The OSC44L5111A is a light-activated switch or optocoupler module manufactured by Optosupply. The device contains a phototransistor, a photodiode, and a light source in a single package. It is designed to convert a light beam into a current to switch electrical circuits. Features include low power consumption, wide power supply range, long service life, built-in electronics, and high isolation voltage. The OSC44L5111A is suitable for low-level logic, motor control, and consumer electronics applications.