The BZX55C4V3 is a Zener Diode with a DO-35 (through-hole) package and manufactured by Semtech. It functions as a voltage regulator, allowing a circuit to remain stable over fluctuating input voltage. The RoHS (Restriction of Hazardous Substances) compliance indicates that the device does not contain any of the regulated hazardous substances, such as lead, cadmium, hexavalent chromium, and more. It has a maximum power dissipation of 500mW, a maximum operating temperature of 150°C, and a peak reverse current of 1mA. The BZX55C4V3 Diode is a small, robust, reliable and efficient component ideal for use in various electronic circuits.