HCPL-4502 PDF Datasheet – Optocoupler, Transistor, 8 Pin

Part Number: HCPL-4502

Function: High Speed Transistor, Optocoupler

Package: DIP 8 Pin Type

Manufacturer: QT Optoelectronics,  Fairchild Semiconductor


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HCPL-4502 pdf pinout


The HCPL-4502, HCPL-2503, 6N135, 6N136 and HCPL-2530, HCPL-2531 optocouplers consist of an AlGaAs LED optically coupled to a high speed photodetector transistor.

A photocoupler, also known as an optocoupler or an optical isolator, is an electronic component that provides electrical isolation between two circuits while allowing them to communicate with each other optically. It typically consists of an LED and a photodetector, such as a photodiode or a phototransistor, housed in a single package.

The LED transmits an optical signal to the photodetector, which converts it into an electrical signal that can be used to trigger or switch another circuit.

A separate connection for the bias of the photodiode improves the speed by several orders of magnitude over conventional phototransistor optocouplers by reducing the base-collector capacitance of the input transistor.

An internal noise shield provides superior common mode rejection of 10kV/µs. An improved package allows superior insulation permitting a 480 V working voltage compared to industry standard 0f 220 V.


1. High speed-1 MBit/s

2. Superior CMR-10 kV/µs

3. Double working voltage-480V RMS

4. CTR guaranteed 0-70°C


HCPL-4502 datasheet



1. Line receivers

2. Pulse transformer replacement

3. Output interface to CMOS-LSTTL-TTL

4. Wide bandwidth analog coupling

HCPL-4502 PDF Datasheet

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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