{"id":6420,"date":"2026-06-16T03:11:30","date_gmt":"2026-06-16T03:11:30","guid":{"rendered":"https:\/\/materialparts.com\/ss34\/"},"modified":"2026-06-16T03:11:30","modified_gmt":"2026-06-16T03:11:30","slug":"ss34","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/ss34\/","title":{"rendered":"SS34"},"content":{"rendered":"

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

The SS34 is a 40V, 3A Schottky barrier rectifier diode in an SMA (DO-214AC) surface-mount package. With a low forward voltage drop of 0.55V at 3A and fast switching, it is widely used as a catch diode in buck converters, reverse polarity protection, and freewheeling applications in space-constrained designs.<\/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
Peak Repetitive Reverse Voltage<\/td>\n40V<\/td>\n<\/tr>\n
Average Rectified Forward Current<\/td>\n3A<\/td>\n<\/tr>\n
Peak Forward Surge Current<\/td>\n80A (8.3ms)<\/td>\n<\/tr>\n
Forward Voltage<\/td>\n0.55V (max at IF=3A)<\/td>\n<\/tr>\n
Reverse Current<\/td>\n0.5mA (max at VR=40V)<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n-55C to +150C<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nSMA (DO-214AC)<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • 3A current rating in compact SMA package<\/li>\n
  • Low forward voltage: 0.55V at 3A<\/li>\n
  • Fast switching (Schottky barrier)<\/li>\n
  • 80A surge current capability<\/li>\n
  • Low reverse leakage<\/li>\n
  • Surface-mount SMA package<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • Buck converter catch diode (3A class)<\/li>\n
    • Reverse polarity protection<\/li>\n
    • Freewheeling diode<\/li>\n
    • DC-DC converter output rectification<\/li>\n
    • Battery powered equipment<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The SS34 is a 40V, 3A Schottky barrier rectifier diode in an SMA (DO-214AC) surface-mount package. With a low forward voltage drop of 0.55V at 3A and fast switching, it is widely used as a catch diode in buck converters, reverse polarity protection, and freewheeling applications in space-constrained designs. 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-6420","post","type-post","status-publish","format-standard","hentry","category-ac-dc-converters","category-integrated-circuits-ics","chip_brand-generic"],"acf":{"brief_explanation":"40V 3A Schottky diode, 0.55V Vf, SMA (DO-214AC), SMD catch diode","date_code":"","package_case":"SMA \/ DO-214AC (5.20 x 2.60 x 2.15 mm)","in_stock":300000,"datasheet":"https:\/\/www.mccsemi.com\/pdf\/Diodes\/SS3x-SMA.pdf","price":"$0.03 @ 1ku","product_introduction":"The SS34 is a 40V, 3A Schottky barrier rectifier diode in an SMA (DO-214AC) surface-mount package. It offers the same low-forward-voltage, fast-switching advantages of Schottky technology as the 1N5819, but with triple the current rating and a compact surface-mount footprint. The 0.55V forward voltage at 3A reduces power dissipation compared to silicon PN diodes (typically 1.0-1.2V), improving efficiency in power conversion circuits. The 80A surge current rating handles transient conditions robustly. The SMA package is the most popular SMD diode footprint, providing a good balance between current handling and board area. The SS34 is commonly used with buck converters like the LM2596 and MP1584.","working_principle":"The SS34 uses a metal-semiconductor (Schottky) junction. When forward-biased, majority carriers cross from N-type semiconductor into the metal with a low energy barrier, resulting in 0.55V forward drop at 3A. The absence of minority carrier storage means negligible reverse recovery time, enabling very fast switching. This makes Schottky diodes ideal for high-frequency switching applications where PN diode recovery losses would be prohibitive. The trade-off is higher reverse leakage current compared to PN junction diodes and lower maximum reverse voltage ratings.","pin_description":"
      Terminal<\/th>Name<\/th>Marking<\/th>Description<\/th><\/tr>
      1<\/td>Anode<\/td>-<\/td>Positive terminal (no band side)<\/td><\/tr>
      2<\/td>Cathode<\/td>Band\/stripe<\/td>Negative terminal (band side)<\/td><\/tr><\/table>","application_scenarios":"
      • Buck Converter Catch Diode:<\/b> Provides freewheeling path in 3A-class buck regulators (LM2596, MP1584) with 0.55V Vf reducing conduction losses at 2-3A versus silicon diode alternatives<\/li>
      • Reverse Polarity Protection:<\/b> Series diode at power input with only 0.55V drop at full load protecting downstream circuitry from reverse connection<\/li>
      • DC Motor Freewheeling:<\/b> Protects MOSFET drivers from inductive kickback when motor is switched off with 80A surge capability absorbing back-EMF energy<\/li><\/ul>","alternative_models":"
        Model<\/th>VR<\/th>IF<\/th>Vf<\/th>Key Difference<\/th><\/tr>
        SS14<\/td>40V<\/td>1A<\/td>0.5V<\/td>Lower current, same package<\/td><\/tr>
        SS24<\/td>40V<\/td>2A<\/td>0.5V<\/td>2A version<\/td><\/tr>
        SS54<\/td>40V<\/td>5A<\/td>0.55V<\/td>5A version (SMC package)<\/td><\/tr>
        1N5819<\/td>40V<\/td>1A<\/td>0.6V<\/td>Through-hole DO-41<\/td><\/tr>
        SB340<\/td>40V<\/td>3A<\/td>0.55V<\/td>Equivalent, different vendor<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6420","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=6420"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6420\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=6420"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=6420"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=6420"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=6420"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}