{"id":9579,"date":"2026-07-04T04:21:28","date_gmt":"2026-07-04T04:21:28","guid":{"rendered":"https:\/\/materialparts.com\/smbj20ca\/"},"modified":"2026-07-04T04:21:28","modified_gmt":"2026-07-04T04:21:28","slug":"smbj20ca","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/smbj20ca\/","title":{"rendered":"SMBJ20CA"},"content":{"rendered":"

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

The SMBJ20CA is a Littelfuse bidirectional transient voltage suppressor (TVS) diode designed to protect sensitive electronics from voltage transients and ESD events. With a standoff voltage of 20V and 600W peak pulse power rating in an SMB (DO-214AA) surface-mount package, this device provides robust bidirectional protection for power rails and data lines.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n
Standoff Voltage (VWM)<\/td>\n20V<\/td>\n<\/tr>\n
Breakdown Voltage (VBR)<\/td>\n22.2V min \/ 24.5V max<\/td>\n<\/tr>\n
Clamping Voltage (VC)<\/td>\n32.4V @ IPP<\/td>\n<\/tr>\n
Peak Pulse Power (PPP)<\/td>\n600W (10\/1000 µs)<\/td>\n<\/tr>\n
Peak Pulse Current (IPP)<\/td>\n18.5A<\/td>\n<\/tr>\n
Leakage Current (ID)<\/td>\n1 µA max @ VWM<\/td>\n<\/tr>\n
Direction<\/td>\nBidirectional (CA)<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSMB (DO-214AA)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Bidirectional protection for AC and DC signal lines<\/li>\n
  • 600W peak pulse power dissipation for robust surge protection<\/li>\n
  • Low clamping voltage (32.4V) ensures effective protection of downstream components<\/li>\n
  • Low leakage current (1 µA max) minimizes power consumption during normal operation<\/li>\n
  • IEC 61000-4-2 ESD protection compliance (15kV air \/ 8kV contact)<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • 20V power rail transient protection in industrial equipment<\/li>\n
    • RS-485 and CAN bus ESD and surge protection<\/li>\n
    • Telecom line interface voltage transient suppression<\/li>\n
    • Automotive electronic control unit (ECU) input protection<\/li>\n
    • Solar panel and battery management system overvoltage protection<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The SMBJ20CA is a Littelfuse bidirectional transient voltage suppressor (TVS) diode designed to protect sensitive electronics from voltage transients and ESD events. With a standoff voltage of 20V and 600W peak pulse power rating in an SMB (DO-214AA) surface-mount package, this device provides robust bidirectional protection for power rails and data lines. Key […]<\/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":[54,13],"tags":[823],"chip_brand":[200],"class_list":["post-9579","post","type-post","status-publish","format-standard","hentry","category-diodes","category-integrated-circuits-ics","tag-smbj20ca","chip_brand-littelfuse"],"acf":{"brief_explanation":"Bidirectional 600W TVS diode, 20V standoff, 32.4V clamping, SMB package for surge and ESD protection","date_code":"","package_case":"SMB (DO-214AA)","in_stock":6606,"datasheet":"https:\/\/www.littelfuse.com\/media?resourcetype=datasheet&itemid=75e04cb0-85f4-424f-83da-62554e637da3","price":"$0.18 @ 1ku","product_introduction":"The SMBJ20CA is a Littelfuse bidirectional transient voltage suppressor (TVS) diode rated for 600W peak pulse power (10\/1000 \u00b5s waveform) with a 20V working standoff voltage in an SMB (DO-214AA) surface-mount package. The bidirectional configuration (CA suffix) provides symmetrical clamping for both positive and negative transients, making it ideal for AC signal lines and differential data buses. The device clamps at 32.4V under peak pulse current (18.5A) and features ultra-low leakage current of 1 \u00b5A maximum at the standoff voltage.","working_principle":"The SMBJ20CA operates as a voltage-clamping device using avalanche breakdown in its PN junction. Under normal operating conditions (voltage below 20V standoff), the TVS presents high impedance with minimal leakage current (<1 \u00b5A). When a transient voltage exceeds the breakdown voltage (22.2-24.5V), the device enters avalanche conduction, shunting the transient current away from protected circuitry. The bidirectional configuration uses two back-to-back PN junctions to provide symmetrical clamping for both positive and negative transients, limiting the voltage to the clamping voltage (32.4V) during surge events.","pin_description":"
      Pin<\/th>Function<\/th><\/tr>
      Cathode 1<\/td>Positive clamping terminal \/ anode of reverse junction<\/td><\/tr>
      Cathode 2<\/td>Negative clamping terminal \/ cathode of forward junction<\/td><\/tr><\/table>","application_scenarios":"
      • 20V DC power rail protection against load dump and inductive transients<\/li>
      • RS-485 transceiver bus ESD and surge protection on differential lines<\/li>
      • Automotive CAN bus transient suppression in vehicle networks<\/li>
      • Telecom SLIC interface overvoltage protection<\/li>
      • Solar panel string reverse voltage and lightning surge protection<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Key Difference<\/th><\/tr>
        SMBJ20A<\/td>Littelfuse<\/td>Unidirectional version<\/td><\/tr>
        SMBJ20CAQ<\/td>Littelfuse<\/td>AEC-Q101 automotive qualified<\/td><\/tr>
        P6KE20CA<\/td>STMicroelectronics<\/td>600W through-hole DO-15 package<\/td><\/tr>
        SMBG20CA<\/td>STMicroelectronics<\/td>Equivalent SMB bidirectional TVS<\/td><\/tr>
        SMBJ15CA<\/td>Littelfuse<\/td>Lower voltage variant (15V standoff)<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9579","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=9579"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9579\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=9579"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=9579"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=9579"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=9579"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}