Open-Base BJT Breakdown Voltage Calculator

Estimate the breakdown voltage $V_{BR}$ using: $$ V_{BR} \approx n\, V_T \ln\!\Biggl(\frac{I_{\text{break}}}{I_S} + 1\Biggr) $$

* $V_T$ is typically 0.025 V at room temperature.

Step 1: Enter Parameters

Reverse Saturation Current, $I_S$ (A):

e.g., 1×10⁻¹² A

Breakdown Current, $I_{\text{break}}$ (A):

e.g., 1×10⁻⁶ A (current at which breakdown occurs)

Ideality Factor, $n$:

e.g., 1 (typical value between 1 and 2)

Thermal Voltage, $V_T$ (V):

e.g., 0.025 V at room temperature

Calculated Breakdown Voltage