{"id":6419,"date":"2026-06-16T03:11:29","date_gmt":"2026-06-16T03:11:29","guid":{"rendered":"https:\/\/materialparts.com\/1n5819\/"},"modified":"2026-06-16T03:11:29","modified_gmt":"2026-06-16T03:11:29","slug":"1n5819","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/1n5819\/","title":{"rendered":"1N5819"},"content":{"rendered":"

\u0646\u0638\u0631\u0629 \u0639\u0627\u0645\u0629 \u0639\u0644\u0649 \u0627\u0644\u0645\u0646\u062a\u062c<\/h2>\n

The 1N5819 is a 40V, 1A Schottky barrier rectifier diode in a DO-41 (DO-204AL) axial leaded package. With a low forward voltage drop of 0.6V at 1A and fast switching capability, it is widely used as a catch diode in buck converters, reverse polarity protection, and power supply rectification.<\/p>\n

\u0627\u0644\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0631\u0626\u064a\u0633\u064a\u0629<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Peak Repetitive Reverse Voltage<\/td>\n40V<\/td>\n<\/tr>\n
Average Rectified Forward Current<\/td>\n1A<\/td>\n<\/tr>\n
Peak Forward Surge Current<\/td>\n25A (8.3ms)<\/td>\n<\/tr>\n
Forward Voltage<\/td>\n0.6V (max at IF=1A)<\/td>\n<\/tr>\n
Reverse Current<\/td>\n1mA (max at VR=40V)<\/td>\n<\/tr>\n
Reverse Recovery Time<\/td>\nns range (Schottky)<\/td>\n<\/tr>\n
Junction Capacitance<\/td>\n110pF (typ)<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n-65C to +125C<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nDO-41 (axial leaded)<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • Low forward voltage: 0.6V at 1A<\/li>\n
  • Fast switching (Schottky barrier)<\/li>\n
  • High surge current: 25A<\/li>\n
  • Low reverse leakage<\/li>\n
  • Lead-free options available<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • Buck converter catch diode<\/li>\n
    • Reverse polarity protection<\/li>\n
    • Power supply rectification<\/li>\n
    • Battery charging circuits<\/li>\n
    • Freewheeling diode for relays<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The 1N5819 is a 40V, 1A Schottky barrier rectifier diode in a DO-41 (DO-204AL) axial leaded package. With a low forward voltage drop of 0.6V at 1A and fast switching capability, it is widely used as a catch diode in buck converters, reverse polarity protection, and power supply rectification. Key Specifications Peak Repetitive […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[30,13],"tags":[],"chip_brand":[286],"class_list":["post-6419","post","type-post","status-publish","format-standard","hentry","category-ac-dc-converters","category-integrated-circuits-ics","chip_brand-generic"],"acf":{"brief_explanation":"40V 1A Schottky diode, 0.6V Vf, DO-41, buck converter catch diode","date_code":"","package_case":"DO-41 \/ DO-204AL (axial leaded)","in_stock":400000,"datasheet":"https:\/\/www.onsemi.com\/pdf\/datasheet\/1n5817-d.pdf","price":"$0.02 @ 1ku","product_introduction":"The 1N5819 is a 40V, 1A Schottky barrier rectifier diode in the industry-standard DO-41 axial package. Its key advantage over conventional silicon rectifiers is the low 0.6V forward voltage drop at 1A (versus 1.0V for standard diodes), which reduces power dissipation and improves efficiency in power applications. The Schottky barrier construction provides extremely fast switching with negligible reverse recovery time, making it ideal as a catch diode in switching regulators. The 25A surge current rating handles inrush and transient conditions. The 1N5819 is one of the most popular Schottky diodes for hobbyist and professional designs alike, commonly used with buck converters like the LM2596.","working_principle":"The 1N5819 uses a metal-semiconductor (Schottky) junction rather than a PN junction. When forward-biased, majority carriers (electrons) cross from the N-type semiconductor into the metal with minimal energy barrier, resulting in the low 0.6V forward voltage drop. Unlike PN junction diodes, Schottky diodes do not store minority carriers during forward conduction, so there is essentially no reverse recovery charge. This means the diode switches off almost instantly when the voltage reverses, eliminating the recovery losses that plague PN diodes in switching applications. The trade-off is higher reverse leakage current (1mA max at 40V) and lower maximum reverse voltage compared to PN junction diodes.","pin_description":"
      Terminal<\/th>Name<\/th>Marking<\/th>Description<\/th><\/tr>
      Anode<\/td>Anode<\/td>Band on cathode end<\/td>Positive terminal; connects to higher voltage<\/td><\/tr>
      Cathode<\/td>Cathode<\/td>Silver band<\/td>Negative terminal; connects to lower voltage<\/td><\/tr><\/table>","application_scenarios":"
      • Buck Converter Catch Diode:<\/b> Provides the freewheeling path for inductor current during switch OFF time in asynchronous buck regulators like LM2596 with 0.6V Vf reducing losses compared to 1N4007<\/li>
      • Reverse Polarity Protection:<\/b> Placed in series with the power input (anode toward source) so that reverse voltage reverse-biases the diode blocking current flow with only 0.6V drop during normal operation<\/li>
      • Solar Panel Blocking Diode:<\/b> Prevents battery discharge through solar panel at night with low 0.6V forward drop minimizing power loss during charging<\/li><\/ul>","alternative_models":"
        Model<\/th>VR<\/th>IF<\/th>Vf<\/th>Key Difference<\/th><\/tr>
        1N5817<\/td>20V<\/td>1A<\/td>0.45V<\/td>Lower voltage, lower Vf<\/td><\/tr>
        1N5818<\/td>30V<\/td>1A<\/td>0.55V<\/td>Lower voltage, lower Vf<\/td><\/tr>
        SS14<\/td>40V<\/td>1A<\/td>0.5V<\/td>SMD version (SMA)<\/td><\/tr>
        SS34<\/td>40V<\/td>3A<\/td>0.55V<\/td>Higher current (SMA)<\/td><\/tr>
        1N4007<\/td>1000V<\/td>1A<\/td>1.0V<\/td>Standard rectifier, slower<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6419","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/comments?post=6419"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6419\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=6419"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=6419"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=6419"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=6419"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}