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MOC3021 Triac Driver Optocoupler/Opto-Isolator IC

SKU: 9PVIDRISLC
The MOC3021 is an optically isolated triac driver IC designed for controlling TRIACs and AC loads while providing complete electrical isolation between low-voltage control circuits and high-voltage AC power circuits. It integrates an infrared LED and a light-activated bilateral switch (phototriac) within a compact package, enabling safe and reliable switching of mains-powered devices. Unlike zero-cross optocouplers, the MOC3021 features random-phase...
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Specifications

Specifications:

Component Type: Optocoupler / Opto-Isolator
Model: MOC3021
Output Type: Phototriac Driver
Package Type: DIP-6
Number of Channels: 1 Channel
Isolation Voltage: 5300Vrms Typical
Input LED Forward Voltage: 1.15V Typical
Input LED Forward Current: 15mA Maximum Trigger Current
Peak Forward Current: 1A
Reverse Voltage: 6V Maximum
Output Off-State Voltage: 400V Peak
Peak Output Current: 100mA
Trigger Mode: Random Phase (Non-Zero Crossing)
Zero-Cross Detection: No
Turn-On Time: Fast Response
Operating Temperature Range: -40°C to +100°C
Storage Temperature Range: -55°C to +150°C
Mounting Type: Through-Hole
Pin Count: 6

Additional Resources

MOC3021.PDF

FAQ

1. What is the MOC3021 used for?

The MOC3021 is used to safely control TRIACs and AC-powered loads while providing electrical isolation between control circuits and mains voltage.

2. What is the difference between the MOC3021 and zero-cross optocouplers?

The MOC3021 supports random-phase triggering, allowing phase-angle control for dimmers and motor speed controllers, whereas zero-cross optocouplers switch only near the AC zero-crossing point.

3. Can the MOC3021 be connected directly to an Arduino or ESP32?

Yes, the input LED can be driven from Arduino, ESP32, STM32, and other microcontrollers using an appropriate current-limiting resistor.

4. Does the MOC3021 directly drive AC loads?

No, the MOC3021 is designed to trigger an external TRIAC, which then switches the AC load.

5. What applications commonly use the MOC3021?

It is widely used in AC dimmers, fan regulators, heater controllers, solid-state relays, industrial automation systems, and smart home control devices.

View full product details

The MOC3021 is an optically isolated triac driver IC designed for controlling TRIACs and AC loads while providing complete electrical isolation between low-voltage control circuits and high-voltage AC power circuits. It integrates an infrared LED and a light-activated bilateral switch (phototriac) within a compact package, enabling safe and reliable switching of mains-powered devices.

Unlike zero-cross optocouplers, the MOC3021 features random-phase triggering, making it ideal for phase-angle control applications such as light dimmers, motor speed controllers, heater controllers, and AC power regulation systems.

The MOC3021 is widely used with microcontrollers such as Arduino, ESP32, STM32, and Raspberry Pi to safely interface low-voltage digital circuits with AC-powered equipment.

Key Features

  • Optically isolated TRIAC driver
  • Random-phase triggering capability
  • High isolation voltage
  • Built-in infrared LED input
  • Phototriac output stage
  • Suitable for AC load control
  • Low input current requirement
  • Excellent electrical isolation
  • High noise immunity
  • Compact DIP package
  • Easy interfacing with microcontrollers
  • Reliable and long operational life
  • Suitable for phase control applications
  • Ideal for industrial and home automation systems