The MOC3021 Series consists of gallium arsenide infrared emitting diodes, optically coupled to a silicon bilateral switch. To order devices that are tested and marked per VDE 0884 requirements, the suffix ”V” must be included at end of part number. VDE 0884 is a test option. They are designed for applications requiring isolated triac triggering.

Part Number: MOC3021

Function: RANDOM-PHASE OPTOISOLATORS TRIAC DRIVER OUTPUT (400 VOLT PEAK)

Package: DIP 6 Pin

Manufacturer: Fairchild Semiconductor

Fairchild Semiconductor Corporation, a semiconductor manufacturing company, was acquired by ON Semiconductor Corporation on September 18, 2016.

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Description

This is an optocoupler that consists of an LED and a photo-triac device. It is designed for use in isolation applications to control AC loads using DC signals. It has a high isolation voltage and low coupling capacitance, which makes it suitable for use in high voltage and noise-sensitive environments.

Pinout:

Features

1. Optocoupler with an LED and a photo-triac device

2. Designed for use in isolation applications to control AC loads using DC signals

3. High isolation voltage and low coupling capacitance

4. Available in a 6-pin DIP and SMD packages

5. Provides isolation between input and output circuits, which enhances safety and reduces noise interference

6. Can control AC loads using low voltage DC signals, which simplifies circuit design

7. Low coupling capacitance reduces the risk of false triggering

8. Easy to use and widely available

Recommended for 115/240 Vac(rms) Applications:

1. Solenoid/Valve Controls
2. Static ac Power Switch
3. Lamp Ballasts
4. Solid State Relays
5. Interfacing Microprocessors to 115 Vac Peripherals
6. Incandescent Lamp Dimmers
7. Motor Controls

Q/A 1.

How does this IC is provide isolation between input and output circuits?

This IC uses an optocoupler design, which consists of an LED and a photo-triac device. The LED is driven by a low voltage DC signal, and when it turns on, it activates the photo-triac, which in turn switches on an AC load. The input and output circuits are physically separated by the optocoupler, which provides electrical isolation between them.

MOC3021 Datasheet PDF Download

Other data sheets are available within the file: MOC3021-M, MOC3022, MOC3023, MOC3023-M