Calculadora de Relay Coil
Calcular la bobina de relé con esta herramienta en línea gratuita
Coil Characteristics
Coil Current
30.00 mA
I = V/R = 12V / 400Ω
Coil Power
360.00 mW
P = V²/R = 12² / 400
Recommended Transistor (BJT)
Min V_CE (collector-emitter)
>24.0 V
≥ 2× coil voltage
Min I_C (collector current)
>60.0 mA
≥ 2× coil current
Min Power Dissipation
>540 mW
≥ 1.5× coil power
Suggested transistors:
2N2222A, BC547, 2N3904
Flyback Diode
Min Voltage Rating
>24.0 V
Min Current Rating
>45.0 mA
Suggested: 1N4001, 1N4007 (connect cathode to V+, anode to collector)
Base Resistor (Arduino/MCU @ 5V)
Base Resistor Value
7.17 kΩ
Rb = (V_GPIO - V_BE) / (I_C_desired / h_FE)
Assumed h_FE = 100, V_BE = 0.7V
Nearest Standard Value
7 kΩ
Base resistor power: 2.58 mW
Quickly get accurate results with this free relay coil calculator. Everything runs locally in your browser for maximum privacy.
Características Principales
Free relay coil calculator with instant results
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How to Use Relay Coil Calculator
Enter Your Data
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Casos de Uso
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Professional and academic applications
Quick reference and verification
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Preguntas Frecuentes
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Absolutely. All processing happens locally in your browser. Your data is never sent to any server.
Does the Relay Coil Calculator work on mobile?
Yes, the tool is fully responsive and works on phones, tablets, and desktop computers.
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