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MOC3022 Optoisolator Triac 6 pins

🔁 MOC3022 Optoisolator – Triac Driver Output (DIP-6)

Overview

The MOC3021 is a 6-pin DIP optoisolator with triac driver output, designed to provide safe and reliable electrical isolation between low-voltage control circuits (e.g., Arduino, ESP32) and high-voltage AC loads. It uses an infrared LED as the input and a triac-like output device capable of triggering an external triac, commonly used in AC switching applications like dimmers, motors, and lighting.

Key Features

  • Isolation between input and output (up to ~5000 Vrms)

  • Activates an external triac to switch AC loads

  • Random-phase output—can be used for non-zero-cross triggering

  • Compact DIP-6 package; pins spaced for standard PCBs

  • Low input LED current—use with a current-limiting resistor

  • Suitable for use up to 400 V peak AC on the output side

Arduino & AC Load Wiring Example

  1. Connect anode (pin 1) to an Arduino output pin through a ~330 Ω resistor.

  2. Cathode (pin 2) goes to Arduino GND.

  3. MT1 and MT2 connect to the gate and terminal of an external triac (e.g., BTA16) in series with the AC load.

  4. Use a zero-cross detector (optional) for smoother dimming.

  5. Ensure a snubber network or snubber-cap across the triac to suppress voltage spikes.

  6. Power the Arduino from a separate low-voltage supply, keeping control and AC sides isolated.

Applications

  • AC lamp dimmers and fan speed controllers

  • Solid state relays and automated lighting

  • Motor control via microcontrollers

  • Any AC-load switching requiring isolation and safe interfacing

✅ Resources


  1. đŸŽ„ YouTube Tutorial: https://www.youtube.com/watch?v=aUMKBWk7C_Q&list=PL4FdPemxE1U4vN9c4VQh3ujcr8YVQ9iF4

20.00 LE 20.00 LE

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Triac Transistor