Zener Diode Calculator

Determine the power dissipation in a zener diode and the connected resistor by entering the load current, input voltage, and output voltage.

Use this online calculator to calculate the power dissipation in a zener diode and the resistor connected in series with it. A Zener diode is a special type of diode that allows current to flow in both forward and reverse directions once it reaches the zener voltage. It is heavily doped with a PN junction, enabling it to maintain a constant voltage even with significant changes in current flow. Simply input the values of the load current, input voltage, and output voltage into this calculator to determine the power dissipation in the resistor and the zener diode.

Maximum Input Voltage
Volts
Minimum Input Voltage
Volts
Output Voltage
Volts
Load Current
MAmps
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    5 Number of calculations
    R = \frac{{1000 \times (V_{\text{min}} - V_{\text{out}})}}{{I_{\text{L}} + 10}} RP = \frac{{(V_{\text{max}} - V_{\text{out}})^2}}{R} ZP = \frac{{1000 \times \left(\frac{{(V_{\text{max}} - V_{\text{out}})}}{R} \times V_{\text{out}}\right)}}{1000}

    Where:

    • IL = Load Current
    • R = Value of Resistor
    • RP = Power of Resistor
    • ZP = Power of Zener Diode