The PS2801-4 is an optocoupler manufactured by Isocom, designed to provide an electrical isolation barrier between two components. It is supplied in an SOP-16 package and is compliant with RoHS (Restriction of Hazardous Substances) regulations. The optocoupler contains an LED and a photoreceiver, and both are optically coupled to provide electrical isolation. The device has a voltage rating of 5.0V and an isolation voltage of 2500V, allowing it to be used in high-voltage applications. It features a fast response time of 4ms, making it suitable for use in switching applications. The optocoupler has a low input current of 5mA, making it more energy-efficient than other optocouplers. Additionally, it has a high insulation resistance of 500 MO, making it reliable and stable even through high-voltage environments.