{"id":7855,"date":"2026-06-28T02:53:10","date_gmt":"2026-06-28T02:53:10","guid":{"rendered":"https:\/\/materialparts.com\/moc3021m\/"},"modified":"2026-06-28T10:20:10","modified_gmt":"2026-06-28T10:20:10","slug":"moc3021m","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/moc3021m\/","title":{"rendered":"MOC3021M"},"content":{"rendered":"

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

The MOC3021M is a zero-crossing triac driver optocoupler from onsemi\/Fairchild with 400V blocking voltage, 530mA LED trigger current, and 7500V peak isolation in a 6-pin DIP package.<\/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\n\n\n\n\n
Output Device<\/td>\nTriac driver (zero-crossing)<\/td>\n<\/tr>\n
Peak Blocking Voltage<\/td>\n400V<\/td>\n<\/tr>\n
LED Trigger Current (IFT)<\/td>\n5mA typical, 15mA max<\/td>\n<\/tr>\n
LED Forward Voltage<\/td>\n1.15V typical at 10mA<\/td>\n<\/tr>\n
On-State RMS Current<\/td>\n100mA max<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u0639\u0632\u0644<\/td>\n7500V peak<\/td>\n<\/tr>\n
Zero-Crossing Voltage<\/td>\n20V max (inhibit voltage)<\/td>\n<\/tr>\n
dv\/dt Immunity<\/td>\n10V\/\u00b5s min<\/td>\n<\/tr>\n
Current Transfer Ratio<\/td>\nN\/A (triac output)<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n-40 \u062f\u0631\u062c\u0629 \u0645\u0626\u0648\u064a\u0629 \u0625\u0644\u0649 +85 \u062f\u0631\u062c\u0629 \u0645\u0626\u0648\u064a\u0629<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nDIP-6 (7.62 x 6.35mm, through-hole)<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • Zero-crossing detector reduces EMI and inrush current<\/li>\n
  • 400V peak blocking voltage for 240VAC operation<\/li>\n
  • 7500V peak isolation between input and output<\/li>\n
  • 5mA typical LED trigger current<\/li>\n
  • Zero-voltage crossing inhibits turn-on near peak AC<\/li>\n
  • High dv\/dt immunity: 10V\/\u00b5s minimum<\/li>\n
  • UL recognized and VDE approved<\/li>\n
  • Directly drives 25A power triacs<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • Solid-state relay (SSR) circuits<\/li>\n
    • AC motor speed control<\/li>\n
    • AC lamp dimming and on\/off control<\/li>\n
    • Heater and temperature control<\/li>\n
    • Industrial process control<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The MOC3021M is a zero-crossing triac driver optocoupler from onsemi\/Fairchild with 400V blocking voltage, 530mA LED trigger current, and 7500V peak isolation in a 6-pin DIP package. Key Specifications Output Device Triac driver (zero-crossing) Peak Blocking Voltage 400V LED Trigger Current (IFT) 5mA typical, 15mA max LED Forward Voltage 1.15V typical at 10mA […]<\/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":[13,20],"tags":[],"chip_brand":[182],"class_list":["post-7855","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-onsemi"],"acf":{"brief_explanation":"Zero-crossing triac driver optocoupler, 400V, 7500V isolation, DIP-6","date_code":"","package_case":"DIP-6 (7.62 x 6.35 x 5.08mm, 2.54mm pitch)","in_stock":11600,"datasheet":"https:\/\/www.onsemi.com\/pub\/Collateral\/MOC3021M-D.PDF","price":"$0.75 @ 1ku","product_introduction":"The MOC3021M is a zero-crossing triac driver optocoupler from onsemi designed for interfacing microcontrollers to AC power loads. It combines a GaAs infrared LED optically coupled to a zero-crossing triac driver chip. The zero-crossing detector ensures the triac turns on only when the AC voltage is near zero, minimizing inrush current and reducing electromagnetic interference. The 400V peak blocking voltage supports direct operation from 240VAC mains. The 7500V isolation voltage provides safe galvanic separation between the low-voltage control circuit and the high-voltage AC line. The 5mA typical trigger current is compatible with most MCU GPIO outputs. The output can directly drive gate currents of power triacs rated up to 25A.","working_principle":"The MOC3021M consists of a GaAs infrared LED optically coupled to a silicon detector chip that integrates a zero-crossing detector and a triac driver. When the LED is forward-biased, infrared light falls on the detector, turning on the zero-crossing detector circuit. The zero-crossing detector monitors the voltage across the main triac terminals (pins 4 and 6). If the AC line voltage is below approximately 20V (near zero crossing), the detector allows the driver triac to fire, applying gate current to the external power triac. If the AC voltage is above the zero-crossing threshold, the driver is inhibited until the next zero crossing. This zero-crossing turn-on minimizes the rate of change of current (di\/dt) in the load, reducing EMI and stress on the power triac. The 7500V isolation between the LED and the triac driver is achieved through the optical coupling path, which has no electrical connection. The driver triac is designed with high dv\/dt immunity (10V\/\u00b5s min) to prevent false triggering from fast voltage transients on the AC line. The LED trigger current of 5mA typical at room temperature increases at lower temperatures, requiring 15mA guaranteed trigger current over the full temperature range.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>Anode<\/td>Input<\/td>LED anode (connect via resistor to MCU)<\/td><\/tr>\n
      2<\/td>Cathode<\/td>Input<\/td>LED cathode (connect to MCU GND)<\/td><\/tr>\n
      3<\/td>NC<\/td>\u2014<\/td>No connect<\/td><\/tr>\n
      4<\/td>Main Terminal<\/td>Output<\/td>Triac driver main terminal (connect to power triac gate)<\/td><\/tr>\n
      5<\/td>NC<\/td>\u2014<\/td>No connect<\/td><\/tr>\n
      6<\/td>Main Terminal<\/td>Output<\/td>Triac driver main terminal (connect to AC line via resistor)<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • Solid-State Relays:<\/strong> 7500V isolation and zero-crossing turn-on create safe, EMI-compliant AC relay for MCU-controlled switching<\/li>\n
      • AC Motor Control:<\/strong> Zero-crossing switching extends triac life in motor start\/stop applications by reducing thermal stress<\/li>\n
      • Lamp Dimming:<\/strong> MOC3021 (non-zero-crossing variant) supports phase-angle dimming; MOC3021M suits on\/off switching<\/li>\n
      • Heater Control:<\/strong> Zero-crossing eliminates EMI that could interfere with sensitive temperature measurement circuits<\/li>\n
      • Industrial PLC Outputs:<\/strong> 5mA trigger current directly driven by PLC digital output; 400V blocking handles 240VAC mains<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Specs<\/th><\/tr>\n
        MOC3020M<\/td>onsemi<\/td>Non-zero-crossing version, phase-angle control<\/td>-<\/td>-<\/td><\/tr>\n
        MOC3041M<\/td>onsemi<\/td>Zero-crossing, 400V, same function<\/td>-<\/td>-<\/td><\/tr>\n
        MOC3061M<\/td>onsemi<\/td>Zero-crossing, 600V blocking voltage<\/td>-<\/td>-<\/td><\/tr>\n
        MOC3081M<\/td>onsemi<\/td>Zero-crossing, 800V blocking voltage<\/td>-<\/td>-<\/td><\/tr>\n
        VO2223A-X001<\/td>Vishay<\/td>Zero-crossing, 800V, integrated power triac<\/td>-<\/td>-<\/td><\/tr>\n<\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7855","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=7855"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7855\/revisions"}],"predecessor-version":[{"id":8284,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7855\/revisions\/8284"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=7855"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=7855"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=7855"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=7855"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}