DC95F202ZN

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NTC thermistors are temperature sensors that have been developed for applications where a good accuracy over a wide temperature range is essential. The DC95F202ZN is one such example. It is a precision Type 2 NTC thermistor that can measure temperatures from -20 to 50 degrees Celsius with an accuracy of ±0.5 degrees Celsius.

The thermistor is a temperature-sensing device composed of a semiconductor metal oxide material whose resistance changes in proportion to its temperature, making it incredibly sensitive to minor changes in temperature. This makes them ideal for use in extreme applications like cryogenics, refrigeration, and medical use.

The DC95F202ZN employs two types of sensing elements. The first is an actual thermistor, which is a semiconductor made of a metal oxide such as tantalum, silicon, zinc oxide, or titanium oxide. This thermistor exhibits a highly temperature-dependent resistance-temperature coefficient (RTC). As the temperature of the device increases, the resistance of the thermistor changes in proportion to its temperature.

The second type of sensing element is a nominal resistor. Whereas a thermistor\'s resistance varies significantly with temperature, the resistance of the nominal resistor is very temperature invariant, allowing it to serve as a calibration point to maintain the accuracy of the device over a wide temperature range. These resistors can also be used to reduce the PCB area, reduce cost, and provide a visual indication of the device state.

In operation, the DC95F202ZN thermistor measures the resistance of both the thermistor and the nominal resistor using a charge injection technique. The thermistor\'s resistance is adjusted by injecting a small current into the thermistor\'s terminals and measuring the resulting voltage. This process is repeated with the nominal resistor and the two values are compared. If the difference between the two values is greater than a predetermined threshold, the thermistor\'s resistance is adjusted based on the nominal resistor value. This adjustment is done continuously and ensures that the thermistor remains calibrated for accurate temperature readings over a wide temperature range.

The DC95F202ZN is useful in many fields where reliable and accurate temperature measurements are needed. These include automotive, HVAC, and medical applications. The device is small but feature-packed, and its ability to measure temperatures from -20 to 50 degrees Celsius with an accuracy of ±0.5 degrees Celsius makes it an ideal choice for many applications.

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