The SMCJ51A with 82.4V 56.7V 51V SMC (DO-214AB) TVS ROHS is an electronic part manufactured by Yageo. It is a unidirectional surface mount transient voltage suppressor that limits voltage spikes and transient currents caused by electrostatic discharge (ESD), lightning, and other forms of electrical surge up to an operational voltage of 51 V. This device can withstand such voltages and offer excellent clamping capability, with fast response times. It is housed in a DO-214AB package and is RoHS compliant, making it an environmentally-friendly option.