filling, or another reliable via filling process.<\/li>\n\n\n\n<li>For standard PCB processes, open vias should not be placed directly on small pads.<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-4 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<h2 class=\"wp-block-heading\"><\/h2>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">3\ufe0f\u20e3What happens if all vias have solder mask openings?<\/h2>\n\n\n\n<p>\ud83d\udd0d<strong>Common symptom:<\/strong> All vias are exposed, especially vias close to pads.<\/p>\n\n\n\n<p>\u203c\ufe0f<strong>Possible impact:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Solder may flow into the vias, reducing solder volume on the pads.<\/li>\n\n\n\n<li>Exposed copper may increase the risk of solder bridging, solder balls, or shorts.<\/li>\n\n\n\n<li>Appearance and long-term reliability may be affected.<\/li>\n<\/ul>\n\n\n\n<p><strong>\ud83d\udca1Suggested fix:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Close solder mask openings for vias that do not need to be tested or soldered.<\/li>\n\n\n\n<li>Vias near pads should be tented or moved farther away.<\/li>\n\n\n\n<li>Test-point vias can remain exposed individually; avoid exposing all vias globally.<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-5 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<h2 class=\"wp-block-heading\"><\/h2>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">4\ufe0f\u20e3What happens if vias are too close to pads?<\/h2>\n\n\n\n<p>\ud83d\udd0d<strong>Common symptom:<\/strong> Vias are very close to SMT pad edges, or the solder mask dam is insufficient.<\/p>\n\n\n\n<p>\u203c\ufe0f<strong>Possible impact:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Solder may be pulled away into the via.<\/li>\n\n\n\n<li>If the solder mask dam breaks, the via and pad may bridge.<\/li>\n\n\n\n<li>Batch soldering consistency becomes poor.<\/li>\n<\/ul>\n\n\n\n<p><strong>\ud83d\udca1Suggested fix:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Increase the distance between vias and pads, and ensure sufficient solder mask dam width.<\/li>\n\n\n\n<li>For high-density designs, confirm the minimum solder mask dam capability with the PCB manufacturer.<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-6 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<h2 class=\"wp-block-heading\"><\/h2>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">5\ufe0f\u20e3What happens if a USB connector is too far from the board edge?<\/h2>\n\n\n\n<p>\ud83d\udd0d<strong>Common symptom:<\/strong> The USB connector opening is not close enough to the PCB edge, or the connector front is blocked by the board edge or enclosure.<\/p>\n\n\n\n<p>\u203c\ufe0f<strong>Possible impact:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The USB plug may not fully insert.<\/li>\n\n\n\n<li>Poor contact or abnormal mechanical stress may occur during use.<\/li>\n<\/ul>\n\n\n\n<p><strong>\ud83d\udca1Suggested fix:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Place the USB connector according to the board-edge dimensions recommended in the datasheet.<\/li>\n\n\n\n<li>Use a 3D model to check the connector, enclosure, panel opening, and PCB edge relationship.<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<h2 class=\"wp-block-heading\"><\/h2>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">6\ufe0f\u20e3What happens if a component needs to overhang the board edge but the layout does not reserve space?<\/h2>\n\n\n\n<p>\ud83d\udd0d<strong>Common symptom:<\/strong> Part of a USB connector, Type-C connector, card socket, button, antenna connector, or similar component should extend beyond the PCB edge, but the PCB outline does not allow it.<\/p>\n\n\n\n<p>\u203c\ufe0f<strong>Possible impact:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The component cannot sit flat, creating soldering stress.<\/li>\n\n\n\n<li>External plugs, cards, or buttons may not work properly.<\/li>\n\n\n\n<li>Mechanical assembly may fail, and the PCB may need to be redesigned.<\/li>\n<\/ul>\n\n\n\n<p><strong>\ud83d\udca1Suggested fix:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Follow the datasheet recommended edge-mount or board-cutout layout.<\/li>\n\n\n\n<li>Perform a 3D assembly check before production.<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<h2 class=\"wp-block-heading\"><\/h2>\n<\/div>\n<\/div>\n\n\n\n<p>Small layout details can have a big impact on PCB manufacturing and assembly. Checking hole sizes, via placement, solder mask openings, and board-edge spacing before production can help reduce rework, delays, and reliability risks.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">\ud83d\udc47Preparing your next PCB or PCBA build? <\/mark><\/strong><\/h2>\n\n\n\n<p><strong><a href=\"https:\/\/www.seeedstudio.com\/fusion.html?from=blog\">Seeed Fusion<\/a><\/strong> provides<mark style=\"background-color:#fcb900\" class=\"has-inline-color\"> <strong>free DFA\/DFM review<\/strong> <\/mark>to help identify potential issues before manufacturing. From PCB fabrication and PCBA assembly to component sourcing, testing, and small-batch production, we help you move from design files to a reliable build with more confidence.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>Take a look at Seeed Fusion&#8217;s PCB\/PCBA service and get free DFA\/DFM support before production.<\/strong><\/p>\n\n\n\n<p>\ud83d\ude80<a href=\"https:\/\/www.seeedstudio.com\/fusion_pcb.html?from=blog\"><strong>Get Started \u2192<\/strong><\/a><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<h2 class=\"wp-block-heading\"><\/h2>\n<\/div>\n<\/div>\n\n\n\n<p><strong>If you have any other questions, feel free to contact us at<a href=\"mailto:\">\u00a0fusion@seeed.io<\/a><\/strong><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Small PCB layout details can cause big problems during fabrication and assembly. Incorrect hole sizes,<\/p>\n","protected":false},"author":3684,"featured_media":129992,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"no","_lmt_disable":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"iawp_total_views":0,"footnotes":""},"categories":[1,4705],"tags":[5476,3968,5466],"class_list":["post-129991","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-seeed-studio-fusion","tag-faq","tag-pcba-knowledge","tag-pcba-tutorials"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>PCB Manufacturing FAQ: Hole Size, Via Placement, Solder Mask, and Board Edge Design - Latest News from Seeed Studio<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.seeedstudio.com\/blog\/2026\/07\/07\/fusion-pcb-manufacturing-faq-hole-size-via-placement-solder-mask-and-board-edge-design\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PCB Manufacturing FAQ: Hole Size, Via Placement, Solder Mask, and Board Edge Design - Latest News from Seeed Studio\" \/>\n<meta property=\"og:description\" content=\"Small PCB layout details can cause big problems during fabrication and assembly. Incorrect hole sizes,\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.seeedstudio.com\/blog\/2026\/07\/07\/fusion-pcb-manufacturing-faq-hole-size-via-placement-solder-mask-and-board-edge-design\/\" \/>\n<meta property=\"og:site_name\" content=\"Latest News from Seeed Studio\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-07T11:06:58+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-07T11:07:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/07\/image.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1672\" \/>\n\t<meta property=\"og:image:height\" content=\"941\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Ginny Zhang\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ginny Zhang\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.seeedstudio.com\/blog\/2026\/07\/07\/fusion-pcb-manufacturing-faq-hole-size-via-placement-solder-mask-and-board-edge-design\/\",\"url\":\"https:\/\/www.seeedstudio.com\/blog\/2026\/07\/07\/fusion-pcb-manufacturing-faq-hole-size-via-placement-solder-mask-and-board-edge-design\/\",\"name\":\"PCB Manufacturing FAQ: Hole Size, Via Placement, Solder Mask, and Board Edge Design - 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