22 V Zener with ±1% tolerance — DO-35 axial
The 1N6008D is a 22 V Zener diode from Microchip Technology, specified with a tight ±1% tolerance that holds the regulation band to 220 mV — useful for generating a stable reference rail or clamping a signal line to a known voltage without extra trimming. Rated for 500 mW continuous power dissipation in free air, it handles typical bias and clamping loads in low-power circuits; derate above 25°C ambient per the standard Zener derating curve. The DO-35 axial package (DO-204AH) is through-hole, hand-solderable, and breadboard-friendly — no special reflow profile needed, and it mates with standard 0.100-inch pitch prototyping boards.
Reverse leakage and forward drop
Reverse leakage is 100 nA maximum at 17 V reverse voltage — low enough that it won't load a high-impedance bias network or a battery-powered sleep rail. Forward voltage is 1.1 V maximum at 200 mA forward current; the diode conducts symmetrically in the forward direction if used as a low-current rectifier or clamping element. Maximum Zener impedance (Zzt) is 55 Ohms at the test current — this sets the dynamic resistance that modulates the output voltage with load current; for a 1 mA change, the voltage shifts about 55 mV.