This is a SMCJ75CA Thyristor Surge Suppressor Diode with a voltage of 121V, 83.3V, and 75V, manufactured by AnBon. It is a unidirectional device, encapsulated in a SMC (DO-214AB) package. This device is designed to protect sensitive components from transients caused by electrostatic discharge (ESD), electrical fast transients (EFT), and lightning. It is ROHS compliant and can be used to suppress over-voltage transients in automotive, consumer, industrial, and telecom applications.