Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Reference Resistance (Ω) (Ω)

Required number input.

Temperature coefficient (1/°C) (1/°C)

Required number input.

Temperature (°C) (°C)

Required number input.

Reference Temperature (°C) (°C)

Required number input.

Estimate PTC thermistor resistance near a reference temperature using the supplied linear temperature coefficient; real PTC curves can be strongly nonlinear. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Resistance (Ω) (Ω)

The resulting resistance (ω) returned as a number.

• Thermistor resistance equations approximate a specified curve and temperature range. Beta value, Steinhart–Hart coefficients, tolerance, self-heating, lead resistance, thermal lag, aging, and interchangeability determine achievable temperature accuracy.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

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  Estimate capacitance change from a linear ppm/°C coefficient and temperature difference. Many ceramic dielectric classes are nonlinear, so this model should only be used where a linear tempco is specified.

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