{"id":774,"date":"2011-10-07T14:45:48","date_gmt":"2011-10-07T14:45:48","guid":{"rendered":"https:\/\/ibex.tech\/resources\/?p=774"},"modified":"2022-02-18T15:05:17","modified_gmt":"2022-02-18T15:05:17","slug":"reverse-polarity-protection","status":"publish","type":"post","link":"https:\/\/ibex.tech\/resources\/geek-area\/electronics\/power-supply\/reverse-polarity-protection","title":{"rendered":"Reverse Polarity Protection"},"content":{"rendered":"<p>\nThis trick using a P channel mosfet is a common way to provide reverse polarity protection on a power supply input.&nbsp; It avoids the voltage drop problem of using a diode, with just the resistance of the mosfet to consider.\n<\/p>\n<p>\n<a href=\"https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/reverse_polarity_protect.png\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" class=\"alignnone size-full wp-image-775\" height=\"324\" src=\"https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/reverse_polarity_protect.png\" title=\"reverse_polarity_protect\" width=\"567\" srcset=\"https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/reverse_polarity_protect.png 567w, https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/reverse_polarity_protect-300x171.png 300w\" sizes=\"auto, (max-width: 567px) 100vw, 567px\" \/><\/a>\n<\/p>\n<p>\n<strong><em>Important &#8211; ensure you don&#39;t violate the mosfet max&nbsp;Vgs and Vds specification!<\/em><\/strong>\n<\/p>\n<p>\nHere&#39;s an example for a 24V power input:\n<\/p>\n<p>\n<a href=\"https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/reverse_polarity_protect_24v.png\"><img loading=\"lazy\" decoding=\"async\" alt=\"reverse_polarity_protect_24v\" class=\"alignnone size-full wp-image-1789\" height=\"319\" src=\"https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/reverse_polarity_protect_24v.png\" width=\"586\" srcset=\"https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/reverse_polarity_protect_24v.png 586w, https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/reverse_polarity_protect_24v-300x163.png 300w, https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/reverse_polarity_protect_24v-60x33.png 60w, https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/reverse_polarity_protect_24v-150x82.png 150w\" sizes=\"auto, (max-width: 586px) 100vw, 586px\" \/><\/a>\n<\/p>\n<p>\n&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This trick using a P channel mosfet is a common way to provide reverse polarity protection on a power supply input.&nbsp; It avoids the voltage drop problem of using a diode, with just the resistance of the mosfet to consider. Important &#8211; ensure you don&#39;t violate the mosfet max&nbsp;Vgs and Vds specification! Here&#39;s an example [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47],"tags":[],"class_list":["post-774","post","type-post","status-publish","format-standard","hentry","category-power-supply"],"_links":{"self":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts\/774","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/comments?post=774"}],"version-history":[{"count":3,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts\/774\/revisions"}],"predecessor-version":[{"id":1790,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts\/774\/revisions\/1790"}],"wp:attachment":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/media?parent=774"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/categories?post=774"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/tags?post=774"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}