The PC817 Opto Coupler is used to isolate the low voltage from the high voltage in a circuit.

Quick Spec

• Input Forward Current: 50mA
• Peak Forward Current: 1A
• Reverse Voltage: 6V
• Collector-Emitter Voltage: 35V
  
• Emitter-Collector Voltage: 6V
• Collector Current: 50mA
• Collector Power Dissipation: 150mW
• Total Power Dissipation: 200mW
• Isolation Voltage: 5000Vrms

Resources

• Datasheet