Diode Equation Calculator (Shockley Equation)
Use this calculator to determine the current flowing through a diode based on its voltage, saturation current, and thermal voltage using the classic Shockley equation.
What this calculator is doing
This calculator applies the Shockley diode equation, which describes the current-voltage (I-V) relationship of an ideal diode: \[ I = I_S \times \left( e^{\frac{V_D}{n V_T}} - 1 \right) \] Where: - \( I \) = Diode current (A) - \( I_S \) = Saturation current (A), a very small constant for the diode - \( V_D \) = Applied voltage across the diode (V) - \( V_T \) = Thermal voltage (V), approximately 25.85 mV at 25°C - \( n \) = Ideality factor (typically between 1 and 2 for real diodes) The thermal voltage is calculated as: \[ V_T = \frac{k T}{q} \] where: - \( k \) = Boltzmann's constant = 1.380649 x 10⁻²³ J/K - \( q \) = Charge of an electron = 1.602176634 x 10⁻¹⁹ C - \( T \) = Temperature in Kelvin (K) This equation is fundamental in modeling diodes in electronics design and simulation.
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