The MOC3021SR2M is an optoisolator manufactured by ON Semiconductor. Here are the details related to this component:


  • Type: Optoisolator
  • Isolation Voltage: 4170Vrms
  • Number of Channels: 1
  • Current Transfer Ratio (Min/Max): 100% to 600%
  • Package / Case: 6-SMD
  • Voltage - Isolation: 7500Vrms
  • Current Transfer Ratio (CTR) (Min): 100% @ 10mA
  • Current Transfer Ratio (CTR) (Max): 600% @ 10mA
  • Voltage - Forward (Vf) (Typ): 1.15V
  • Current - DC Forward (If): 60mA
  • Current - Output / Channel: 50mA
  • Voltage - Output (Max): 400V
  • Turn On / Turn Off Time (Typ): 3µs, 3µs


The MOC3021SR2M is an optoisolator and contains an LED and a phototransistor, which are integrated within a single package. This device is primarily used to provide electrical isolation between a low voltage control signal and a high voltage output, such as a triac. The LED is activated by a low current control input, and the phototransistor output on the other side of the isolation barrier is then used to control a separate high voltage circuit, typically a triac.


Optoisolators are frequently used in applications where electrical isolation is required, including:

  • Triac and Thyristor Drivers: The MOC3021SR2M is commonly used for driving the gate of a triac or thyristor in AC switching applications, providing isolation between the control circuitry and the high voltage AC load.
  • Industrial Controls: These components are widely used in industrial and consumer appliances to achieve electrical isolation, ensuring safety and noise immunity.

The MOC3021SR2M, due to its high isolation voltage and current transfer ratio, can be used in various applications to isolate and control high voltage circuits, providing vital safety features and noise reduction.

DataSheet MOC3021SR2M PDF

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