.The SMBJ180CA is a transient voltage suppressor diode, manufactured by Yageo, that is packaged in the DO-214AA size with the Surface Mounted Box (SMB) option. It is RoHS-compliant and can protect against electrical spikes of up to 292 volts, 201 volts, and 180 volts. This component is typically used for protecting sensitive circuits against high voltage spikes, which can occur due to external sources such as lightning.