PC817 Optocoupler Optoisolator SMD 4-Pin
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Prices updated: 12 Oct 2026
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About this product
The PC817 is a 4-pin optocoupler that transfers a signal from an LED input to a phototransistor output while keeping the two sides electrically isolated. It is rated for 5000Vrms isolation and is used to separate low-voltage microcontroller circuits from high-voltage circuits. It is commonly found in switching power supplies, feedback loops and interface isolation.
Specifications
- Input forward current
- 50 mA
- Peak forward current
- 1 A
- Reverse voltage (input)
- 6 V
- Collector-emitter voltage
- 35 V
- Collector current
- 50 mA
- Total power dissipation
- 200 mW
- Isolation voltage
- 5000 Vrms
Frequently asked questions
How do I drive the LED side?
Use a series resistor on the input LED to keep the forward current below the 50 mA maximum. Many designs use a lower current, such as 10 to 20 mA, for reliable switching.
Can it switch a mains load directly?
No. The output transistor only handles small currents (50 mA collector limit), so use it to drive a relay, a triac driver or a MOSFET on the load side.
