PC817

The PC817 is a single-channel optocoupler that combines an infrared LED and a phototransistor in a 4-pin package. When current flows through the LED, the phototransistor switches on, passing a signal between two circuits that have no electrical connection. It is used to isolate microcontrollers from mains, motor and other high-voltage or noisy circuits.

PC817 Optocoupler Specifications

• Type: phototransistor optocoupler, 1 channel
• Pins: 4 (1 = anode, 2 = cathode, 3 = emitter, 4 = collector)
• Isolation voltage: 5000 V rms
• LED forward voltage: 1.2 V typical, 1.4 V max at 20 mA
• LED forward current: 50 mA max
• Collector-emitter voltage: 35 V max
• Collector current: 50 mA max
• Current transfer ratio: 50–600 % at 5 mA

PC817 Optocoupler Applications

• Isolating Arduino or ESP32 inputs from 12 V and 24 V signals
• Interfacing circuits that use separate grounds
• Noise isolation for motor and relay control
• Feedback loops in switching power supplies
• Electronics education and prototyping

What's in the Box

• 1 × PC817 optocoupler

Tip: Always drive the LED side through a series resistor: about 330 Ω from a 5 V pin gives roughly 10 mA. On the output side, connect a pull-up resistor such as 10 kΩ from the collector to your logic supply and read the signal at the collector.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.