{"id":10346,"date":"2026-07-19T12:25:28","date_gmt":"2026-07-19T12:25:28","guid":{"rendered":"https:\/\/ic-vendor.com\/p4sma20a\/"},"modified":"2026-07-19T12:25:28","modified_gmt":"2026-07-19T12:25:28","slug":"p4sma20a","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/zh\/p4sma20a\/","title":{"rendered":"P4SMA20A"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

The P4SMA20A is a 400W unidirectional TVS diode from Littelfuse’s P4SMA series in a DO-214AC (SMA) surface-mount package. With a reverse standoff voltage of 20V, it provides transient voltage suppression for 15V-18V DC power rails and is a close neighbor to the P4SMA18A with slightly higher voltage rating.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Reverse Standoff Voltage (Vr)<\/td>\n20V<\/td>\n<\/tr>\n
Breakdown Voltage Min<\/td>\n22.2V<\/td>\n<\/tr>\n
Breakdown Voltage Max<\/td>\n24.5V<\/td>\n<\/tr>\n
Clamping Voltage (Vc)<\/td>\n32.4V<\/td>\n<\/tr>\n
Peak Pulse Power (10\/1000\u03bcs)<\/td>\n400W<\/td>\n<\/tr>\n
Peak Pulse Current (Ipp)<\/td>\n12.3A<\/td>\n<\/tr>\n
\u6781\u6027<\/td>\nUnidirectional<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nDO-214AC (SMA)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-55\u00b0C \u81f3 +150\u00b0C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 400W peak pulse power at 10\/1000\u03bcs<\/li>\n
  • Unidirectional \u2014 ideal for positive DC rails<\/li>\n
  • Low profile SMA (DO-214AC) package<\/li>\n
  • Excellent clamping capability<\/li>\n
  • RoHS compliant<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • 18V DC power rail protection<\/li>\n
    • Industrial control power supply protection<\/li>\n
    • Automotive 12V battery system (with margin)<\/li>\n
    • Telecom 20V supply protection<\/li>\n
    • General purpose transient suppression<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The P4SMA20A is a 400W unidirectional TVS diode from Littelfuse’s P4SMA series in a DO-214AC (SMA) surface-mount package. With a reverse standoff voltage of 20V, it provides transient voltage suppression for 15V-18V DC power rails and is a close neighbor to the P4SMA18A with slightly higher voltage rating. Key Specifications Reverse Standoff Voltage […]<\/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":[60],"tags":[1620,1607,1614],"chip_brand":[200],"class_list":["post-10346","post","type-post","status-publish","format-standard","hentry","category-passive-components","tag-p4sma20a","tag-tvs-diode","tag-unidirectional","chip_brand-littelfuse"],"acf":{"brief_explanation":"TVS Diode 400W Uni-Dir 20Vr 32.4Vc DO-214AC SMA, -55~150\u00b0C","date_code":"","package_case":"DO-214AC (SMA)","in_stock":13500,"datasheet":"https:\/\/www.littelfuse.com\/media?res=700089&download=1","price":"","product_introduction":"The P4SMA20A is a 400W unidirectional TVS diode from Littelfuse's P4SMA series, designed to protect 15V-18V DC power rails and signal interfaces against voltage transients. With a reverse standoff voltage of 20V and maximum clamping voltage of 32.4V, it offers slightly higher voltage headroom than the P4SMA18A for applications with higher nominal supply voltages. The compact SMA surface-mount package is suitable for high-density PCB layouts.","working_principle":"Under normal reverse-bias conditions below 20V, the P4SMA20A presents very high impedance with negligible leakage current. When a positive transient exceeds the breakdown voltage (22.2-24.5V), the avalanche junction rapidly turns on and clamps the voltage to 32.4V maximum at the rated peak pulse current of 12.3A. After the transient event, the device automatically returns to its high-impedance blocking state.","pin_description":"
      Pin<\/th>Function<\/th><\/tr>
      1<\/td>Cathode (identified by color band)<\/td><\/tr>
      2<\/td>Anode<\/td><\/tr><\/table>","application_scenarios":"
      • 18V regulated power supply output protection<\/li>
      • Industrial controller 24V nominal rail (with margin)<\/li>
      • Automotive 12V system with 20V standoff margin<\/li>
      • Telecom 20V supply and signal line protection<\/li>
      • General purpose DC power rail transient suppression<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Vr<\/th>Pppm<\/th>Notes<\/th><\/tr>
        Vishay<\/td>SMAJ20A<\/td>20V<\/td>400W<\/td>Direct cross<\/td><\/tr>
        STMicro<\/td>SMAJ20A<\/td>20V<\/td>400W<\/td>Direct cross<\/td><\/tr>
        Bourns<\/td>SMAJ20A<\/td>20V<\/td>400W<\/td>Direct cross<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10346","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/comments?post=10346"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10346\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/media?parent=10346"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/categories?post=10346"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/tags?post=10346"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=10346"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}