The SMCJ51A-AT with TVS SMC(DO-214AB) RoHS is an electronic part manufactured by Yageo. It is a surface mount Transient Voltage Suppressor Diode, featuring a peak pulse power rating of 1500 watts and a breakdown voltage of 5.1 volts. This component provides advanced protection against high-energy, ESD (electrostatic discharge) and transients, making it ideal for applications such as telecom and datacom equipment, consumer electronics, automotive, and LED lighting. It also meets RoHS (Restriction of Hazardous Substances Directive) requirements, meaning it is free from lead, mercury, cadmium, and other toxic substances. The component is housed in a DO-214AB package, making it suitable for hand and automatic soldering.