160 V Zener with tight ±1% tolerance
The 1N6029D is a 160 V Zener diode from Microchip Technology, specified with a ±1% tolerance on the nominal voltage — that means the regulation point stays between 158.4 V and 161.6 V across the operating range, which matters when you are clamping a bus rail or setting a reference in a high-voltage divider. Rated for 500 mW continuous power dissipation in the DO-35 axial package, the part can handle steady-state dissipation up to that limit as long as the ambient temperature stays within the -65°C to 175°C range. The wide temperature span suits it for environments like industrial control cabinets or outdoor telecom gear where the board sees thermal cycling.
Leakage and forward characteristics
Reverse leakage current is specified at 100 nA maximum when the applied reverse voltage is 122 V — that is 38 V below the nominal Zener voltage, so the diode stays essentially off until it reaches the breakdown region. The low leakage keeps standby power loss negligible in circuits that idle below the regulation threshold. Forward voltage is 1.1 V maximum at 200 mA forward current, which means the diode can also serve as a general-purpose rectifier in low-current paths where the 160 V reverse standoff is not needed.