100 V clamp or shunt — the DO-214AC power ceiling
The BZG03C100-M3-08 is a 100 V zener diode from Vishay's BZG03C-M series, rated for 1.25 W maximum power dissipation in the DO-214AC (SMA) surface-mount package. The ±6% tolerance on the nominal zener voltage means the actual clamp point falls between 94 V and 106 V — a standard-grade window that suits overvoltage clamping and rail-to-rail shunt regulation in DC bus or telecom line-side circuits.
Leakage and forward drop — bias and rectification margins
Reverse leakage is specified at 1 µA maximum at 75 V reverse voltage, confirming the diode stays well below avalanche conduction at that bias point — relevant when the zener sits across a high-impedance reference input. Forward voltage is 1.2 V maximum at 500 mA, typical for a 1.25 W-rated silicon junction in an SMA body.