MOC7811 PDF Datasheet – Optocoupler

This post explains for the Optocoupler.

The Part Number is MOC7811, M0C7811.

The function of this semiconductor is Optocoupler / Couplers, Interrupters.

Manufacturer: Motorola

Preview images :

MOC7811 PDF slotted coupler


MOC7811 is Optocoupler. An optocoupler, also known as an optoisolator or photocoupler, is an electronic device that combines an optical transmitter (typically an LED) and an optical receiver (usually a phototransistor or photodiode) in a single package. It is designed to provide electrical isolation between input and output circuits.

The optocoupler functions by using light to transmit signals between the input and output sides of the device while maintaining electrical isolation. When an input signal is applied to the LED, it emits light. The light is then detected by the phototransistor or photodiode on the output side, which generates a corresponding electrical signal.

Slotted couplers consist of an infrared emitting diode facing a photodetector in a molded plastic housing. A slot in the housing between the emitter and the detector provides a means of interrupting the signal. A wide selection of standard and custom housings and detector fuctions is available.



1. Cathode
2. Collector
3. Anode
4. Emitter

MOC7811 pinout datasheet


1. Signal isolation in digital and analog circuits.

2. Feedback control systems.

3. Switching power supplies.

4. Motor control and drive circuits.

5. Communication interfaces and protocols.

6. AC line voltage monitoring and protection circuits.


Other data sheets are available within the file: MOC7812, MOC7813 MOC7821, MOC7822, MOC7823

MOC7811 PDF Datasheet

MOC3021 Datasheet – Optoisolator Triac Driver – Fairchild

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


Package: DIP 6 Pin

Manufacturer: Fairchild Semiconductor

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


MOC3021 Optocoupler


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.



MOC3021 datasheet


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

MOC3021 pdf


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