The UDZ3.9B-H Zener diode, manufactured by Formosa Microsemi, is a crucial component for voltage regulation and protection in electronic circuits. This 3.9V, 500mW Zener diode is housed in a space-saving SOD-323 package, making it suitable for high-density PCB designs. It provides a stable reference voltage and is commonly used in voltage regulators, overvoltage protection circuits, and clipping circuits. Supreme Components International is an authorised distributor of Formosa Microsemi components, ensuring that you receive a genuine and high-quality product. The UDZ3.9B-H offers excellent performance characteristics and is designed to withstand transient voltage surges, enhancing the reliability of your electronic devices. Its compact size and robust design make it a versatile choice for a wide range of applications.