The ES5GC diode with Hyperfast (400V 5A 1.25V @ 5A 35ns SMC) is a 400 V, 5 A, 1.25 V, 5 A, 35 ns Surface Mount Diode manufactured by Jingdao and is compliant with RoHS standards. It is a type of rectifier, which is an electronic component used to convert alternating current into direct current. It can be used to regulate voltage, protect circuits from reverse current flow, and create a voltage drop between two points in an electrical circuit. The ES5GC comes in an SMC type package, specifically DO-214AB, which is a miniaturized package designed for surface mounting.