The SMBJ120CA from Littelfuse is a surface-mount Uni-Directional Transient Voltage Suppressor (TVS) designed to protect sensitive electronic components from high-voltage, high-energy transients caused by electrostatic discharge (ESD), cable discharge events (CDE), and lightning strikes. This device is capable of handling high energy transients up to 600W peak pulse power withstanding voltages up to 400 volts. It features a low clamping voltage, fast response time, and a RoHS-compliant, lead-free construction.