Zener Diode Calculator
Calculate zener diode with this free online tool
Series Resistor
276.0 Ω
Rs = (Vs - Vz) / (I_load + I_z_min) = (12 - 5.1) / (20mA + 5mA)
Nearest standard: 280 Ω
Voltage Regulation Output
5.10 V
Regulated output ≈ Vz = 5.1V (when Vs > Vz and I_z ≥ 5mA)
Resistor Power Dissipation
172.50 mW
Pr = (Vs - Vz)² / Rs
Use a resistor rated at least 0.35W for safety margin
Zener Power Dissipation
Under load:
127.50 mW
No load (worst case):
127.50 mW
Use a zener rated at least 0.26W
Circuit Summary
Input
12.0 V
Regulated Output
5.10 V
Load Current
20.0 mA
Min Zener Current
5.0 mA
Zener Diode Calculator — free, fast, and works in your browser. No setup required, just open and start using it.
Key Features
Free zener diode calculator with instant results
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Professional-grade zener diode calculator tool
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How to Use Zener Diode Calculator
Enter Your Data
Input your values or data into the zener diode calculator tool fields
Configure Options
Adjust any optional settings or parameters for your specific needs
Get Instant Results
The tool automatically calculates and displays results in real-time
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Copy the results to clipboard or use them directly in your project
Repeat as Needed
Run the tool again with different inputs — unlimited usage, completely free
Use Cases
Use zener diode calculator for personal projects
Professional and academic applications
Quick reference and verification
Everyday productivity and convenience
Frequently Asked Questions
Is the Zener Diode Calculator free to use?
Yes, the Zener Diode Calculator is completely free with no registration required. Use it as many times as you need.
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No account needed. All tools work instantly in your browser without any signup or login.
Is my data safe?
Absolutely. All processing happens locally in your browser. Your data is never sent to any server.
Does the Zener Diode Calculator work on mobile?
Yes, the tool is fully responsive and works on phones, tablets, and desktop computers.
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