The Vishay BZG03C36-M3-08 is a 36 V Zener diode from the BZG03C-M series, rated for 1.25 W continuous power dissipation in the DO-214AC (SMA) surface-mount package. The 36 V nominal voltage (Vz) with ±5.56% tolerance puts the regulation window between roughly 34 V and 38 V — tight enough for secondary-side post-regulator clamping or overvoltage protection on a 24 V rail that sees transients.
1.25 W in an SMA — thermal budget check
At 1.25 W max, the DO-214AC body relies on the PCB copper pad for heat spreading. At 36 V the worst-case steady-state current is about 35 mA before hitting the power ceiling. The 40 Ohm maximum zener impedance (Zzt) means the regulation stiffens at higher bias currents — below a few mA the slope resistance adds voltage uncertainty to the clamp point. Reverse leakage is specified at 1 µA max at 27 V, so the diode draws negligible quiescent current below the breakdown knee. Forward voltage drop is 1.2 V max at 500 mA.
For a 36 V Zener in a standard SMA footprint, this part is a straightforward line-item fill — no date-code vetting or broker screening needed.