The UDZ3.9B-FL-H Zener diode, manufactured by FORMOSA MICROSEMI, is a crucial component for voltage regulation and circuit protection. With a Zener voltage of 3.9V and a power dissipation of 500mW, this diode provides a stable reference voltage in a variety of electronic applications. Housed in a SOD-523 package, it offers a compact footprint for space-saving designs. Supreme Components International is an authorised distributor of FORMOSA MICROSEMI components, ensuring that you receive a genuine and high-quality product. This Zener diode is commonly used in voltage stabilization, overvoltage protection, and clipping circuits. Its reliable performance and small size make it a versatile choice for both professional and hobbyist electronics projects. Trust Supreme Components International for all your electronic component needs.