PC817 is a commonly used DIP-4 (Dual In-line Package with 4 pins) optocoupler. It is a versatile optocoupler (also known as an opto-isolator) that is often used to provide electrical isolation between different sections of a circuit, such as between a low-voltage logic circuit and a high-voltage power circuit.
Input Diode Forward Voltage: 1.25V
Collector-Emitter Voltage: 80V (max)
Collector Current: 50mA (max)
Cut-off frequency: 80 kHz
Rise Time: 18us
Fall Time: 18us
Available as 4-pin DIP through hole and also as SMT package.