PC817 Optocoupler – DIP-4 | Opto-Isolator IC

The PC817 Optocoupler is a 4-pin DIP (Dual Inline Package) opto-isolator IC that contains a gallium arsenide infrared LED and a silicon phototransistor. It is widely used for electrical isolation between input and output circuits, offering protection and signal integrity in noisy or high-voltage environments.

Whether you’re designing power supplies, microcontroller interfaces, or digital circuits requiring isolation, the PC817 is a cost-effective, reliable, and compact solution ideal for both industrial and DIY applications.

 Features

• Internal IR LED and phototransistor combination
• Excellent isolation between input and output
• Compact DIP-4 package
• High collector-emitter voltage: up to 80V
• High isolation voltage: 5000 Vrms (minimum)
• Low input current requirements
• Reliable performance in industrial conditions

 Technical Specifications

• Input LED Forward Voltage – 1.2V (typical)
• Input LED Forward Current – 20mA (typical)
• Output Collector – Emitter Voltage – 80V (maximum)
• Isolation Voltage – 5000 Vrms (1 minute)
• Current Transfer Ratio (CTR) – 50% to 600% (depending on model)
• Response Time  – 4 µs (typical)
• Operating Temperature  – 30°C to +100°C
• Package Type – DIP-4

 Applications

Microcontroller Interfacing –
Isolate microcontrollers from high-voltage components in circuits.

Switching Power Supplies –
Ensure feedback and signal control with safety.

Signal Isolation –
Use in industrial automation and data transmission for noise immunity.

Zero-Crossing Detectors –
Detect AC line zero-crossing to control switching circuits.

Home Appliances and Consumer Electronics –
Isolate logic and power sides effectively.

 Package Includes

1 x PC817 Optocoupler – DIP-4 IC