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Home/Voltage & Current Tools/Zener Diode Resistor

Free Zener Diode Resistor

Calculate the required series resistor for a Zener diode voltage regulator. Protects your diode while maintaining a stable output voltage under load.

Configuration

Input Volts

Zener Volts

Load mA

How to Use

Enter the Supply Voltage (Vin).
Enter the Zener Diode Voltage (Vz).
Input the current required by the load (in mA).
The result gives the resistor value needed to limit current and protect the diode.

Common Use Cases

Voltage Regulation

Frequently Asked Questions

Why do I need a resistor with a Zener diode?

The resistor limits the current flowing through the diode. Without it, the Zener diode would draw excessive current and burn out.

What wattage resistor should I use?

Calculate power (P = I²R) for the resistor. It's safe practice to choose a resistor rated for at least 2x the calculated power.

Pro Tip

Calculates R to protect Zener.

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Free Zener Diode Resistor - Online Tools | ConfigGen