200 V zener, 500 mW, DO-35 axial
The 1N6031D is a 200 V zener diode from Microchip Technology, rated for 500 mW continuous power dissipation in a DO-35 axial-lead package. With a ±1% tolerance on the nominal voltage, this part suits precision voltage-reference or clamping applications where the setpoint must stay tight across the operating range.
Leakage and impedance at the test point
Reverse leakage is specified at 100 nA maximum when the applied voltage is 152 V — 76% of the nominal zener voltage — so the diode stays well below its breakdown knee in the blocking state. Maximum zener impedance (Zzt) is 2 kOhms at the test current, a figure that governs the regulation slope: a 1 mA change in bias current shifts the output voltage by up to 2 V.
The junction operates from -65°C to 175°C, covering military-temperature applications — avionics, downhole instrumentation, or satellite power rails where the ambient floor is well below -40°C. Housed in a DO-35 (DO-204AH) axial-lead glass package, it mounts through-hole on a PCB or terminal strip; the glass body is hermetic and resists moisture ingress better than molded epoxy in high-humidity storage.