The BZX84C4V3CC is a single, 4V~4.6V, 350mW, 4.3V, TO-236 Zener diode, manufactured by Semtech and RoHS compliant. It is designed to regulate the voltage of a given circuit. It also serves to protect sensitive components by diverting excess voltage away from the circuit. This diode emits a uniform voltage, regardless of increases in current, allowing it to be used in a variety of applications, including reverse voltage protection, voltage regulation, and voltage reference.