The EL817S1(A)(TU) is an Optocoupler type Light Sensor manufactured by Everlight. It is a four channel optocoupler, consisting of four dual-channel light-receiving optocouplers that can be used to connect electronic circuits between two isolation points. It is a Thin-SOP and UL recognized component that meets IEC, EN, and UL requirements for ESD immunity. It is RoHS compliant, features a low stand-off ratio of 120kV/µs, and has a minimum insulation distance of 4.5mm. The EL817S1(A)(TU) is ideal for use in controlling, monitoring, and measuring processes for a variety of applications, including security, industrial, and transportation systems.