Description
resistance = referenceResistance*factor; derivative = referenceResistance*temperatureCoefficient.
Electrical dissipation and temperature coefficients depend on operating conditions and component reference values. A calculated loss, local temperature factor or supplied-rating margin is only part of a thermal and reliability assessment.
resistance = referenceResistance*factor; derivative = referenceResistance*temperatureCoefficient.
When to use this tool
Use Resistor Junction Temperature Sensitivity when checking one supplied loss, temperature or power-margin term.
How to use the tool and how it works
- Enter referenceResistance, temperatureCoefficient, referenceTemperature, junctionTemperature. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read resistance, derivative. Use the output convention below.
Require positive referenceResistance and positive factor 1+temperatureCoefficient*(junctionTemperature-referenceTemperature). resistance = referenceResistance*factor; derivative = referenceResistance*temperatureCoefficient.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| referenceResistance | Reference Resistance | Required. Finite number; strictly above 0. |
| temperatureCoefficient | Fractional resistance change per temperature unit, not ppm unless converted. | Required. Finite number. |
| referenceTemperature | Reference Temperature | Required. Finite number. |
| junctionTemperature | Junction Temperature | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| resistance | Electrical resistance; use ohms with SI electrical inputs. | Required. Finite number. |
| derivative | Derivative | Required. Finite number. |
{
"input": {
"referenceResistance": 100,
"temperatureCoefficient": 0.01,
"referenceTemperature": 20,
"junctionTemperature": 30
},
"output": {
"resistance": 110.00000000000001,
"derivative": 1
}
}Limitations and assumptions
- Temperature differences must match the coefficient's reciprocal temperature unit. This linear model does not estimate junction temperature or prove safe operation.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use manufacturer ratings, thermal paths, derating and transient conditions for a complete practical design.
References
Similar or alternative tools
- Electricity: Resistor Delta Temperature Coefficient Step
resistance = referenceResistance*factor; relativeChange = factor-1.
- Resistor Self Heating Power Coefficient
fractionalResistancePerPower = thermalResistance*temperatureCoefficient; resistancePerPower additionally multiplies reference resistance.