701001 Sensors, Transducers

Series:	4400
Packaging:	Bulk
Part Status:	Active
Resistance in Ohms @ 25°C:	100
Resistance Tolerance:	±0.2°C
B Value Tolerance:	±0.8%
B0/50:	2854K
B25/50:	--
B25/75:	--
B25/85:	2873K
B25/100:	--
Operating Temperature:	-80°C ~ 100°C
Length - Lead Wire:	3.00" (76.20mm)
Mounting Type:	Free Hanging
Package / Case:	Bead

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Introduction to NTC Thermistors

NTC thermistors, or Negative Temperature Coefficient (NTC) thermistors, are thermally sensitive resistors that demonstrate a large change in resistance when exposed to a change in temperature. They are made of semi-conductive materials, such as sintered metal oxides, which reacts to changes in temperature. NTC thermistors are widely used in a variety of applications and can be used to measure temperature more accurately than some other types of thermistors.

Structure of NTC Thermistors

NTC thermistors are typically composed of a material that is a mixture of two or more metal oxides, such as tungsten, cobalt, nickel, and manganese oxide, which are pressed and sintered together to form a ceramic bead. This ceramic bead has a resistance that is dependent on temperature. The metal oxide mixture also includes a glass binder that helps give the thermistor its shape, while also helping to increase the thermistor’s stability. NTC thermistors are packaged in either glass or plastic housings to protect them against environmental stresses and corrosive agents.

Applications of NTC Thermistors

NTC thermistors are widely used due to their wide temperature range. They are used in applications that range from consumer electronic products to industrial controls and medical equipment. NTC thermistors are commonly used in temperature sensors, temperature control systems, over-temperature protection systems, and thermostats. They are used in heating and cooling systems, electric appliances, and automotive systems. NTC thermistors are also used in residential weather stations, as well as in test and measurement equipment. In addition to temperature sensing, NTC thermistors are used in motion detection, over-current protection, flame sensing, humidity sensing, flow sensing, and energy metering. NTC thermistors are also used in medical equipment, such as X-ray machines and blood pressure monitors, to detect changes in temperature.

Working Principle of NTC Thermistors

The working principle of NTC thermistors is based on the relationship between temperature and resistance. As temperature increases, the resistance of an NTC thermistor decreases. This decrease in resistance is caused by the thermistor material’s electronic properties, which become more conductive at higher temperatures. In applications in which the resistance of a thermistor is used to measure temperature, the resistance of the thermistor is measured and compared to a known reference voltage. This voltage can then be used to calculate the temperature. The reference voltage is typically supplied by a dedicated circuit, such as an operational amplifier circuit or an NTC voltage divider circuit.

Conclusion

NTC thermistors are thermally sensitive resistors that have a wide range of uses in many applications. NTC thermistors are composed of metal oxides which form a ceramic bead, and are packaged in glass or plastic housings. NTC thermistors are used in temperature sensing, motion detection, over-current protection, flame sensing, humidity sensing, and flow sensing. The working principle of NTC thermistors is based on the relationship between temperature and resistance, which is the resistance of the thermistor material becoming more conductive at higher temperatures.

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