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You probably don’t know it, but you've been referring to most D-sub connectors incorrectly for your entire career." /> <link rel="canonical" href="https://www.connectortips.com/d-sub-connectors-everyone-speaks-of-them-incorrectly/" /> <meta name="twitter:card" content="summary_large_image" /> <meta name="twitter:title" content="D-sub connectors: Everyone speaks of them incorrectly" /> <meta name="twitter:description" content="You probably don’t know it, but you've been referring to most D-sub connectors incorrectly for your entire career. You probably don’t know it, but you've been referring to most D-sub connectors incorrectly for your entire career." /> <meta name="twitter:image" content="https://www.connectortips.com/wp-content/uploads/2022/05/DA-sub-29_on_board_2000x1500.jpg" /> <meta name="twitter:creator" content="@ConnectorTips" /> <meta name="twitter:site" content="@ConnectorTips" /> <meta name="twitter:label1" content="Written by" /> <meta name="twitter:data1" content="Martin Rowe" /> <meta name="twitter:label2" content="Est. reading time" /> <meta name="twitter:data2" content="6 minutes" /> <script type="application/ld+json" class="yoast-schema-graph">{"@context":"https://schema.org","@graph":[{"@type":"WebPage","@id":"https://www.connectortips.com/d-sub-connectors-everyone-speaks-of-them-incorrectly/","url":"https://www.connectortips.com/d-sub-connectors-everyone-speaks-of-them-incorrectly/","name":"D-sub connectors: Everyone speaks of them incorrectly","isPartOf":{"@id":"https://www.connectortips.com/#website"},"primaryImageOfPage":{"@id":"https://www.connectortips.com/d-sub-connectors-everyone-speaks-of-them-incorrectly/#primaryimage"},"image":{"@id":"https://www.connectortips.com/d-sub-connectors-everyone-speaks-of-them-incorrectly/#primaryimage"},"thumbnailUrl":"https://www.connectortips.com/wp-content/uploads/2022/05/DA-sub-29_on_board_2000x1500.jpg","datePublished":"2022-05-16T04:09:26+00:00","dateModified":"2022-05-16T23:21:37+00:00","author":{"@id":"https://www.connectortips.com/#/schema/person/993478af54de93b5c7017ad4b5da6c9e"},"description":"You probably don’t know it, but you've been referring to most D-sub connectors incorrectly for your entire career. 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This DA-29 board-mounted connector uses the \"A\" size shell with 29 pins."},{"@type":"BreadcrumbList","@id":"https://www.connectortips.com/d-sub-connectors-everyone-speaks-of-them-incorrectly/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://www.connectortips.com/"},{"@type":"ListItem","position":2,"name":"D-sub connectors: Everyone speaks of them incorrectly"}]},{"@type":"WebSite","@id":"https://www.connectortips.com/#website","url":"https://www.connectortips.com/","name":"Connector Tips","description":"Connector Tips has connector and electrical connector news, product highlights and and editorial coverage.","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://www.connectortips.com/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https://www.connectortips.com/#/schema/person/993478af54de93b5c7017ad4b5da6c9e","name":"Martin Rowe","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https://www.connectortips.com/#/schema/person/image/","url":"https://secure.gravatar.com/avatar/7a472df154dd5bd988a80820815b99e7?s=96&d=mm&r=g","contentUrl":"https://secure.gravatar.com/avatar/7a472df154dd5bd988a80820815b99e7?s=96&d=mm&r=g","caption":"Martin Rowe"},"url":"https://www.connectortips.com/author/mrowe/"}]}</script>  <link rel='dns-prefetch' href='//static.addtoany.com' /> <link rel='dns-prefetch' href='//kit.fontawesome.com' /> <link rel='dns-prefetch' href='//fonts.googleapis.com' /> <link rel="alternate" type="application/rss+xml" title="Connector Tips » Feed" href="https://www.connectortips.com/feed/" /> <link rel="alternate" type="application/rss+xml" title="Connector Tips » Comments Feed" href="https://www.connectortips.com/comments/feed/" /> <link rel="alternate" type="application/rss+xml" title="Connector Tips » D-sub connectors: Everyone speaks of them incorrectly Comments Feed" href="https://www.connectortips.com/d-sub-connectors-everyone-speaks-of-them-incorrectly/feed/" /> <script type="text/javascript"> /* <![CDATA[ */ window._wpemojiSettings = {"baseUrl":"https:\/\/s.w.org\/images\/core\/emoji\/15.0.3\/72x72\/","ext":".png","svgUrl":"https:\/\/s.w.org\/images\/core\/emoji\/15.0.3\/svg\/","svgExt":".svg","source":{"concatemoji":"https:\/\/www.connectortips.com\/wp-includes\/js\/wp-emoji-release.min.js?ver=6.7.2"}}; /*! 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incorrectly"><header class="entry-header"><h1 class="entry-title">D-sub connectors: Everyone speaks of them incorrectly</h1> <p class="entry-meta"><time class="entry-time">May 16, 2022</time> By <span class="entry-author"><a href="https://www.connectortips.com/author/mrowe/" class="entry-author-link" rel="author"><span class="entry-author-name">Martin Rowe</span></a></span> <span class="entry-comments-link"><a href="https://www.connectortips.com/d-sub-connectors-everyone-speaks-of-them-incorrectly/#comments">1 Comment</a></span> </p></header><div class="entry-content"><div class="addtoany_share_save_container addtoany_content addtoany_content_top"><div class="a2a_kit a2a_kit_size_16 addtoany_list" data-a2a-url="https://www.connectortips.com/d-sub-connectors-everyone-speaks-of-them-incorrectly/" data-a2a-title="D-sub connectors: Everyone speaks of them incorrectly"><a class="a2a_button_facebook" href="https://www.addtoany.com/add_to/facebook?linkurl=https%3A%2F%2Fwww.connectortips.com%2Fd-sub-connectors-everyone-speaks-of-them-incorrectly%2F&linkname=D-sub%20connectors%3A%20Everyone%20speaks%20of%20them%20incorrectly" title="Facebook" rel="nofollow noopener" target="_blank"></a><a class="a2a_button_x" href="https://www.addtoany.com/add_to/x?linkurl=https%3A%2F%2Fwww.connectortips.com%2Fd-sub-connectors-everyone-speaks-of-them-incorrectly%2F&linkname=D-sub%20connectors%3A%20Everyone%20speaks%20of%20them%20incorrectly" title="X" rel="nofollow noopener" target="_blank"></a><a class="a2a_button_linkedin" href="https://www.addtoany.com/add_to/linkedin?linkurl=https%3A%2F%2Fwww.connectortips.com%2Fd-sub-connectors-everyone-speaks-of-them-incorrectly%2F&linkname=D-sub%20connectors%3A%20Everyone%20speaks%20of%20them%20incorrectly" title="LinkedIn" rel="nofollow noopener" target="_blank"></a><a class="a2a_dd addtoany_share_save addtoany_share" href="https://www.addtoany.com/share"></a></div></div><p><em>You probably don’t know it, but you’ve been referring to most D-sub connectors incorrectly for your entire career. Here’s how to get them right, but you’ll be speaking a language that few understand.</em></p> <p>D-Subminiature (D-sub) connectors, you find them in consumer PCs, industrial equipment, and even in networking equipment. They’re everywhere and manufactured by many companies. You’ve probably been referring to them incorrectly for years.</p> <figure id="attachment_6698" aria-describedby="caption-attachment-6698" style="width: 300px" class="wp-caption alignright"><a href="https://www.connectortips.com/wp-content/uploads/2022/04/DB-25_ribbon_cable.jpg"><img decoding="async" class="size-medium wp-image-6698" src="https://www.connectortips.com/wp-content/uploads/2022/04/DB-25_ribbon_cable-300x300.jpg" alt="DB-25 connectors" width="300" height="300" srcset="https://www.connectortips.com/wp-content/uploads/2022/04/DB-25_ribbon_cable-300x300.jpg 300w, https://www.connectortips.com/wp-content/uploads/2022/04/DB-25_ribbon_cable-1024x1024.jpg 1024w, https://www.connectortips.com/wp-content/uploads/2022/04/DB-25_ribbon_cable-150x150.jpg 150w, https://www.connectortips.com/wp-content/uploads/2022/04/DB-25_ribbon_cable-768x768.jpg 768w, https://www.connectortips.com/wp-content/uploads/2022/04/DB-25_ribbon_cable.jpg 1100w" sizes="(max-width: 300px) 100vw, 300px" /></a><figcaption id="caption-attachment-6698" class="wp-caption-text">Figure 1. Ribbon cables attache to DB-25 connector though use of a press.</figcaption></figure> <p>I once worked for a company that manufactured semiconductor process equipment. The <a href="http://www.chiphistory.org/landmarks/lm_GCA_wafertrack_1970/ip_GCA_wafertrack_1970.htm" target="_blank" rel="noopener">Wafertrac</a> moved wafers floating on air from one processing station to another. Each station connected to a dedicated controller board in a chassis through one or more 25-wire ribbon cables (Figure 1). The end of each cable used a DB-25 connector that inserted into the module or controller board. Once inside the module, wires from the ribbon cable then divided, going to other connectors that delivered power, control signals, and sense signals to and from a station.</p> <p>Instead of ribbon cables shown in Fig. 1, some of the I/O cables routed to the modules were shielded multi-wire cables. They carried, for example, power to a motor. As a result, we went to a DB connector such as the one shown in Figure 2, which has three high-current pins. Typically, the A3 line on the left delivers the power, with two return lines to minimize return-line impedance.</p> <figure id="attachment_6744" aria-describedby="caption-attachment-6744" style="width: 300px" class="wp-caption aligncenter"><a href="https://www.connectortips.com/wp-content/uploads/2022/05/D_connector_pinout_Phoenix.jpg"><img decoding="async" class="size-medium wp-image-6744" src="https://www.connectortips.com/wp-content/uploads/2022/05/D_connector_pinout_Phoenix-300x69.jpg" alt="DB-25 power" width="300" height="69" srcset="https://www.connectortips.com/wp-content/uploads/2022/05/D_connector_pinout_Phoenix-300x69.jpg 300w, https://www.connectortips.com/wp-content/uploads/2022/05/D_connector_pinout_Phoenix.jpg 417w" sizes="(max-width: 300px) 100vw, 300px" /></a><figcaption id="caption-attachment-6744" class="wp-caption-text">Figure 2. This DB-25 pin configuration uses fewer I/O pins but add three power pins.</figcaption></figure> <p>The connectors in Figs. 1 and 2 are “DB” connectors. Why? Because the shell outline looks something like a letter “D.” What about the next letter? Here’s where things do wrong.</p> <p>The second letter stands for the size of the connector shell. If that’s the case, then why do we often refer to all the D-sub connectors with “DB” as in DB-25, DB-9, and so on? We shouldn’t, but we do.</p> <figure id="attachment_6748" aria-describedby="caption-attachment-6748" style="width: 300px" class="wp-caption aligncenter"><a href="https://www.connectortips.com/wp-content/uploads/2022/05/d_subs_on_old_PC_1800x1483.jpg"><img loading="lazy" decoding="async" class="size-medium wp-image-6748" src="https://www.connectortips.com/wp-content/uploads/2022/05/d_subs_on_old_PC_1800x1483-300x247.jpg" alt="PC connectors" width="300" height="247" srcset="https://www.connectortips.com/wp-content/uploads/2022/05/d_subs_on_old_PC_1800x1483-300x247.jpg 300w, https://www.connectortips.com/wp-content/uploads/2022/05/d_subs_on_old_PC_1800x1483-1024x844.jpg 1024w, https://www.connectortips.com/wp-content/uploads/2022/05/d_subs_on_old_PC_1800x1483-768x633.jpg 768w, https://www.connectortips.com/wp-content/uploads/2022/05/d_subs_on_old_PC_1800x1483-1536x1265.jpg 1536w, https://www.connectortips.com/wp-content/uploads/2022/05/d_subs_on_old_PC_1800x1483.jpg 1800w" sizes="auto, (max-width: 300px) 100vw, 300px" /></a><figcaption id="caption-attachment-6748" class="wp-caption-text">Figure 3. Desktop computers used to have a DB-25 socket connector for printers, a DE-9 plug for a serial port, and a DE-15 socket for a VGA monitor.</figcaption></figure> <p>Look at the rear panel of an older desktop PC in Figure 3. Here, we have three D-subs with three pin configurations and two sizes. You might be tempted to refer to these connectors as DB-9, DB-15, and DB-25. Only the DB-25 is correct. The other two are DE-9 (used for a serial port) and DE-15 (for VGA video). There are five sizes in all, ranging in pins from 9 to 78. The table lays out the connector configuration for connectors that don’t use the large power pins. You can find many online pages that specify these connectors in detail. One such document is “<a href="https://www.peigenesis.com/images/content/flashcards/d-sub-cheatsheet.pdf" target="_blank" rel="noopener">D-Subminiture Talking Dog page</a>” from PEI-Genesis.</p> <table border="1" align="center"> <tbody> <tr style="background-color: #fcf3cf;"> <td style="padding: 5px;"><strong>Designation</strong></td> <td style="padding: 5px;"><strong>Number of pins (normal or high-density)</strong></td> <td style="padding: 5px;"><strong>Example configuration</strong></td> </tr> <tr> <td style="padding: 5px;">DA</td> <td style="padding: 5px;">15 or 26</td> <td style="padding: 5px;"><img decoding="async" src="https://www.connectortips.com/wp-content/uploads/2022/04/DA-15.jpg" /><br /> <img decoding="async" src="https://www.connectortips.com/wp-content/uploads/2022/04/DA-26.jpg" /></td> </tr> <tr> <td style="padding: 5px;">DB</td> <td style="padding: 5px;">25 or 44</td> <td style="padding: 5px;"><img decoding="async" src="https://www.connectortips.com/wp-content/uploads/2022/04/DB-25.jpg" /><br /> <img decoding="async" src="https://www.connectortips.com/wp-content/uploads/2022/04/DB-44.jpg" /></td> </tr> <tr> <td style="padding: 5px;">DC</td> <td style="padding: 5px;">37 or 62</td> <td style="padding: 5px;"><img decoding="async" src="https://www.connectortips.com/wp-content/uploads/2022/04/DC-37.jpg" /><br /> <img decoding="async" src="https://www.connectortips.com/wp-content/uploads/2022/04/DC-62.jpg" /></td> </tr> <tr> <td style="padding: 5px;">DD</td> <td style="padding: 5px;">50 or 78</td> <td style="padding: 5px;"><img decoding="async" src="https://www.connectortips.com/wp-content/uploads/2022/04/DD-50.jpg" /><br /> <img decoding="async" src="https://www.connectortips.com/wp-content/uploads/2022/04/DD-78.jpg" /></td> </tr> <tr> <td style="padding: 5px;">DE</td> <td style="padding: 5px;">9 or 15</td> <td style="padding: 5px;"><img decoding="async" src="https://www.connectortips.com/wp-content/uploads/2022/04/DE-15.jpg" /><br /> <img decoding="async" src="https://www.connectortips.com/wp-content/uploads/2022/04/DE-15.jpg" /></td> </tr> </tbody> </table> <figure id="attachment_6746" aria-describedby="caption-attachment-6746" style="width: 251px" class="wp-caption alignright"><a href="https://www.connectortips.com/wp-content/uploads/2022/05/D_connector_SolderCup_Conec.jpg"><img loading="lazy" decoding="async" class="size-full wp-image-6746" src="https://www.connectortips.com/wp-content/uploads/2022/05/D_connector_SolderCup_Conec.jpg" alt="" width="251" height="140" /></a><figcaption id="caption-attachment-6746" class="wp-caption-text">Figure 4. This DA-15 cable connector contains solder cups for attaching cable wires.</figcaption></figure> <p>D-sub connectors attach to cables and to boards. Figure 4 shows a 15-pin solder-cup version of a D-Sub connector while the ribbon cables in Fig. 1 connect by being pressed into the connector pins. Figure 5 shows a board that inserts into a PCIe slot to add eight RS-232/485 ports to a desktop computer. The board’s <a href="https://www.sealevel.com/product/7802ec-low-profile-pci-express-8-port-rs422-rs485-serial-interface/" target="_blank" rel="noopener">specification page</a> refers to the eight 9-pin cable connectors as “DB9.” Sorry, but it’s DE9. The “E” side connector, mostly used for 9-pin serial and 15-pin VGA, was developed last. Thus, it’s out of sequence relative to the others.</p> <figure id="attachment_6745" aria-describedby="caption-attachment-6745" style="width: 300px" class="wp-caption aligncenter"><a href="https://www.connectortips.com/wp-content/uploads/2022/05/7802ec-Hero-1000px.jpg" target="_blank" rel="noopener"><img loading="lazy" decoding="async" class="wp-image-6745 size-medium" src="https://www.connectortips.com/wp-content/uploads/2022/05/7802ec-Hero-1000px-300x300.jpg" alt="Sealevel systems serial port board" width="300" height="300" srcset="https://www.connectortips.com/wp-content/uploads/2022/05/7802ec-Hero-1000px-300x300.jpg 300w, https://www.connectortips.com/wp-content/uploads/2022/05/7802ec-Hero-1000px-150x150.jpg 150w, https://www.connectortips.com/wp-content/uploads/2022/05/7802ec-Hero-1000px-768x768.jpg 768w, https://www.connectortips.com/wp-content/uploads/2022/05/7802ec-Hero-1000px.jpg 1000w" sizes="auto, (max-width: 300px) 100vw, 300px" /></a><figcaption id="caption-attachment-6745" class="wp-caption-text">Figure 5. This serial-port board from Sealevel Systems adds eight ports to a desktop PC. The data sheet refers to the eight DE-9 cable connectors as DB9.</figcaption></figure> </div><footer class="entry-footer"><p class="entry-meta"><span class="entry-categories">Filed Under: <a href="https://www.connectortips.com/category/basics/" rel="category tag">Basics</a>, <a href="https://www.connectortips.com/category/products/board-to-board/" rel="category tag">board-to-board</a>, <a href="https://www.connectortips.com/category/products/cable-to-board/" rel="category tag">cable-to-board</a>, <a href="https://www.connectortips.com/category/products/d-sub/" rel="category tag">D-Sub</a>, <a href="https://www.connectortips.com/category/faq/" rel="category tag">FAQ</a>, <a href="https://www.connectortips.com/category/featured/" rel="category tag">Featured</a></span> <span class="entry-tags">Tagged With: <a href="https://www.connectortips.com/tag/sealevel-systems/" rel="tag">Sealevel Systems</a></span></p></footer></article><h2 class="screen-reader-text">Reader Interactions</h2><div class="entry-comments" id="comments"><h3>Comments</h3><ol class="comment-list"> <li class="comment byuser comment-author-mrowe bypostauthor even thread-even depth-1" id="comment-758298"> <article id="article-comment-758298"> <header class="comment-header"> <p class="comment-author"> <img alt='' src='https://secure.gravatar.com/avatar/7a472df154dd5bd988a80820815b99e7?s=48&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/7a472df154dd5bd988a80820815b99e7?s=96&d=mm&r=g 2x' class='avatar avatar-48 photo' height='48' width='48' loading='lazy' decoding='async'/><span class="comment-author-name">Martin Rowe</span> <span class="says">says</span> </p> <p class="comment-meta"><time class="comment-time"><a class="comment-time-link" href="https://www.connectortips.com/d-sub-connectors-everyone-speaks-of-them-incorrectly/#comment-758298">May 16, 2022 at 7:21 pm</a></time></p> </header> <div class="comment-content"> <p>Everyone gets thermocouple operation wrong too.</p> </div> <div 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