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Random-phase optotriac driver

MOC3021 Basic Circuit

Build a basic MOC3021 circuit with labeled pins, component values and connection guidance.

Package view

MOC3021 in a circuit

Physical six-pin package with both no-connect leads marked.

MOC30215VAthrough220ohmtoLED1,2GNDA,3and5open;6through2.2kohmto12VACisolatedsource,4ACreturn.
Isolated low-voltage demonstration; a practical mains load needs an independently engineered power stage.

Connect it, step by step

Follow the component values and pin connections

Set input current

Use 220 Ω from the buffered 5 V source to pin 1.

Keep returns separate

Input cathode goes only to GND_A; the AC source stays isolated.

Observe output

A 2.2 kΩ resistor limits the output current to a few milliamps.

Component view