Zener Resistor Calculator

How Zener Resistor works

For Zener Resistor, use R = voltage difference ÷ current. Zener Resistor uses Supply minus Zener voltage, Zener branch current to report Series resistor. Diode loss belongs in the separate Diode Power Dissipation worksheet.

With the loaded values, series resistor evaluates to 350.00 Ω. Test supply minus zener voltage separately and preserve the baseline series resistor.

Inputs for Zener Resistor

Supply minus Zener voltage and Zener branch current belong to Zener Resistor. Keep source units with supply minus zener voltage.

The Zener Resistor defaults demonstrate arithmetic only. Replace supply minus zener voltage with case-specific data. Use RC Snubber Calculator to a separate snubber time constant calculation.

Supply minus Zener voltage

Example entry: 7 V.

Zener branch current

Example entry: 0.02 A.

Reading the Zener Resistor result

This output represents Zener Resistor.

Before selecting equipment for Zener Resistor, compare series resistor with available ratings and operating limits. For equivalent capacitance, use Parallel Capacitor Calculator.

Measurement and units

Use component tolerances, voltage ratings, current limits, frequency behavior, and thermal data from the selected parts. Check prefixes on supply minus zener voltage. LEDs per string can be checked in LED Series String Calculator.

Keep the supply minus zener voltage unit and measurement point consistent across Zener Resistor cases.

Limits of this calculation

Check Zener power at minimum and maximum load.

Only the listed Zener Resistor inputs contribute to series resistor. Unentered effects remain outside Zener Resistor.