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 — ឥតគិតថ្លៃ លឿន និងដំណើរការនៅក្នុងកម្មវិធីរុករករបស់អ្នក។ មិនចាំបាច់ដំឡើងទេ គ្រាន់តែបើក ហើយចាប់ផ្តើមប្រើវា។
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