The OSRYMC5B31A-12V is an optocoupler manufactured by Optosupply. It is a single channel, high-speed, fast–propagation, single–transistor output optocoupler. The device features a P-Channel MOSFET output, constant current LED driver, and an internal 5K ohm resistor that provides protection against voltage transients and fast edge rates. It is ideal for use in applications requiring a switching speed of up to 100 kHz and output peak current up to 500mA. The device has a wide operating temperature range of -40°C to 105°C, making it suitable for a variety of industrial, medical, and consumer applications.