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What are thermistor ICs?

A thermistor is installed in a broad selection of circuitry and printed circuit boards for temperature assessment, also for the current-limiting monitoring system. The resistance alteration of a thermistor is based on the ambient temperature of the component. The conduction model is used to classify thermistors. Thermistors with a positive temperature coefficient (PTC) exhibit more resistance at higher temperatures than thermistors with a negative temperature coefficient (NTC). As a result, the resistance of a PTC thermistor is inversely proportional to temperature.

Types of thermistor ICs

Depending on the materials used, thermistors are classified into two types:

With an NTC thermistor, resistance decreases as the temperature rises, typically due to a rise in conduction electrons raised by thermal excitement from the valence shell. An NTC is typically used as a temperature detector, or in a sequence with a circuit as an inrush voltage confiner.

With PTC thermistors, withstand raises as the temperature rises, commonly due to enhancement in thermal lattice excitement, especially those that are not refined and imperfect. PTC thermistors are typically used in series with a circuit board and are employed to secure and resist overcurrent circumstances through resettable fuses.

Typical applications

As an alternative to fuses, as current-limiting devices for circuit protection. A minor degree of resistive heating results from current flowing through the device.

Most CRT displays use them as timers in the degaussing coil circuit. The thermistor and degaussing coil both experience current flow when the display unit is first turned on.

In the automobile industry, a heater is used to heat the diesel before engine injection in cold climates or to offer additional heat to the cabin when using a diesel engine.

In voltage-controlled oscillators for temperature-compensated synthesizers.

To provide the heat required to cause the wax to expand in an electrically powered wax motor.

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PRF18BA471QB1RB, Murata

0603 PRF Series Overheat Sensing Overheat sensing for power transistors, power ,diodes and power ICs in hybrid circuits. Excellent thermal response Solid-state construction provides excellent mechanical vibration and impact resistance Contactless operation provides noiseless operation Dimensions LxWxT 1.60 x 0.80 x0.80mm

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PTGL07BD330N3B51B0, Murata

Murata PTGL Series The PTGL series of PTC thermistors are leaded and can be used for over current protection. Tolerances of +/- 10 % Narrow current range Small size with quick operating time Non contact design means prolonged life and silent operation Solid element for stength against mechanical vibration and shock Thermistors - PTC (Positive Temperature Coefficient) Positive temperature coefficient Thermistor is designed for general purpose over-current, over-voltage, and direct over temperature protection. Applications in TV tube degaussing, choke and transformer protection, time delay, motor starting, liquid level sensors and overflow protection for oil tanks.

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PRG18BC3R3MM1RB, Murata

POSISTOR® PRG Series 0603 and 0805 Chip Type PTC Thermistors for Overcurrent Protection POSISTOR® PRG series 0603 and 0805 chip type PTC thermistors for overcurrent protection with resettable function enabling repeated use. These POSISTOR® PTC thermistors have a rapid operation in overcurrent conditions. This series is suitable for use as current limiting resistors and as a countermeasure to short circuit testing. Features & Benefits: Rapid operation in an overcurrent condition Overcurrent protection with resettable function, can be used repeatedly Can be used as current limiting resistors Dimensions LxWxT 1.60 x 0.80 x 0.80 mm

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PTGL13AR6R8M6C01B0, Murata

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TFPT0603L3900FV, Vishay

0603 TFPT Series Linear PTC A range of high stability thin-film linear PTC thermistors from Vishay in compact SMT packages. The devices have an alumina substrate base with nickel based PTC thin film resistive element and provide high stability and repeatability over a wide temperature range. Temperature coefficient +0.41%/°K at 25°C Operating temperature range - 55 to +150 °C Available in 5% or close tolerance 1% versions Compact 0603 size SMT package cUL recognized component: File E148885 Compliant to RoHS Directive 2002/95/EC Halogen-free according to IEC 61249-2-21 definition

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B57153S0150M000, TDK

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B57464S0209M000, TDK

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B57364S0409M000, TDK

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NB12K00103KBB, AVX

0805,1206 NB12 - NB20 Series High quality chip thermistors Nickel barrier metallization giving outstanding solderability qualities Applications include temperature compensation and temperature control of printed circuits

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NCP15XQ471J03RC, Murata

NTC Thermistors SMD 0402 - NCP15X series Negative temperature coefficient thermistors. High precision Beta reports and resistors. Excellent long-term stability. Nickel barrier electrodes. Reflow soldering possible. Applications: Temperature sensors, transistor temperature compensation, integrated circuits, oscillating circuits, telecommunications.<tab/>

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B57230V2103F260, EPCOS

0402, 0603 ,0805 B57 Series SMD NTC Thermistors This Series of EPCOS SMD NTC thermistors can be used for temperature measurement and compensation. The 0402 and 0603 series are the automotive series and the 0805 is the standard series. Features & Benefits: Multilayer SMD NTC with inner electrodes Nickel barrier termination Excellent long-term aging stability in a high-temperature environment Superior resistance stability during soldering (change Approvals IEC 60068-1

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NTCLE100E3473JB0, Vishay

Vishay NTC Thermistors 0.5W 640 series Negative Temperature Coefficient Thermistors (NTC) are semiconductor resistors whose resistance, at zero dissipation, decreases when the temperature varies either by the joule effect, with the ambient temperature or through a combination of the two. Measurement and checking of the temperature (thermometer, thermostat, sensor), current draw limiters and temperature compensation circuits for transistor circuits are some of the main applications for thermistors. Rated dissipation: 0.5 W Operating temperature: –40 °C → +150 °C

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Thermistor ICs

What are thermistor ICs?

Types of thermistor ICs

Typical applications

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