The US3M is a High Effic Rectifier manufactured by YFSEMI that meets ROHS standards. It features a Junction Temperature ranging from -55 degrees Celsius to 150 degrees Celsius, a 3 Amp rating at 1kV AC, a 5 microamp rating at 1kV DC, a 1.7V rating at 3 Amps, and a 75 nanosecond rate of recovery. It comes in the SMB (DO-214AA) package.