Article Summary
Read the datasheet in order
A 100 kΩ NTC thermistor datasheet describes one specific component series; “100k” alone is not enough to select a substitute. Use the datasheet to confirm the reference resistance, R/T curve, tolerances, operating limits and package, then compare those values with the controller and the installed probe assembly. This guide explains what OEM buyers and design engineers should verify without assuming a particular manufacturer or model.
What “100k” identifies
“100k” generally refers to nominal resistance at a stated reference temperature. Confirm the reference point and tolerance on the actual datasheet rather than assuming every series uses the same condition. Parts with the same nominal resistance may have different B-value intervals and therefore different resistance–temperature curves; they are not automatically interchangeable.
Check the manufacturer’s exact part number and revision. Do not infer that this page represents a specific 100 kΩ product stocked by Starlight. The TDK NTC technical guide describes how rated resistance, B value and their tolerances affect the curve across temperature.
Specifications to verify
- Resistance and reference temperature: confirm the nominal value, test condition and initial resistance tolerance.
- R/T behavior: check the B value together with its stated temperature interval, or use the supplier’s tabulated curve/coefficients for the exact series.
- Temperature limits and tolerance: confirm the permitted operating range and how resistance/temperature accuracy changes over the range you will use.
- Electrical limits: verify rated power, measurement current and dissipation conditions so the measurement circuit does not cause unacceptable self-heating.
- Thermal and mechanical data: review time constant, dissipation factor, dimensions, mounting, leads and environmental limits for the actual assembly.
For the meaning of an R/T table and B-value interval, see the NTC curve guide. For divider choice, ADC range, wiring and self-heating checks, see the NTC circuit selection guide.
Apply the data to an OEM design
First confirm that the controller firmware expects the same nominal resistance and curve as the proposed thermistor. Then assess the complete probe: sensing location, thermal contact, response requirement, temperature range, moisture or chemical exposure, cable and connector. A bare element’s datasheet may not describe the finished probe’s response or environmental capability.
Validate representative assemblies at multiple temperatures using the production controller and mounting method. Record the datasheet revision, part number, calibration/curve source and test conditions so substitutions and production lots can be reviewed consistently. Browse the NTC sensor range or the NTC sourcing checklist for related selection steps.
For an OEM review or quotation, provide the exact datasheet/part number, target temperature range, tolerance, probe dimensions/material, cable/connector, environment, annual volume and validation needs. If you need a finished probe rather than a bare thermistor, see our custom NTC thermistor probe assembly page for configuration details. Send the application requirements for review; availability and suitability must be confirmed for the selected configuration.
