{"id":8383,"date":"2026-06-28T13:39:34","date_gmt":"2026-06-28T13:39:34","guid":{"rendered":"https:\/\/materialparts.com\/mmsz5231bt1g\/"},"modified":"2026-06-28T13:39:34","modified_gmt":"2026-06-28T13:39:34","slug":"mmsz5231bt1g","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/mmsz5231bt1g\/","title":{"rendered":"MMSZ5231BT1G"},"content":{"rendered":"

\u0646\u0638\u0631\u0629 \u0639\u0627\u0645\u0629 \u0639\u0644\u0649 \u0627\u0644\u0645\u0646\u062a\u062c<\/h2>\n

The MMSZ5231BT1G from onsemi is a 5.1 V Zener diode in a SOD-123 package. With 5% tolerance, 500 mW power dissipation, and 17 \u03a9 dynamic impedance, it provides reliable voltage regulation and reference for 5 V logic systems.<\/p>\n

\u0627\u0644\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0631\u0626\u064a\u0633\u064a\u0629<\/h2>\n\n\n\n\n\n\n\n
Zener Voltage (VZ)<\/td>\n5.1 V (nominal), 4.85-5.36 V (range)<\/td>\n<\/tr>\n
Tolerance<\/td>\n5% (B suffix)<\/td>\n<\/tr>\n
\u062a\u0628\u062f\u064a\u062f \u0627\u0644\u0637\u0627\u0642\u0629<\/td>\n500 mW<\/td>\n<\/tr>\n
Zener Impedance<\/td>\n17 \u03a9 @ IZT = 20 mA<\/td>\n<\/tr>\n
Leakage Current<\/td>\n5 \u00b5A @ VR = 2 V<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nSOD-123<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • 5.1 V nominal Zener voltage with 5% tolerance<\/li>\n
  • Low 17 \u03a9 dynamic impedance for stable regulation<\/li>\n
  • 500 mW power rating in compact SOD-123<\/li>\n
  • Pb-Free, Halogen Free, and RoHS compliant<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • 5 V logic voltage regulation and clamping<\/li>\n
    • Overvoltage protection for USB and TTL logic<\/li>\n
    • Voltage reference for comparators<\/li>\n
    • Signal clipping and level shifting<\/li>\n
    • General-purpose shunt regulation<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The MMSZ5231BT1G from onsemi is a 5.1 V Zener diode in a SOD-123 package. With 5% tolerance, 500 mW power dissipation, and 17 \u03a9 dynamic impedance, it provides reliable voltage regulation and reference for 5 V logic systems. Key Specifications Zener Voltage (VZ) 5.1 V (nominal), 4.85-5.36 V (range) Tolerance 5% (B suffix) […]<\/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":[],"chip_brand":[144],"class_list":["post-8383","post","type-post","status-publish","format-standard","hentry","category-insulated-gate-bipolar-transistors-igbt","category-integrated-circuits-ics","chip_brand-on"],"acf":{"brief_explanation":"5.1V Zener diode, 5%, 500mW, 17ohm, SOD-123, voltage regulation","date_code":"","package_case":"SOD-123 (2.65 x 1.60 x 0.90 mm)","in_stock":5200,"datasheet":"https:\/\/www.onsemi.com\/download\/data-sheet\/pdf\/mmsz5231b-d.pdf","price":"$0.02 @ 1ku","product_introduction":"The MMSZ5231BT1G from onsemi is a 5.1 V nominal Zener diode in a SOD-123 surface-mount package. The B suffix indicates 5% voltage tolerance with a Zener voltage range of 4.85 V to 5.36 V at IZT = 20 mA. With a low dynamic impedance of 17 \u03a9, the device provides stable voltage regulation that varies only 340 mV over a 20 mA change in Zener current. The 500 mW power dissipation rating supports applications requiring up to 85 mA of Zener current at the nominal voltage. The SOD-123 package is compatible with standard surface-mount assembly processes. Pb-Free, Halogen Free, and RoHS compliant. The T1 suffix indicates 3000-unit tape and reel packaging.","working_principle":"The MMSZ5231BT1G operates in the reverse breakdown region where the Zener diode maintains a relatively constant voltage across its terminals. When reverse-biased above 5.1 V, the diode enters avalanche breakdown and conducts current while maintaining the Zener voltage. The low dynamic impedance of 17 \u03a9 at IZT ensures that the Zener voltage changes only 17 mV per mA change in Zener current, providing a stable reference. In a shunt regulator circuit, a series resistor drops the supply voltage to the Zener voltage, and the Zener diode shunts excess current to regulate the output. The device can also be used as a voltage clamp, limiting signal or supply transients to approximately 5.1 V.","pin_description":"
      Pin<\/th>Name<\/th>Function<\/th><\/tr>
      1<\/td>Cathode<\/td>Positive terminal during Zener operation; marked with bar<\/td><\/tr>
      2<\/td>Anode<\/td>Negative terminal during Zener operation; connects to ground<\/td><\/tr><\/table>","application_scenarios":"
      • 5 V Rail Clamping<\/strong>: Overvoltage protection and shunt regulation for 5 V TTL and CMOS logic power rails<\/li>
      • USB VBUS Protection<\/strong>: Voltage clamping for USB 5 V power bus against transient overvoltage<\/li>
      • Voltage Reference<\/strong>: Low-cost 5.1 V reference for comparator and op-amp circuits<\/li>
      • Signal Clipping<\/strong>: Limiting analog signal swings to the 5.1 V domain in mixed-voltage systems<\/li>
      • Relay Driver Snubber<\/strong>: Clamp inductive kickback to 5.1 V in relay and solenoid driver circuits<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>VZ<\/th>Tol<\/th>Pd<\/th>Package<\/th>Notes<\/th><\/tr>
        MMSZ5231B-7-F<\/td>Diodes Inc<\/td>5.1 V<\/td>5%<\/td>500 mW<\/td>SOD-123<\/td>Direct equivalent<\/td><\/tr>
        BZX55C5V1<\/td>Nexperia<\/td>5.1 V<\/td>5%<\/td>500 mW<\/td>DO-35<\/td>Through-hole equivalent<\/td><\/tr>
        BZT52C5V1-7-F<\/td>Diodes Inc<\/td>5.1 V<\/td>5%<\/td>500 mW<\/td>SOD-123<\/td>Alternative from Diodes Inc<\/td><\/tr>
        MM3Z5V1ST1G<\/td>onsemi<\/td>5.1 V<\/td>5%<\/td>200 mW<\/td>SOD-523<\/td>Smaller package, lower Pd<\/td><\/tr>
        1N5231B-TR<\/td>onsemi<\/td>5.1 V<\/td>5%<\/td>500 mW<\/td>DO-35<\/td>Through-hole version<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/8383","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/comments?post=8383"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/8383\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=8383"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=8383"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=8383"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=8383"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}