Zener Voltage Regulator Calculator

Zener voltage regulator calculator allows you to quickly determine the series resistor value of a Zener diode. The total current of the circuit is determined by the series resistor (R1) and is always constant. When the load current decreases, the current through the Zener diode increases accordingly. This calculator assumes a constant load current.

To calculate the series resistor (R1) value just enter the input voltage (Vin), Zener voltage (VZ), maximum load current (IL) and minimum reverse current (IZ). To determine the Zener voltage and minimum reverse current of a particular Zener diode please refer to manufacturer specifications.

This tool also displays recommended resistor wattage as well as resistor color coding and SMD resistor code.


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