Diode Junction Temperature Rise Calculator
Use this calculator to estimate the temperature rise of a diode's junction based on its power dissipation and thermal resistance to ambient.
What this calculator is doing
This calculator estimates the junction temperature (Tj) of a diode or LED given its electrical and thermal parameters. The power dissipated in the diode is calculated as: \[ P = V_f \times I_f \] Where: - \( V_f \) = Forward voltage drop (V) - \( I_f \) = Forward current (A) Then the junction temperature is computed as: \[ T_j = T_{\text{ambient}} + P \times R_{\theta \text{(JA)}} \] Where: - \( T_j \) = Junction temperature (°C) - \( T_{\text{ambient}} \) = Ambient temperature (°C) - \( R_{\theta \text{(JA)}} \) = Thermal resistance junction-to-ambient (°C/W) This helps assess whether a diode will overheat in your application, which is critical for reliability, especially for power diodes, rectifiers, and LEDs.
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