MOC3021 Optocoupler 6 Pin Random Phase Opto Isolator Triac
Review: 5 - "A masterpiece of literature" by John Doe, written onMay 4, 20020
MOC3021 Optocoupler 6 Pin Random Phase Opto Isolator Triac
MOC3021 Optocoupler 6 Pin Random Phase Opto Isolator Triac_2
MOC3021 Optocoupler 6 Pin Random Phase Opto Isolator Triac

MOC3021 Optocoupler 6 Pin Random Phase Opto Isolator Triac

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  • Product SKU: INTEG069
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The MOC3021 is an optocoupler (also known as an opto-isolator) that is commonly used for interfacing low-voltage digital signals with high-voltage AC loads.

Here's some information about the MOC3021:

Optocoupler Functionality: An optocoupler is a component that transfers electrical signals using light waves to achieve electrical isolation between input and output. The MOC3021 specifically includes a photometric output.

Phototriac Output: The MOC3021 features a photometric output, which is a type of output that includes a triac coupled with the optocoupler. Triacs are semiconductor devices used for controlling AC power.

Isolation: The primary purpose of the MOC3021 is to provide electrical isolation between low-voltage control circuits (input side) and high-voltage AC loads (output side). This is crucial for safety and to prevent damage to sensitive components.


The MOC3021 is commonly used in applications where there is a need to control AC loads, such as in light dimmers, motor control, and other devices where isolation is essential.

Zero-Crossing Detection: Some optocouplers, including the MOC3021, are designed to work with zero-crossing detection circuits. This helps in minimizing electrical noise and reduces stress on the connected load during switching.

Usage Considerations: When using the MOC3021, consider the specific requirements of your application, the voltage and current ratings of the load, and the need for zero-crossing detection if applicable.


  • Excellent IFT stability—IR emitting diode has low degradation
  • High isolation voltage—minimum 5300 VAC RMS
  • Underwriters Laboratory (UL) recognized File E90700
  • Peak blocking voltage: 400V-MOC3021
  • VDE recognized (File #94766)


  • AC Light dimmers
  • Strode lights
  • AC motor speed control
  • Noise coupling circuits
  • Controlling AC loads using MCU/MPU
  • Ac/DC Power control

Physical Attributes

  • Length * Width * Height (mm): 8 x 8 x 7
  • Weight (gm) : 2


Package Includes

  • 1 xMOC3021 Optocoupler 6 Pin Random Phase Opto Isolator Triac

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