The ES1J with Diodes - Rectifiers - Hyperfast SMA RoHS is a power switching diode made by TWGMC and is designed for use in high frequency applications. It features an extremely low forward voltage drop, and has a reverse recovery time of less than 4 nanoseconds. This part is also RoHS compliant, meaning that it does not contain hazardous substances such as lead or mercury. It is designed to offer high frequency switching performance in a variety of application environments, including HVAC, power supplies, general purpose switching, and more.