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PC817 Transistor Output Optocoupler DIP-4

SKU: 5XKVABLX30
The PC817 is a widely used transistor output optocoupler (optoisolator) designed to provide electrical isolation between input and output circuits while allowing signal transmission through infrared light. The device consists of an infrared LED optically coupled to a phototransistor, enabling safe signal transfer without direct electrical connection. Housed in a compact DIP-4 package, the PC817 helps protect sensitive microcontrollers, digital...
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Specifications

Specifications :

Device Type: Transistor Output Optocoupler
Model: PC817
Package Type: DIP-4
Number of Pins: 4
Isolation Method: Optical Isolation
Input Element: Infrared LED
Output Element: NPN Phototransistor
Forward LED Voltage: Typically 1.2V
Forward LED Current: 20mA Typical
Maximum Forward Current: 50mA
Collector-Emitter Voltage (VCEO): 80V Maximum
Collector Current: Up to 50mA
Isolation Voltage: 5000Vrms Typical
Current Transfer Ratio (CTR): 50% – 600% (depending on grade)
Rise Time: Typically 4µs
Fall Time: Typically 3µs
Power Dissipation: 200mW Maximum
Operating Temperature: -30°C to +100°C
Storage Temperature: -55°C to +125°C
Mounting Type: Through-Hole

Additional Resources

PC817.PDF

FAQ

1. What is the PC817 Optocoupler used for?

The PC817 is used for electrical isolation between two circuits while allowing signal transfer, helping protect low-voltage electronics from high voltages, noise, and voltage spikes.

2. How does the PC817 provide isolation?

The PC817 uses an internal infrared LED and phototransistor. The input signal drives the LED, and the emitted light activates the phototransistor, transferring the signal without a direct electrical connection.

3. What is the isolation voltage rating of the PC817?

The PC817 provides an isolation voltage of up to 5000Vrms, making it suitable for industrial and power supply applications.

4. Can the PC817 be used with Arduino and other microcontrollers?

Yes, the PC817 is widely used with Arduino, ESP32, STM32, Raspberry Pi, and other microcontrollers for signal isolation and interface protection.

5. What are the advantages of using a PC817 Optocoupler?

The PC817 offers electrical isolation, improved noise immunity, protection against voltage spikes, prevention of ground loops, and increased safety when interfacing different voltage domains.

View full product details

The PC817 is a widely used transistor output optocoupler (optoisolator) designed to provide electrical isolation between input and output circuits while allowing signal transmission through infrared light. The device consists of an infrared LED optically coupled to a phototransistor, enabling safe signal transfer without direct electrical connection.

Housed in a compact DIP-4 package, the PC817 helps protect sensitive microcontrollers, digital circuits, and communication interfaces from high voltages, electrical noise, voltage spikes, and ground loops. It is commonly used in industrial control systems, power supplies, microcontroller interfacing, PLC systems, and switching circuits.

The PC817 offers reliable isolation performance, low power consumption, and easy integration into both hobby and professional electronic designs, making it one of the most popular optocouplers available.

Key Features

  • Infrared LED and phototransistor optically coupled
  • Provides electrical isolation between input and output circuits
  • High isolation voltage capability
  • Compact DIP-4 package
  • Low power consumption
  • Fast switching response
  • Excellent noise immunity
  • Protects low-voltage circuits from high-voltage systems
  • Suitable for digital and analog signal isolation
  • Reliable and long operational life
  • Easy PCB mounting and integration
  • Widely used in industrial and embedded applications