{"id":9541,"date":"2026-07-03T08:47:10","date_gmt":"2026-07-03T08:47:10","guid":{"rendered":"https:\/\/materialparts.com\/smf12a\/"},"modified":"2026-07-03T08:47:10","modified_gmt":"2026-07-03T08:47:10","slug":"smf12a","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/smf12a\/","title":{"rendered":"SMF12A"},"content":{"rendered":"

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

The SMF12A is a 200 W transient voltage suppression (TVS) diode in a SOD-123FL package, providing unidirectional protection for 12 V circuits. With 12 V standoff voltage, 13.3 V minimum breakdown, and 19.9 V clamping voltage at 10 A peak current, it protects sensitive electronics from ESD, EFT, and surge events.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Standoff Voltage (Vrwm)<\/td>\n12 V<\/td>\n<\/tr>\n
Breakdown Voltage (Vbr)<\/td>\n13.3 – 14.7 V @ 1mA<\/td>\n<\/tr>\n
Clamping Voltage (Vc)<\/td>\n19.9 V @ Ipp=10.05A<\/td>\n<\/tr>\n
Peak Pulse Power (Pppm)<\/td>\n200 W (10\/1000 us)<\/td>\n<\/tr>\n
Peak Pulse Current (Ipp)<\/td>\n10.1 A<\/td>\n<\/tr>\n
Leakage Current<\/td>\n2.5 uA @ 12V<\/td>\n<\/tr>\n
\u6781\u6027<\/td>\nUnidirectional<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOD-123FL<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-55\u81f3+150\u6444\u6c0f\u5ea6<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 12 V standoff for protecting 12V logic and power rails<\/li>\n
  • 200 W peak pulse power handling<\/li>\n
  • Low clamping voltage: 19.9 V at 10 A<\/li>\n
  • Low leakage current: 2.5 uA at standoff<\/li>\n
  • Unidirectional protection for DC circuits<\/li>\n
  • SOD-123FL low-profile package<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • 12 V I\/O port ESD protection<\/li>\n
    • VCC bus voltage transient suppression<\/li>\n
    • USB and Ethernet port surge protection<\/li>\n
    • Automotive 12V bus protection<\/li>\n
    • Battery-powered device overvoltage protection<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The SMF12A is a 200 W transient voltage suppression (TVS) diode in a SOD-123FL package, providing unidirectional protection for 12 V circuits. With 12 V standoff voltage, 13.3 V minimum breakdown, and 19.9 V clamping voltage at 10 A peak current, it protects sensitive electronics from ESD, EFT, and surge events. Key Specifications […]<\/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":[57,13],"tags":[783],"chip_brand":[179],"class_list":["post-9541","post","type-post","status-publish","format-standard","hentry","category-insulated-gate-bipolar-transistors-igbt","category-integrated-circuits-ics","tag-smf12a","chip_brand-gigadevice"],"acf":{"brief_explanation":"12V 200W TVS diode, unidirectional, SOD-123FL","date_code":"","package_case":"SOD-123FL (3.7 x 1.6 x 1.05 mm)","in_stock":6016,"datasheet":"https:\/\/www.littelfuse.com\/media\/?resourcetype=datasheet&id=7835","price":"$0.12 @ 1ku","product_introduction":"The SMF12A is a 200 W unidirectional transient voltage suppression (TVS) diode designed to protect 12 V circuits from electrostatic discharge (ESD), electrical fast transients (EFT), and surge events. It features 12 V standoff voltage, 13.3-14.7 V breakdown, and 19.9 V clamping at 10.1 A peak pulse current. The SOD-123FL low-profile package suits high-density PCBs in smartphones, portable devices, and automotive electronics. With only 2.5 uA leakage at standoff voltage, it minimizes power consumption in always-on protection circuits.","working_principle":"The SMF12A operates as an avalanche diode designed to conduct heavily when the voltage across it exceeds the breakdown threshold. Under normal operating conditions (below 12 V), the device presents high impedance with only 2.5 uA leakage. When a transient voltage exceeds the breakdown voltage (13.3-14.7 V), the device avalanches and clamps the voltage to a safe level (19.9 V at full rated current). The clamping action is essentially instantaneous (sub-nanosecond response). The 200 W peak pulse power rating is specified for an 8\/20 us or 10\/1000 us waveform, with energy absorption limited by the thermal capacity of the junction and package.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>\n
      1<\/td>Cathode<\/td>Output<\/td>Cathode (marked with band, connects to protected line)<\/td><\/tr>\n
      2<\/td>Anode<\/td>Ground<\/td>Anode (connects to ground)<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • 12 V I\/O port ESD protection<\/li>\n
      • VCC bus voltage transient suppression<\/li>\n
      • USB and Ethernet port surge protection<\/li>\n
      • Automotive 12V bus protection<\/li>\n
      • Battery-powered device overvoltage protection<\/li>\n<\/ul>","alternative_models":"\n
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>\n
        Littelfuse<\/td>SMF12A<\/td>SOD-123FL<\/td>Original manufacturer equivalent<\/td><\/tr>\n
        Diotec<\/td>SMF12A<\/td>SOD-123FL<\/td>Second-source equivalent<\/td><\/tr>\n
        onsemi<\/td>SMBJ12A<\/td>SMB<\/td>Higher power 600W version<\/td><\/tr>\n
        Bourns<\/td>SMBJ12A<\/td>SMB<\/td>Alternative higher power TVS<\/td><\/tr>\n<\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9541","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/comments?post=9541"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9541\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=9541"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=9541"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=9541"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=9541"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}