{"id":3670,"date":"2026-06-07T13:32:39","date_gmt":"2026-06-07T13:32:39","guid":{"rendered":"https:\/\/materialparts.com\/smbj30ca\/"},"modified":"2026-06-07T13:32:39","modified_gmt":"2026-06-07T13:32:39","slug":"smbj30ca","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/smbj30ca\/","title":{"rendered":"SMBJ30CA"},"content":{"rendered":"

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

The SMBJ30CA is a 600W bidirectional transient voltage suppressor (TVS) diode in a DO-214AA (SMB) surface-mount package. With 30V standoff voltage, 33.3V minimum breakdown, and 48.4V maximum clamping voltage at 12.4A, it provides reliable surge protection for 24V-28V power rails and communication lines.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n
\u7c7b\u578b<\/td>\nBidirectional TVS Diode<\/td>\n<\/tr>\n
Standoff Voltage (VRWM)<\/td>\n30 V<\/td>\n<\/tr>\n
Breakdown Voltage (VBR)<\/td>\n33.3V min \/ 36.8V max<\/td>\n<\/tr>\n
Clamping Voltage (VC)<\/td>\n48.4 V max @ IPP=12.4A<\/td>\n<\/tr>\n
Peak Pulse Current (IPP)<\/td>\n12.4 A (10\/1000us)<\/td>\n<\/tr>\n
Peak Pulse Power (PPPM)<\/td>\n600 W (10\/1000us)<\/td>\n<\/tr>\n
Reverse Leakage (IR)<\/td>\n1 uA max @ 30V<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-55 to +150 C (TJ)<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nDO-214AA (SMB)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 600W peak pulse power (10\/1000us)<\/li>\n
  • 30V standoff voltage for 24V\/28V systems<\/li>\n
  • Bidirectional protection for AC and DC lines<\/li>\n
  • 48.4V low clamping voltage at rated current<\/li>\n
  • 1uA maximum reverse leakage current<\/li>\n
  • Fast response time (virtually instantaneous)<\/li>\n
  • Planar technology for low leakage and high reliability<\/li>\n
  • MSL Level 1 (no dry pack required)<\/li>\n
  • IEC 61000-4-2 ESD protection up to 30kV<\/li>\n
  • IEC 61000-4-5 surge protection<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • 24V\/28V DC power rail surge protection<\/li>\n
    • Industrial automation power line protection<\/li>\n
    • Automotive electronics load dump protection<\/li>\n
    • Telecom power supply transient suppression<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The SMBJ30CA is a 600W bidirectional transient voltage suppressor (TVS) diode in a DO-214AA (SMB) surface-mount package. With 30V standoff voltage, 33.3V minimum breakdown, and 48.4V maximum clamping voltage at 12.4A, it provides reliable surge protection for 24V-28V power rails and communication lines. Key Specifications Type Bidirectional TVS Diode Standoff Voltage (VRWM) 30 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,20],"tags":[],"chip_brand":[142],"class_list":["post-3670","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-st"],"acf":{"brief_explanation":"600W bidirectional TVS, 30V standoff, 48.4V clamp, DO-214AA (SMB)","date_code":"","package_case":"DO-214AA (SMB) (4.60 x 3.94 x 2.10 mm)","in_stock":43392,"datasheet":"https:\/\/www.st.com\/resource\/en\/datasheet\/smbj.pdf","price":"$0.14 @ 1ku","product_introduction":"The SMBJ30CA is a 600W bidirectional transient voltage suppressor (TVS) diode in a DO-214AA (SMB) surface-mount package. The CA suffix indicates bidirectional (symmetrical clamping in both positive and negative directions). With 30V standoff voltage, it is specifically designed for 24V and 28V nominal DC bus applications commonly found in industrial automation, telecom, and automotive systems. The 48.4V maximum clamping voltage at 12.4A peak pulse current ensures protected components see limited voltage excursions during surge events. The planar technology construction provides low leakage current (0.2uA typical at 25C) and high junction temperature capability (150C max) for reliable long-term operation.","working_principle":"The SMBJ30CA operates through bidirectional avalanche clamping: (1) Normal Operation: When the voltage across the device is below the 30V standoff voltage, both internal avalanche diodes are in their high-impedance reverse-biased state, with less than 1uA leakage current. This makes the TVS effectively invisible to the protected circuit. (2) Surge Clamping: When a transient voltage exceeds the breakdown voltage (33.3V minimum) in either direction, the corresponding avalanche diode conducts, clamping the voltage. At the rated peak pulse current of 12.4A, the voltage is clamped to a maximum of 48.4V. (3) Energy Dissipation: The TVS absorbs the transient energy by converting it to heat in the semiconductor junction. The 600W peak pulse power is rated for a 10\/1000us IEC 61000-4-5 waveform. The device also withstands 4kW (8\/20us) short-duration surges. The response time is in the picosecond range, providing protection before downstream components can be damaged.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>
      1<\/td>Terminal 1<\/td>Bidirectional<\/td>No polarity (bidirectional device)<\/td><\/tr>
      2<\/td>Terminal 2<\/td>Bidirectional<\/td>No polarity (bidirectional device)<\/td><\/tr><\/table>","application_scenarios":"
      • 24V industrial DC bus surge protection with 600W peak pulse power and 30V standoff<\/li>
      • 28V telecom power supply transient suppression with bidirectional clamping to 48.4V<\/li>
      • Automotive 24V system load dump protection with IEC 61000-4-5 surge rating<\/li>
      • Industrial sensor power line ESD protection with 30kV air discharge rating<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>VRWM<\/th>PPPM<\/th>Notes<\/th><\/tr>
        SMBJ30A<\/td>Various<\/td>30V<\/td>600W<\/td>Unidirectional version<\/td><\/tr>
        SMCJ30CA<\/td>Various<\/td>30V<\/td>1500W<\/td>Higher power version<\/td><\/tr>
        SMBJ33CA<\/td>Various<\/td>33V<\/td>600W<\/td>Higher voltage option<\/td><\/tr>
        SMF30CA<\/td>Various<\/td>30V<\/td>200W<\/td>Smaller package, lower power<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/3670","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=3670"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/3670\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=3670"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=3670"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=3670"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=3670"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}