The SMBJ190A is an unidirectional transient voltage suppressor diode manufactured by Yageo. It is designed to provide surge protection and reduce voltage transients on the power line. This diode has a maximum blocking voltage of 308V, a breakdown voltage of 211V, and a clamping voltage of 190V, all of which are measured at a temperature of 25°C. This diode is also RoHS compliant and is encapsulated in a DO-214AA SMB package.