3.9V 1Watt Zener Diode 1N4730A

The 1N4730A is a 3.9V, 1W silicon planar Zener diode manufactured by onsemi, engineered for precise low-voltage stabilization and transient clipping circuits. Housed in a hermetically sealed, axial-leaded DO-41 glass package, this component features a standard 5% voltage tolerance and an operating temperature range spanning from -65°C to +200°C. According to the 1N47 Series Zener Diodes.pdf datasheet, it operates at a nominal Zener voltage of 3.9V under a 64 mA test current while maintaining a maximum dynamic impedance of 9 $\Omega$. This design delivers sharp reverse breakdown and long-term reliability for reference voltage tuning in power management systems.