The BZT55C3V9-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 is designed to maintain a stable voltage output under varying current conditions. Housed in a compact SOD-80 package, it's suitable for space-constrained applications. Supreme Components International is an authorized distributor of Formosa Microsemi components, ensuring that you receive genuine, high-quality products. This Zener diode is commonly used in power supplies, voltage references, and overvoltage protection circuits. Its robust design and precise voltage characteristics make it a reliable choice for demanding applications. Trust Supreme Components International for all your electronic component needs.