Active production — 20 V zener, 500 mW, DO-35
The 1N6007A is an active-production zener diode from Microchip Technology, rated 20 V nominal at ±10% tolerance with 500 mW maximum power dissipation. Housed in a DO-204AH (DO-35) axial-lead package, it supports through-hole mounting and operates across -65°C to 175°C — a temperature range that covers most industrial and military-grade environments without derating concerns.
Leakage and impedance — the off-state and regulation story
Reverse leakage is specified at 100 nA maximum when biased at 12 V — a low enough figure that the diode won't load down a high-impedance bias string in standby circuits. Maximum zener impedance (Zzt) is 62 Ohms, which sets the dynamic regulation floor: under a 5 mA change in operating current, the zener voltage shifts by roughly 310 mV worst-case, so the part is best suited for reference or clamping duties where the load current is stable.
Forward conduction — the other side of the junction
Forward voltage is 1.1 V maximum at 200 mA forward current — a typical figure for a 20 V zener junction, meaning the diode conducts with about 220 mW of forward loss at that current, well within the 500 mW package limit.