{"id":331,"date":"2011-10-07T07:44:14","date_gmt":"2011-10-07T07:44:14","guid":{"rendered":"https:\/\/blog.wika.com\/en\/?p=331"},"modified":"2022-11-29T08:01:24","modified_gmt":"2022-11-29T07:01:24","slug":"pnp-npn-transistor-outputs","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/en\/general\/pnp-npn-transistor-outputs\/","title":{"rendered":"Connection diagram of PNP and NPN transistor outputs for electronic pressure switches"},"content":{"rendered":"<p><strong>Manufacturers of electronic pressure switches often offer both PNP and NPN switching outputs. Here is a brief explanation how the two different outputs should be connected. <\/strong><\/p>\n<p>In principle, both are bipolar transistors in which only the internal arrangement of the pn transitions differs. This is why the load must be connected differently to the transistor outputs.<\/p>\n<h2>PNP switching output<\/h2>\n<p>The load is connected to the switching output with GND as the reference point. When a change in signal takes place by reaching a pressure value, the supply voltage (U+) is &#8220;switched through&#8221;, allowing current to flow from U+ through the transistor and through the load to GND.<\/p>\n<h2>NPN switching output<\/h2>\n<p>The load is connected to the switching output with U+ as the reference point. When a change in signal takes place by reaching a pressure value, the supply voltage (U+) is &#8220;switched on&#8221;, allowing current to flow from U+ through the load via the transistor and to GND.<\/p>\n<h2>Fields of application<\/h2>\n<p>In my experience, PNP switching outputs are used mainly in Europe, and NPN outputs almost exclusively in Asia. In contrast, in North America, the country where the transistor was invented, relay outputs with potential-free contacts for AC 110 V loads are most widely used.<\/p>\n<p><strong>Note<br \/>\n<\/strong>The WIKA pressure switch <a href=\"https:\/\/en-co.wika.de\/psd_30_psd_31_en_co.WIKA\" rel=\"external\" target=\"_blank\">PSD-30<\/a> is available either with PNP or NPN switching output.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Manufacturers of electronic pressure switches often offer both PNP and NPN switching outputs. Here is a brief explanation how the two different outputs should be connected. In principle, both are bipolar transistors in which only the internal arrangement of the pn transitions differs. This is why the load must be connected differently to the transistor [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":6391,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[79,102],"class_list":["post-331","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","tag-pressure-switch","tag-switching-output"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PNP and NPN transistor outputs for electronic pressure switches<\/title>\n<meta name=\"description\" content=\"Manufacturers of electronic pressure switches often offer both PNP and NPN switching outputs. This article explains how the two outputs should be connected.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.wika.com\/en\/general\/pnp-npn-transistor-outputs\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PNP and NPN transistor outputs for electronic pressure switches\" \/>\n<meta property=\"og:description\" content=\"Manufacturers of electronic pressure switches often offer both PNP and NPN switching outputs. This article explains how the two outputs should be connected.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.wika.com\/en\/general\/pnp-npn-transistor-outputs\/\" \/>\n<meta property=\"og:site_name\" content=\"WIKA blog\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.wika.com\/en\/files\/2011\/10\/PNP_NPN_switching-outputs.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"838\" \/>\n\t<meta property=\"og:image:height\" content=\"471\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"J\u00fcrgen Reiser\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"J\u00fcrgen Reiser\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/blog.wika.com\/en\/general\/pnp-npn-transistor-outputs\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/blog.wika.com\/en\/general\/pnp-npn-transistor-outputs\/\"},\"author\":{\"name\":\"J\u00fcrgen Reiser\",\"@id\":\"https:\/\/blog.wika.com\/en\/#\/schema\/person\/dcaa9466676a1114b9c41f4b185eb626\"},\"headline\":\"Connection diagram of PNP and NPN transistor outputs for electronic pressure switches\",\"datePublished\":\"2011-10-07T07:44:14+00:00\",\"dateModified\":\"2022-11-29T07:01:24+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/blog.wika.com\/en\/general\/pnp-npn-transistor-outputs\/\"},\"wordCount\":231,\"image\":{\"@id\":\"https:\/\/blog.wika.com\/en\/general\/pnp-npn-transistor-outputs\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blog.wika.com\/en\/files\/2011\/10\/PNP_NPN_switching-outputs.jpg\",\"keywords\":[\"Pressure switch\",\"Switching output\"],\"articleSection\":[\"General\"],\"inLanguage\":\"en-GB\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blog.wika.com\/en\/general\/pnp-npn-transistor-outputs\/\",\"url\":\"https:\/\/blog.wika.com\/en\/general\/pnp-npn-transistor-outputs\/\",\"name\":\"PNP and NPN transistor outputs for electronic pressure switches\",\"isPartOf\":{\"@id\":\"https:\/\/blog.wika.com\/en\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blog.wika.com\/en\/general\/pnp-npn-transistor-outputs\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blog.wika.com\/en\/general\/pnp-npn-transistor-outputs\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blog.wika.com\/en\/files\/2011\/10\/PNP_NPN_switching-outputs.jpg\",\"datePublished\":\"2011-10-07T07:44:14+00:00\",\"dateModified\":\"2022-11-29T07:01:24+00:00\",\"author\":{\"@id\":\"https:\/\/blog.wika.com\/en\/#\/schema\/person\/dcaa9466676a1114b9c41f4b185eb626\"},\"description\":\"Manufacturers of electronic pressure switches often offer both PNP and NPN switching outputs. 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