Skip to datasheet
Zero-cross optotriac driver

MOC3063 Working Principle

Learn how MOC3063 works with an illustrated explanation and practical readings.

Package view

MOC3063 at a glance

Follow the labeled connections and functional stages

MOC3063 working principle: illustrated functional stages, basic circuit and connections
Select the diagram to read it at full resolution.

How it works

3 stages · Explore one step at a time

Step 1 / 3

Drive the emitter

The buffered source and resistor set infrared LED current.

Step 2 / 3

Wait near the crossing

The optical detector permits triggering only inside the low-output-voltage window.

Step 3 / 3

Allow current commutation

The output remains conducting until current falls sufficiently; removing LED drive prevents later retriggering.

Component view