{"id":3877,"date":"2015-03-19T06:58:18","date_gmt":"2015-03-19T13:58:18","guid":{"rendered":"https:\/\/blogs.mentor.com\/jimmartens\/?p=3877"},"modified":"2026-03-27T09:23:46","modified_gmt":"2026-03-27T13:23:46","slug":"qfns-cad-library-series-part-4","status":"publish","type":"post","link":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/2015\/03\/19\/qfns-cad-library-series-part-4\/","title":{"rendered":"QFNs  &#8211; CAD Library Series: Part 4"},"content":{"rendered":"<p>In the 4th of this 4 part whitepaper series dedicated to CAD library quality, we&#8217;ll describe each aspect to consider when <a href=\"http:\/\/www.pads.com\/resources\/overview\/pcb-design-perfection-the-cad-library-series-part-4-qfn-quad-flat-no-lead-components-cf23ddb0-c941-446f-b6db-73539e991322?cmpid=9049\" target=\"_blank\" rel=\"noopener noreferrer\">creating QFN (Quad Flat No-Lead) component<\/a> library parts. It also describes the impact each feature has in the PCB process.<img loading=\"lazy\" decoding=\"async\" class=\" size-full wp-image-3880 alignright\" src=\"https:\/\/blogs.sw.siemens.com\/wp-content\/uploads\/sites\/55\/2015\/03\/blog-image-1.png\" alt=\"blog image 1\" width=\"256\" height=\"206\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>The QFN component family includes the <strong>QFN and PQFNs<\/strong> with pullback leads. This paper discusses everything from the land sizes for both lead types to the placement courtyard and routing schemes to consider for different technology and density levels.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft  wp-image-3882\" src=\"https:\/\/blogs.sw.siemens.com\/wp-content\/uploads\/sites\/55\/2015\/03\/blog-image-2-520x669.png\" alt=\"blog image 2\" width=\"325\" height=\"418\" \/><strong><a href=\"http:\/\/www.pads.com\/resources\/overview\/pcb-design-perfection-the-cad-library-series-part-4-qfn-quad-flat-no-lead-components-cf23ddb0-c941-446f-b6db-73539e991322?cmpid=9049\" target=\"_blank\" rel=\"noopener noreferrer\">Click here<\/a> to access this QFN Whitepaper now.<\/strong><\/p>\n<p>Download <strong>Part 1<\/strong> of this white paper series dedicated to the creation of <strong>Molded Body components<\/strong> by <a href=\"http:\/\/www.pads.com\/resources\/overview\/pcb-design-perfection-the-cad-library-series-part-1-molded-body-components-8606fa51-b629-4eda-8151-3b9ccb99ba7d?cmpid=9049\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>Clicking here <\/strong><\/a><\/p>\n<p><strong><a href=\"http:\/\/www.pads.com\/resources\/overview\/pcb-design-perfection-the-cad-library-series-part-2-sot-small-outline-transistors--8120a935-a7a1-4895-9b0b-cc04f4e98b2b?cmpid=9049\" target=\"_blank\" rel=\"noopener noreferrer\">Click here<\/a><\/strong> to download <strong>Part 2<\/strong> that covers the\u00a0 <strong>Small Outline Transistor (SOT)<\/strong>\u00a0 components.<\/p>\n<p><strong><a href=\"http:\/\/www.pads.com\/resources\/overview\/pcb-design-perfection-the-cad-library-series-part-3-bga-ball-grid-arrays--ff1decfb-2963-4024-8f58-8be0ac2b3e1b?cmpid=-9049\" target=\"_blank\" rel=\"noopener noreferrer\">Click here<\/a><\/strong> to download <strong>Part 3<\/strong> covering <strong>BGAs.<\/strong><\/p>\n<p>To learn more about the <strong>xDM Land Pattern Creator <\/strong><a href=\"http:\/\/www.pads.com\/library-management\/land-pattern-generation\/?cmpid=9049\" target=\"_blank\" rel=\"noopener noreferrer\">Click here. <\/a>And to learn more about <strong>Library Management<\/strong>, <a href=\"http:\/\/www.pads.com\/library-management\/?cmpid=9049\" target=\"_blank\" rel=\"noopener noreferrer\">Click here<\/a>!<\/p>\n<p>Thanks for reading!<\/p>\n<p>John<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the 4th of this 4 part whitepaper series dedicated to CAD library quality, we&#8217;ll describe each aspect to consider&#8230;<\/p>\n","protected":false},"author":32176,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spanish_translation":"","french_translation":"","german_translation":"","italian_translation":"","polish_translation":"","japanese_translation":"","chinese_translation":"","footnotes":""},"categories":[13],"tags":[],"industry":[],"product":[],"coauthors":[],"class_list":["post-3877","post","type-post","status-publish","format-standard","hentry","category-news"],"_links":{"self":[{"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/posts\/3877","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/users\/32176"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/comments?post=3877"}],"version-history":[{"count":1,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/posts\/3877\/revisions"}],"predecessor-version":[{"id":10469,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/posts\/3877\/revisions\/10469"}],"wp:attachment":[{"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/media?parent=3877"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/categories?post=3877"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/tags?post=3877"},{"taxonomy":"industry","embeddable":true,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/industry?post=3877"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/product?post=3877"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/coauthors?post=3877"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}