Shockley Diode Calculator

Your details

Choose which quantity to solve for. The other becomes the known input.
Reverse saturation current order of magnitude. Silicon signal diodes typically range from 1 pA to 10 nA.
Multiplier for the saturation current. Combined with the exponent: Is = coefficient x 10^exponent.
Also called the emission coefficient. Ideal diodes: n = 1. Real silicon diodes: n is typically 1 to 2. Schottky diodes: close to 1.
Junction temperature in degrees Celsius. Room temperature is 25 degC, which gives a thermal voltage of about 25.85 mV.
degC
Voltage across the diode anode to cathode. Positive = forward bias. Silicon diodes typically drop 0.6 - 0.7 V in forward conduction.
mV
Diode current (I)Normal forward conduction
13.8707mA

Current flowing through the diode at the specified forward voltage

Thermal voltage (Vt)25.693mV
Saturation current (Is)1 x 10^-12 A
Power dissipation8.322mW
Dynamic resistance (rd)1.85ohm
13.8707 mA
Sub-threshold<0.001Low current0.001-1Normal conduction1-100High current100+

13.871 mA flowing through the diode junction.

  • Thermal voltage at 25 degC is 25.69 mV. At room temperature (25 degC) this is about 25.85 mV.
  • Forward voltage of 600 mV is within the typical 600-700 mV silicon diode drop at room temperature.
  • Power dissipation is 8.32 mW. Verify this is within the diode's rated power.
  • Small-signal dynamic resistance is 1.85 ohm at this operating point (rd = 1Vt / I).

Next stepFor a real circuit, add a series resistor to limit current and compute the operating point using Ohm's law. The dynamic resistance helps you model how the diode behaves to small AC signals.

 = Powered by OnlyCalculators