150 V Zener regulation in a DO-35 axial package
The 1N6028B is a 150 V Zener diode rated for 500 mW continuous power dissipation in a through-hole DO-35 (DO-204AH) axial package. The ±5% tolerance on the nominal voltage is the standard grade for general-purpose voltage reference and clamping applications where tighter binning is not required. Maximum impedance (Zzt) is 1.25 kOhms at the test current — this figure governs the change in Zener voltage with load current and should be factored into the regulation budget for circuits drawing variable current through the diode.
Temperature range and leakage profile
Reverse leakage at 114 V (76% of Vz) is specified at 100 nA maximum — this low standby current suits battery-powered or high-impedance bias networks where every nanoamp matters. Forward voltage drop is 1.1 V maximum at 200 mA forward current, a typical figure for a silicon Zener of this voltage class and useful if the diode is also used as a signal clamp or rectifier in the same assembly.
Microchip Technology lists the 1N6028B as Active (current production).