{"id":9338,"date":"2026-07-03T05:51:11","date_gmt":"2026-07-03T05:51:11","guid":{"rendered":"https:\/\/materialparts.com\/sz1sma30cat3g\/"},"modified":"2026-07-03T08:06:11","modified_gmt":"2026-07-03T08:06:11","slug":"sz1sma30cat3g","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/sz1sma30cat3g\/","title":{"rendered":"SZ1SMA30CAT3G"},"content":{"rendered":"

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

The SZ1SMA30CAT3G is a 600W transient voltage suppressor (TVS) diode from Littelfuse (formerly ON Semiconductor), featuring 30V standoff voltage and 48.4V maximum clamping voltage in a SMA (DO-214AC) surface-mount package. Bidirectional (C-type) configuration, AEC-Q101 qualified for automotive ESD and surge protection.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n
Standoff Voltage (VWM)<\/td>\n30V<\/td>\n<\/tr>\n
Breakdown Voltage (VBR)<\/td>\n33.3V – 36.8V<\/td>\n<\/tr>\n
Clamping Voltage (VC)<\/td>\n48.4V @ 10.4A (IPP)<\/td>\n<\/tr>\n
Peak Pulse Power (PPP)<\/td>\n600W (10\/1000us)<\/td>\n<\/tr>\n
\u914d\u7f6e<\/td>\nBidirectional (C-type)<\/td>\n<\/tr>\n
Package \/ Case<\/td>\nSMA (DO-214AC)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-55C to +150C<\/td>\n<\/tr>\n
\u8d44\u683c<\/td>\nAEC-Q101<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • AEC-Q101 automotive qualified<\/li>\n
  • Bidirectional protection for AC and DC lines<\/li>\n
  • 600W peak pulse power capability<\/li>\n
  • 30V standoff suitable for 24V automotive systems<\/li>\n
  • Low clamping voltage for effective protection<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Automotive 24V system surge protection<\/li>\n
    • ISO 7637 transient protection<\/li>\n
    • Industrial power supply input protection<\/li>\n
    • RS-485\/CAN bus line protection<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The SZ1SMA30CAT3G is a 600W transient voltage suppressor (TVS) diode from Littelfuse (formerly ON Semiconductor), featuring 30V standoff voltage and 48.4V maximum clamping voltage in a SMA (DO-214AC) surface-mount package. Bidirectional (C-type) configuration, AEC-Q101 qualified for automotive ESD and surge protection. Key Specifications Standoff Voltage (VWM) 30V Breakdown Voltage (VBR) 33.3V – 36.8V […]<\/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":[13,42],"tags":[768],"chip_brand":[200],"class_list":["post-9338","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-sensors","tag-sz1sma30cat3g","chip_brand-littelfuse"],"acf":{"brief_explanation":"30V 600W bidirectional TVS diode, SMA, 48.4V clamping, AEC-Q101 automotive grade","date_code":"","package_case":"SMA (DO-214AC) 5.2 x 2.6 x 2.15 mm","in_stock":36125,"datasheet":"https:\/\/www.littelfuse.com\/media?resourcetype=datasheet&itemid=75e0750e-33f2-4eb8-8f6c-37e1cdb0c6c6","price":"$0.12 @ 5ku","product_introduction":"The SZ1SMA30CAT3G is a 600W transient voltage suppressor (TVS) diode from Littelfuse, featuring 30V standoff voltage and 48.4V maximum clamping voltage in a SMA (DO-214AC) surface-mount package. Bidirectional (C-type) configuration, AEC-Q101 qualified. It provides robust protection against ESD, EFT, and surge transients for automotive 24V systems, industrial power supplies, and communication bus lines.","working_principle":"The SZ1SMA30CAT3G operates as a bidirectional transient voltage suppressor:\n\n1. Bidirectional (C-type): Two Zener diodes are connected in series back-to-back, providing symmetrical clamping in both positive and negative directions. This is ideal for protecting AC signals or DC lines that may experience both positive and negative transients.\n\n2. Standoff Voltage: The 30V VWM is the maximum continuous voltage the TVS can withstand without conducting. This provides margin for 24V automotive systems (typical 18V-32V operating range).\n\n3. Clamping Action: When a transient exceeds the breakdown voltage (33.3-36.8V), the TVS enters avalanche breakdown and clamps the voltage to 48.4V at the peak pulse current of 10.4A. This clamping level is low enough to protect downstream ICs rated for 40V or higher.\n\n4. Peak Pulse Power: 600W rating (10\/1000us waveform) means the TVS can safely absorb automotive surge events defined by ISO 7637 Pulse 1, 2a, 3a, and 3b.\n\n5. AEC-Q101: Automotive qualification ensures the TVS junction and package can withstand repeated surge events and thermal cycling without degradation.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>\n
      1<\/td>Cathode<\/td>Power<\/td>For positive transients: cathode to positive rail; bidirectional - either terminal<\/td><\/tr>\n
      2<\/td>Anode<\/td>Power<\/td>For negative transients: anode to ground; bidirectional - either terminal<\/td><\/tr>\n<\/table>\n

      Note: Bidirectional device - no polarity requirement. Either terminal can be connected to the protected line and the other to ground. For bidirectional protection across a signal pair, connect the TVS between the two lines.<\/p>","application_scenarios":"\n
      Application<\/th>Circuit Role<\/th>Key Requirement<\/th><\/tr>\n
      Automotive 24V System<\/td>Input surge protection<\/td>30V VWM, 600W, AEC-Q101<\/td><\/tr>\n
      ISO 7637<\/td>Transient protection on power lines<\/td>30V, bidirectional, SMA<\/td><\/tr>\n
      RS-485\/CAN Bus<\/td>Line-to-line surge protection<\/td>Bidirectional, 30V, 600W<\/td><\/tr>\n
      Industrial Power<\/td>Input TVS protection<\/td>30V standoff, 48.4V clamp<\/td><\/tr>\n
      Motor Controller<\/td>Supply voltage transient clamp<\/td>600W, SMA, auto grade<\/td><\/tr>\n<\/table>","alternative_models":"\n
      Manufacturer<\/th>Part Number<\/th>Package<\/th>Key Specs<\/th>Notes<\/th><\/tr>\n
      ON Semiconductor<\/td>1SMA30CAT3G<\/td>SMA<\/td>30V, 600W, bidirectional, AEC-Q101<\/td>Same device (original)<\/td><\/tr>\n
      Vishay<\/td>SMAJ30CA-E3\/61<\/td>SMA<\/td>30V, 400W, bidirectional<\/td>Lower power rating<\/td><\/tr>\n
      Bourns<\/td>SMAJ30CA<\/td>SMA<\/td>30V, 400W, bidirectional<\/td>Lower power rating<\/td><\/tr>\n
      STMicroelectronics<\/td>SMAJ30CA<\/td>SMA<\/td>30V, 400W, bidirectional<\/td>Lower power rating<\/td><\/tr>\n
      Diodes Inc.<\/td>SMAJ30CA-13-F<\/td>SMA<\/td>30V, 400W, bidirectional<\/td>Lower power rating<\/td><\/tr>\n<\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9338","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=9338"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9338\/revisions"}],"predecessor-version":[{"id":9370,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9338\/revisions\/9370"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=9338"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=9338"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=9338"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=9338"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}