The SMDJ8.0CA-AT is a TVS (transient voltage suppressor) diode manufactured by Yageo. It has a maximum power dissipation (Pd) of 500 mW and a maximum peak pulse power (Ppp) rating of 1.5 kW (KiloWatt). It also has a breakdown voltage (BV) of 8.0V, and a clamping voltage (VC) of 13.8V. It comes in the RoHS compliant SMC (super mini) package with a DO-214AB form factor, and is designed to protect sensitive circuits from electrostatic discharge (ESD) and other transients.