The SMBJ20A is a unidirectional Transient Voltage Suppressor (TVS) with SMB (DO-214AA) package. It is manufactured by Taiwan Semiconductor / TWGMC, a leading manufacturer of integrated circuits. The SMBJ20A is designed to protect electronic circuits from voltage spikes. It can absorb up to 20 amps of surge current with an operating voltage range of 5.5 to 171 volts. It is RoHS compliant, meaning that it does not contain hazardous materials such as lead and mercury. The device is designed with a low forward voltage drop and reverse leakage current.