The SMBJ75CA is a Bi-Directional TVS (Transient Voltage Suppressor) manufactured by Yenji. It has a bidirectional capability, meaning it can protect AC or DC circuits from both positive and negative voltage spikes. It is RoHS (Restriction of Hazardous Substances) compliant, meaning it is free of any hazardous materials defined in the European Union Directive 2002/95/EC, such as lead, mercury, cadmium, hexavalent chromium, and polybrominated biphenyls (PBBs). The SMBJ75CA has a maximum surge current of 5A, maximum peak pulse power of 121V, and it can withstand up to 83.3V in one direction and 75V in the other. It is packaged in a DO-214AA (SMB) package, which is a very small, rectangular 2-pin package with a transparent, epoxy plastic covering.