Pinout
PC817 optocoupler (DIP-4) pinout
Pins
- 1 Anode (LED +, dot corner — needs a series resistor)
- 2 Cathode (LED −)
- 3 Emitter (transistor)
- 4 Collector
- Input and output sides are galvanically isolated (5kV)
Specifications
| Isolation voltage | 5000 V rms |
|---|---|
| LED forward voltage | ≈ 1.2 V typ, 1.4 V max at 20 mA |
| LED forward current | 50 mA max; typically driven at 5–10 mA |
| LED reverse voltage | 6 V max |
| Current transfer ratio | 50–600% at 5 mA (ranks A–D narrow it, e.g. B: 130–260%) |
| Collector–emitter voltage | 35 V max |
| Collector current | 50 mA max |
| Switching time | ≈ 4 µs rise, 3 µs fall (typ) |
| Operating temperature | −30–100 °C |
| Package | DIP-4 (SMD versions available) |
