The IS281K Optoisolator - Transistor, Photovoltaic Output from Isocom Components 2004 LTD is a 4-pin surface-mount (SMD) device providing electrical isolation between input and output circuits, while maintaining a direct current path between them. This device is perfect for use in applications where a circuit needs to be electrically isolated while still sending information to other circuits, such as in isolated power supplies, isolated analog, TTL, and digital signal transmission. The IS281K is designed to work over a wide temperature range from -40°C to +105°C, and is capable of withstanding up to 1500 Volts, making it suitable for use in a variety of environments with varying power and temperature levels. This optocoupler is a solid choice for projects requiring electrical isolation across circuits and efficient signal transmission, providing high reliability and durability.