![]() For example, a 10 kΩ thermistor is the standard that is built into laser packages. For more sophisticated applications, such as laser stabilization detectors, optical blocks, and charge coupled devices, the thermistor is built in. Some of the most common uses of thermistors are in digital thermometers, in cars to measure oil and coolant temperatures, and in household appliances such as ovens and refrigerators, but they are also found in almost any application that requires heating or cooling protection circuits for safe operation. They are ideal when very precise temperatures are required. While they do not work well with excessively hot or cold temperatures, they are the sensor of choice for applications that measure temperature at a desired base point. Thermistors are easy to use, inexpensive, sturdy, and respond predictably to changes in temperature. The direction of the arrow or bar is not significant. The arrow by the T signifies that the resistance is variable based on temperature. This range is dependent on the base resistance.įigure 1: Thermistor Symbol - US and Japan Typically, a thermistor achieves high precision within a limited temperature range of about 50✬ around the target temperature. ![]() This type of thermistor is generally used as a fuse. When temperature increases, the resistance increases, and when temperature decreases, resistance decreases. This type of thermistor is used the most.Ī PTC thermistor works a little differently. Conversely, when temperature decreases, resistance increases. With an NTC thermistor, when the temperature increases, resistance decreases. ![]() There are two types of thermistors: Negative Temperature Coefficient (NTC) and Positive Temperature Coefficient (PTC). It is made of metallic oxides, pressed into a bead, disk, or cylindrical shape and then encapsulated with an impermeable material such as epoxy or glass. The term is a combination of “thermal” and “resistor”. A thermistor is a resistance thermometer, or a resistor whose resistance is dependent on temperature. ![]()
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