⚙️Product Description

The PC817 Optocoupler (also known as an optoisolator) is an electronic component that transfers electrical signals between two isolated circuits using light. Inside the IC, an infrared LED and a phototransistor work together to pass the signal without direct electrical connection.

This isolation protects sensitive microcontrollers and low-voltage circuits from high-voltage spikes, electrical noise, and accidental damage. The PC817 is commonly used in Arduino circuits, relay boards, switching power supplies, inverter boards, industrial control systems, and communication interfaces.

Its compact 4-pin package, low cost, and reliable operation make it one of the most popular optocouplers for electronics projects and repairs.

⚙️ Specifications

• Component Type: Optocoupler / Optoisolator
• Model: PC817
• Package Type: DIP-4 Through-Hole
• Number of Pins: 4
• Isolation Voltage: Up to 5,000V RMS
• Input Type: Infrared LED
• Output Type: Phototransistor
• Forward Voltage: 1.2V typical
• Forward Current: 20mA typical
• Collector-Emitter Voltage: 80V max
• Operating Temperature: -30°C to +100°C

⚙️ Weight

• Approximate Weight: 0.3 g per PC817

⚙️ Key Features

• Provides electrical isolation between input and output circuits
• Protects microcontrollers and sensitive electronics from high voltage
• Compact 4-pin DIP package for easy PCB mounting
• High isolation voltage up to 5kV
• Low power consumption and reliable performance
• Fast switching and stable signal transfer
• Ideal for use with Arduino, ESP32, Raspberry Pi, PLCs, and relay modules
• Commonly used in power supply feedback and signal isolation circuits

⚙️ Applications

• Arduino and microcontroller projects
• Relay module isolation circuits
• Switching power supplies
• PLC and industrial control systems
• Inverter and motor controller circuits
• AC mains sensing circuits
• Signal isolation between high and low voltage sections
• Communication interface protection
• DIY electronics and PCB projects

⚙️ Pin Configuration

1. Anode (Input LED +)
2. Cathode (Input LED –)
3. Emitter (Output Transistor)
4. Collector (Output Transistor)

⚙️ Package Includes

• 1 × PC817 Optocoupler IC

Note: The PC817 is polarized and must be connected correctly according to the pin layout. Always use an appropriate resistor with the input LED to prevent damage.