{"id":1621,"date":"2021-09-14T08:02:00","date_gmt":"2021-09-14T08:02:00","guid":{"rendered":"https:\/\/www.axcontrol.com\/blog\/?p=1621"},"modified":"2021-09-14T18:39:37","modified_gmt":"2021-09-14T18:39:37","slug":"surface-mount-technology-what-is-smt","status":"publish","type":"post","link":"https:\/\/www.axcontrol.com\/blog\/2021\/surface-mount-technology-what-is-smt\/14\/09\/","title":{"rendered":"Surface Mount Technology: What is SMT?"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img data-attachment-id=\"1622\" data-permalink=\"https:\/\/www.axcontrol.com\/blog\/2021\/surface-mount-technology-what-is-smt\/14\/09\/smt-components\/\" data-orig-file=\"https:\/\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/09\/SMT-components.jpg\" data-orig-size=\"1024,768\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"SMT-components\" data-image-description=\"&lt;p&gt;SMT components containing multiple rows of components.&lt;\/p&gt;\n\" data-image-caption=\"\" data-medium-file=\"https:\/\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/09\/SMT-components-300x225.jpg\" data-large-file=\"https:\/\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/09\/SMT-components.jpg\" decoding=\"async\" loading=\"lazy\" width=\"1024\" height=\"768\" src=\"https:\/\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/09\/SMT-components.jpg\" alt=\"Surface mount technology components on a narrow circuit board. \" class=\"wp-image-1622\" srcset=\"https:\/\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/09\/SMT-components.jpg 1024w, https:\/\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/09\/SMT-components-300x225.jpg 300w, https:\/\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/09\/SMT-components-768x576.jpg 768w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><figcaption>Surface Mount Technology components in place.  By JCHaywire. CC BY-SA 2.0 <\/figcaption><\/figure>\n\n\n\n<p>Surface mount technology has changed how printed circuit boards are designed.  But what do you know about it? <\/p>\n\n\n\n<p>The 1970s and 80s saw a sharp rise in the need for PCBs (printed circuit boards.) To meet that demand, designers had to find a way to manufacture boards more efficiently.  <\/p>\n\n\n\n<p> But the traditional way of mounting components&#8211;using pre-formed lead wires connected to the board through plated through holes&#8211;didn&#8217;t allow for fast assembly.   Components had to line up at the correct angle before they could mount to the surface, slowing down assembly. <\/p>\n\n\n\n<!--more-->\n\n\n\n<p>Enter surface mount technology.  Originally called planar mounting, SMT was originally introduced in the 1960s, but didn&#8217;t become popular until the late 1980s.  A decade later, most commercially developed PCBs used surface-mounted devices.  <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-attachment-id=\"1624\" data-permalink=\"https:\/\/www.axcontrol.com\/blog\/2021\/surface-mount-technology-what-is-smt\/14\/09\/is200sturh4a\/\" data-orig-file=\"https:\/\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/09\/IS200STURH4A.jpg\" data-orig-size=\"1200,900\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"IS200STURH4A\" data-image-description=\"&lt;p&gt;IS200 board used in Mark VI turbine controls. Sold By AX Control Inc&lt;\/p&gt;\n\" data-image-caption=\"\" data-medium-file=\"https:\/\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/09\/IS200STURH4A-300x225.jpg\" data-large-file=\"https:\/\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/09\/IS200STURH4A-1024x768.jpg\" decoding=\"async\" loading=\"lazy\" width=\"1024\" height=\"768\" src=\"https:\/\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/09\/IS200STURH4A-1024x768.jpg\" alt=\"General Electric Simplex Turbine Protection Input PCB with SMT components. \" class=\"wp-image-1624\" srcset=\"https:\/\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/09\/IS200STURH4A-1024x768.jpg 1024w, https:\/\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/09\/IS200STURH4A-300x225.jpg 300w, https:\/\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/09\/IS200STURH4A-768x576.jpg 768w, https:\/\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/09\/IS200STURH4A.jpg 1200w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><figcaption>The <a href=\"https:\/\/www.axcontrol.com\/automation\/ge-boards\/mark-vi-is200\/IS200STURH4A\">GE IS200STURH4A Simplex Turbine Protection Card<\/a> has many SMT-mounted components.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Are the Advantages of SMT? <\/h2>\n\n\n\n<p>Surface mount technology has several advantages over previously used through-hole (TH) technology.  These include<\/p>\n\n\n\n<ul><li>easier assembly automation and repair<\/li><li>improved electrical performance<\/li><li>increased circuit density<\/li><li>reduced manufacturing and handling costs<\/li><li>higher overall product quality <\/li><\/ul>\n\n\n\n<p>SMT components take up less room than similar TH components.  Also, unlike through-hole components, SMTs can mount to both sides of a printed circuit board.  <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are the disadvantages of Surface Mount Technology? <\/h2>\n\n\n\n<p> However, surface mount technology has some drawbacks.   Drawbacks are often related to the solder compound that connects components to the board and includes<\/p>\n\n\n\n<ul><li>damaged connections caused by thermal cycling <\/li><li>ultra-fine solder joint dimensions may have voiding that leads to joint failure<\/li><\/ul>\n\n\n\n<p>Other issues include cryptic ID codes due to lack of space on SMT components for identification marks, incompatibility with plug-in breadboards, and some incompatibility with sockets. <\/p>\n\n\n\n<p>Also, surface mount boards may need additional support to protect from strain or flexing.  Through-hole components naturally offer some flexibility; not so with those soldered directly to the board surface.   Too much stress or warping and solder can crack.   A good design can minimize this simply by mounting components at a right angle to the longest board dimension (the most likely to flex.) <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SMT vs SMD: The Difference<\/h2>\n\n\n\n<p>As we&#8217;ve covered, Surface Mount Technology (SMT) is the method allowing electrical components to mount directly to the surface of a printed circuit board.  So then,  what is SMD? <\/p>\n\n\n\n<p>A SMD, or Surface Mounted Device, is a component designed using surface mount technology (SMT) so it can mount directly to the board&#8217;s surface. <\/p>\n\n\n\n<p><strong>SMT equals <em>technique<\/em>.  SMD equals <em>doohickey<\/em>.   You&#8217;ll never forget it again. <\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Does Surface Mount Technology Work? <\/h2>\n\n\n\n<p>SMT is a semi-automated process.   Components are placed on top of a circuit panel and attached to copper pads, or traces, using solder.  <\/p>\n\n\n\n<p>Modern manufacturers often use pick and place machines to orient, locate, and place components.  Solder paste is stenciled onto the board using a stencil printer before components are mounted.  Using this method, manufacturers can mount tens of thousands of components each hour. <\/p>\n\n\n\n<p>The boards have to be &#8220;cooked&#8221; in an oven in a final step to ensure the solder has made full contact between component and board. <\/p>\n\n\n\n<p class=\"has-text-align-center\">Find out more about PCB components in our <a href=\"https:\/\/www.axcontrol.com\/blog\/2021\/how-to-identify-components-on-printed-circuit-boards\/06\/07\/\">authoritative circuit board components blog post<\/a>. <\/p>\n\n\n\n<p class=\"has-text-align-center\">Need help sourcing <a href=\"https:\/\/www.axcontrol.com\/\">replacement parts for GE, Reliance, or Woodward equipment<\/a>?  Our team can help with that! <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Surface mount technology has changed how printed circuit boards are designed. But what do you know about it? The 1970s and 80s saw a sharp rise in the need for PCBs (printed circuit boards.) To meet that demand, designers had to find a way to manufacture boards more efficiently. But the traditional way of mounting &hellip; <a href=\"https:\/\/www.axcontrol.com\/blog\/2021\/surface-mount-technology-what-is-smt\/14\/09\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Surface Mount Technology: What is SMT?&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false},"categories":[11],"tags":[360,361],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Surface Mount Technology: What is SMT? - AX Control, Inc.<\/title>\n<meta name=\"description\" content=\"Surface Mount Technology (SMT) changed how PCBs are manufactured and designed. But what do you know about it? Find out more in our short blog post.\" \/>\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.axcontrol.com\/blog\/2021\/surface-mount-technology-what-is-smt\/14\/09\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Surface Mount Technology: What is SMT? - AX Control, Inc.\" \/>\n<meta property=\"og:description\" content=\"Surface Mount Technology (SMT) changed how PCBs are manufactured and designed. But what do you know about it? 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AX Control sells many legacy systems, including several of the Speedtronic series like the Mark I-II, Mark IV, the Mark V, as\u2026","rel":"","context":"In &quot;Circuit Boards&quot;","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":504,"url":"https:\/\/www.axcontrol.com\/blog\/2020\/what-is-a-printed-circuit-board\/12\/02\/","url_meta":{"origin":1621,"position":1},"title":"Printed Circuit Board Basics","date":"February 12, 2020","format":false,"excerpt":"Learn about PCBs, how they work, and how to read them.","rel":"","context":"In &quot;Circuit Boards&quot;","img":{"alt_text":"printed-circuit-board-4083582_1280","src":"https:\/\/i0.wp.com\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/04\/printed-circuit-board-4083582_1280.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":1477,"url":"https:\/\/www.axcontrol.com\/blog\/2021\/how-to-identify-components-on-printed-circuit-boards\/06\/07\/","url_meta":{"origin":1621,"position":2},"title":"How To Identify Components on Printed Circuit Boards","date":"July 6, 2021","format":false,"excerpt":"It can be hard to identify all the components on printed circuit boards (PCBs). 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If you've worked with printed circuit boards (PCBs) at all, you've noticed the\u2026","rel":"","context":"In &quot;Circuit Boards&quot;","img":{"alt_text":"IS200KTURH1AAA_1","src":"https:\/\/i0.wp.com\/www.axcontrol.com\/blog\/wp-content\/uploads\/2021\/08\/IS200KTURH1AAA_1-scaled.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":769,"url":"https:\/\/www.axcontrol.com\/blog\/2020\/your-guitar-is-like-a-nuclear-power-plant\/28\/05\/","url_meta":{"origin":1621,"position":4},"title":"How Your Guitar is Like a Nuclear Power Plant","date":"May 28, 2020","format":false,"excerpt":"The two things have more in common than meltdowns.","rel":"","context":"In &quot;Education&quot;","img":{"alt_text":"Guitar","src":"https:\/\/i0.wp.com\/www.axcontrol.com\/blog\/wp-content\/uploads\/2020\/05\/guitar-2816248_640.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":410,"url":"https:\/\/www.axcontrol.com\/blog\/2020\/a-history-of-ge-speedtronic-turbine-control\/27\/01\/","url_meta":{"origin":1621,"position":5},"title":"A History of GE Speedtronic Turbine Control","date":"January 27, 2020","format":false,"excerpt":"GE has a long history of providing industrial control systems for gas and steam turbines.","rel":"","context":"In &quot;Education&quot;","img":{"alt_text":"GE H Series Gas Turbine","src":"https:\/\/i0.wp.com\/www.axcontrol.com\/blog\/wp-content\/uploads\/2020\/01\/GE_H_series_Gas_Turbine.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.axcontrol.com\/blog\/wp-json\/wp\/v2\/posts\/1621"}],"collection":[{"href":"https:\/\/www.axcontrol.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.axcontrol.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.axcontrol.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.axcontrol.com\/blog\/wp-json\/wp\/v2\/comments?post=1621"}],"version-history":[{"count":3,"href":"https:\/\/www.axcontrol.com\/blog\/wp-json\/wp\/v2\/posts\/1621\/revisions"}],"predecessor-version":[{"id":1655,"href":"https:\/\/www.axcontrol.com\/blog\/wp-json\/wp\/v2\/posts\/1621\/revisions\/1655"}],"wp:attachment":[{"href":"https:\/\/www.axcontrol.com\/blog\/wp-json\/wp\/v2\/media?parent=1621"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.axcontrol.com\/blog\/wp-json\/wp\/v2\/categories?post=1621"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.axcontrol.com\/blog\/wp-json\/wp\/v2\/tags?post=1621"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}