Un termistor es un sensor de temperatura por resistencia. Su funcionamiento se basa en la variación de la resistividad que presenta un semiconductor con la temperatura. El término termistor proviene de Thermally Sensitive Resistor. Existen dos tipos de termistor: \n* NTC (Negative Temperature Coefficient) – coeficiente de temperatura negativo \n* PTC (Positive Temperature Coefficient) – coeficiente de temperatura positivo (también llamado posistor). Cuando la temperatura aumenta, los tipo PTC aumentan su resistencia y los NTC la disminuyen.

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A thermistor is a type of resistor whose resistance is dependent on temperature, more so than in standard resistors. The word is a portmanteau of thermal and resistor. Thermistors are widely used as inrush current limiter, temperature sensors (Negative Temperature Coefficient or NTC type typically), self-resetting overcurrent protectors, and self-regulating heating elements. (Positive Temperature Coefficient or PTC type typically). Thermistors are of two opposite fundamental types: \n* With NTC, resistance Decreases as temperature rises to protect against inrush overvoltage conditions. Commonly installed series in a circuit. \n* With PTC, resistance Increases as temperature rises to protect against overcurrent conditions. Commonly installed series in a circuit. Thermistors differ from resistance temperature detectors (RTDs) in that the material used in a thermistor is generally a ceramic or polymer, while RTDs use pure metals. The temperature response is also different; RTDs are useful over larger temperature ranges, while thermistors typically achieve a greater precision within a limited temperature range, typically −90 °C to 130 °C.

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