MOC3063: Overview,parameter,Main uses,Features,application fields,working principle and alternative models

MOC3063 Optocoupler Overview:


The MOC3063 is an optocoupler device that integrates a light-emitting diode (LED) and a phototriac in a single package. It is commonly used for isolating high-voltage circuits from low-voltage components while allowing for signal communication through light.



  • Isolation Voltage: Voltage rating that specifies the maximum isolation capability between input and output.
  • Trigger Current: Current required to activate the optocoupler.
  • Response Time: Time taken for the optocoupler to switch on/off in response to input signals.
  • Operating Temperature Range: Range of temperatures within which the optocoupler functions reliably.
  • Package Type: Physical form factor and pin configuration of the device.
  • DataSheet MOC3063 PDF

Main Uses:

  • Isolation: Provides electrical isolation between high-voltage and low-voltage circuits.
  • Switching Applications: Controls power switching in circuits.
  • Noise Immunity: Filters out noise and interference in signal transmission.
  • Feedback Control: Enables feedback loops in control systems.


  • Optical Coupling: Uses light to transmit signals, ensuring electrical isolation.
  • Compact Design: Integrates LED and phototriac in a single package for convenience.
  • High Isolation Voltage: Offers a high degree of isolation between input and output.
  • Noise Immunity: Resistant to electrical noise and interference.
  • Fast Response Time: Enables quick switching and response to input signals.

Application Fields:

  • Solid-State Relays: Used for controlling high-power loads without direct electrical connections.
  • Motor Control: Facilitates isolated control of motors in industrial applications.
  • Light Dimming Circuits: Enables isolated control of lighting systems.
  • Power Control Systems: Used in isolated feedback loops for precise power management.

Working Principle:

  • Input Side: The LED emits light when current flows through it based on the input signal.
  • Output Side: The phototriac responds to the light signal, triggering its conduction.
  • Isolation: The absence of direct electrical connection between input and output ensures isolation.
  • Signal Transmission: Information is transmitted optically, enabling communication between isolated circuits.

Alternative Models:

  • MOC3041: Optocoupler with similar functionality and characteristics.
  • MOC3021: Another optocoupler commonly used for isolation and switching applications.
  • FOD3180: Optocoupler with enhanced features for specific requirements.

The MOC3063 optocoupler serves as a reliable means of isolating electrical circuits while allowing signal communication through light. For alternative options like the MOC3041 or MOC3021, engineers can choose based on specific application requirements, such as isolation voltage, response time, and package type. Consult datasheets for detailed specifications and performance characteristics when selecting the most suitable optocoupler for a given application.

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