33 V regulation in a DO-35 axial package
The 1N6012A is a 33 V Zener diode from Microchip Technology, rated for 500 mW continuous power dissipation in the DO-35 axial-lead package. The 33 V nominal breakdown voltage suits it for voltage reference, shunt regulation, or clamping in low-power rails up to about 15 mA continuous Zener current.
Tolerance and leakage — what they mean for the BOM
±10% tolerance on Vz means a 33 V part can regulate anywhere from 29.7 V to 36.3 V at the specified test current. For a precision reference, a tighter-tolerance Zener or a TL431 shunt is needed; for general-purpose rail clamping or overvoltage crowbar, this spread is acceptable. Reverse leakage is 100 nA maximum at 21 V reverse bias — two-thirds of the nominal breakdown voltage. In battery-powered circuits, that leakage is negligible; a 100 nA draw at 21 V represents about 2.1 µW standby loss. Maximum forward voltage is 1.1 V at 200 mA forward current, which matters if the diode is used as a low-speed rectifier or flyback clamp in the forward direction.
For a new design or a BOM fill, this part is available through franchised and independent distribution channels.