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NTC thermistors can be used as inrush-current limiting devices in power supply circuits when added in series with the circuit being protected. They present a higher resistance initially, which prevents large currents from flowing at turn-on. As current continues to flow, NTC thermistors heat up, allowing higher current flow during normal operation.
Steinhart–Hart coefficients for specific commercial devices are ordinarily reported by thermistor manufacturers as part of the device characteristics. Finding characteristics from measurements of resistance at known temperatures
NTC thermistors are widely used as inrush-current limiters and temperature sensors, while PTC thermistors are used as self-resetting overcurrent protectors and self-regulating heating elements. An operational temperature range of a thermistor is dependent on the probe type and is typically between −100 and 300 °C (−148 and 572 °F).
The lower the coefficient, the greater a decrease in electrical resistance for a given temperature increase. NTC materials are used to create inrush current limiters (because they present higher initial resistance until the current limiter reaches quiescent temperature), temperature sensors and thermistors.
The National Technical Reports Library (NTRL) was created by the National Technical Information Service (NTIS), an agency of the U.S. Department of Commerce, as a means of disseminating federally-funded scientific, technical, engineering, and business information.
Example of electronic circuit with the sensistor Rs. Sensistor is a resistor whose resistance changes with temperature.. The resistance increases exponentially with temperature, [1] that is the temperature coefficient is positive (e.g. 0.7% per degree Celsius).