The 1N4733AG is a 5.1 V zener diode rated for 1 W continuous power dissipation in a DO-41 axial-lead package. The 5.1 V nominal voltage with ±5% tolerance means the regulation point sits between 4.845 V and 5.355 V — a window tight enough for most 5 V rail clamping or reference applications. At 1 W, the maximum steady-state current through the zener is roughly 196 mA (1 W / 5.1 V), but the 7 Ohm max impedance (Zzt) means the voltage will shift about 7 mV per mA of load change — a factor to budget if the shunt current varies widely.
Temperature range and leakage — suitability for harsh environments
The -65°C to +175°C operating range covers military, automotive under-hood, and downhole tooling without derating the junction temperature. Reverse leakage is 10 µA max at 1 V reverse — low enough that it won't upset a high-impedance bias node at room temperature, though leakage doubles roughly every 10°C above 25°C. Forward voltage is 1.2 V max at 200 mA — if the zener is used as a bidirectional clamp, the forward drop adds to the clamping threshold on the negative swing.