An NTC thermistor is a thermally sensitive resistor that changes its resistance based on slight temperature changes. Thermistors are used in a wide range of applications but must commonly alter resistances based on a device's temperature or the medium surrounding it. Thermistors allow users to detect broad temperatures and overload cut-outs. You will most often find an NTC thermistor in circuitry because it provides a cost-effective and simple sensing temperature method.
NTC thermistors have special properties, which means they should not be used for all temperature sensing applications. Use an NTC thermistor when you need resistance to decrease when temperature increases.
The four most common applications of thermistors include:Digital Thermostats – modern thermostats require high-levels of efficiency for monitoring temperature.
Lower-Temperature Thermometers – thermistors work exceptionally well in freezing temperatures. You will find these devices in freezers and other sub-zero devices.
In-Rush Protection – NTC thermistors are often used in limiting a device’s supply to power circuits. Limiting in-rush currents is an essential component of building electronic equipment and circuits. The thermistor presents a high initial resistance that prevents large currents from flowing when devices are switched-on. As the limiter heats up, the resistance is lowered, and a higher current flow rate begins. It is important to keep in mind that in-rush limiting thermistors are often double in size than temperature sensing variants.
Battery Pack Protection – thermistors are frequently used to monitor battery pack temperature (while charging). When electronics begin to overheat, they can break and catch fire. Li-ion batteries, which power most phones, are very sensitive to overcharging, and so thermistors are used to protect you and your device.
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