Diode Series Resistor Operating Point Calculator
Solve a forward Shockley diode and series-resistor DC operating point from entered model parameters.
YOUR CALCULATION
Result
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Calculation steps
Work through one step at a time or reveal the complete calculation. The steps use your current inputs.
How to calculate
Bracket junction voltage between zero and the nonnegative supply and solve both model equations together.
I=Is expm1(Vd/(nVT)); I=(Vs−Vd)/R; VT=kT/q
Worked example
At zero supply the model current and junction voltage are zero. Doubling series resistance lowers current at a fixed positive supply.
Assumptions and input details
Forward ideal Shockley model only, no breakdown, series diode resistance, self-heating or device rating. Values are entered parameters rather than component specifications or build guidance.
Unit definitions
Unit selection is independent of language. Each selector contains only units for its physical quantity. Calculations use defined base units internally.
SI prefixes are explicit: for example, milli means one thousandth, micro one millionth and kilo one thousand. Changing a unit changes the interpretation of the entered number.
Using this calculator
Can I enter my own problem?
Yes. Replace the example values with your own inputs. The result, calculation steps, tables and applicable diagrams update from those inputs. Blank or invalid values clear the result; example values are never silently substituted for missing inputs.
Are the results exact?
Results use floating-point arithmetic and displayed rounding. Read the formula, assumptions and any stated data precision before interpreting the result.
Is my input uploaded?
The calculation runs in your browser. No account, file upload or external AI service is required. Inputs are not saved between page reloads.
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