NC20M00333KBA

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Thermistors are widely used in temperature sensing applications thanks to their steep temperature-resistance relationship which gives them a high sensitivity to temperature. The NC20M00333KBA is a temperature sensor manufactured by Vishay Intertechnology that uses an NTC thermistor. NTC thermistors are devices whose electrical resistance decrease with increasing temperature, providing a reliable method of accurately measuring temperatures between -40 and +150°C.

The NC20M00333KBA is a negative temperature coefficient (NTC) thermistor and has a resistance value of 33 kΩ at 25°C. Additionally, its resistance decreases with temperature. This allows the device to act as a temperature sensor and measure temperatures in the range of -40 to +150°C. As it is a small, 0402 size (measuring 1 × 0.5 × 0.4 mm) it is suitable for applications that require a compact temperature sensor.

The NC20M00333KBA is typically used to measure temperatures in a range of consumer and industrial products, for example refrigerators, ovens and air conditioners. It is therefore found in many household electronics. It is also designed for automotive applications, such as air-fuel control and ABS sensors, meaning it can also be used in car engines and brakes.

The working principle of the NC20M00333KBA is based on the resistance-temperature relationship of NTC thermistors. The thermistor behaves as a semiconductor and has a resistance that changes in inverse proportion to temperature. As it is a negative temperature coefficient device, its resistance decreases with increasing temperature. This change in resistance can be measured directly or indirectly to determine the temperature of the environment.

The transfer function of an NTC thermistor is non-linear. The resistance-temperature curve for the NC20M00333KBA features three distinct sections; a steep temperature-resistance drop from 0°C to 40°C, a relatively flat region from 40°C to 130°C and finally a steep temperature-resistance rise from 130°C to 150°C. Because of this behaviour the changes in resistance of the thermistor can be accurately translated to changes in temperature, making it a highly accurate temperature sensor.

In order to take advantage of the thermistor’s temperature sensing capabilities it must be connected to a measuring circuit. An NTC thermistor is usually used with either a voltage divider network or a current source circuit. A voltage divider is the simplest type of measuring circuit and requires two resistors. This creates a voltage drop across the thermistor which can then be measured by a microcontroller. A current source circuit consists of an amplifier and a current source, and works by measuring the voltage across the thermistor. The current through the thermistor remains constant which facilitates more accurate temperature readings.

In summary, the NC20M00333KBA is an NTC thermistor manufactured by Vishay Intertechnology which is designed for measuring temperatures between -40 and +150°C. It is highly accurate and can be used with either a voltage divider or current source circuit for measuring temperature. It is commonly used in household and automotive applications, such as refrigerators, ovens, air conditioners, air-fuel control and ABS sensors.

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