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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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B57211P0509M301, EPCOS

B57211P0509M301, EPCOS

Epcos B5721x Inrush Current Limiting Thermistors Applications in peripheral communication equipment e.g. switch mode power supplies Black coated Thermistor disk, flame retardant to UL94V0 Terminal wires made from tinned copper Stamped with resistance value and tolerance High stability of electrical characteristics
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RS_151-221, RS PRO

RS_151-221, RS PRO

RS Pro R-T Curve Matched Brought to you under the trusted RS Brand, these R-T curve (Resistance-Temperature) matched thermistors are small, high quality, epoxy encapsulated, precision devices. These epoxy coated interchangeable chip thermistors offer true interchangeability over wide temperature ranges, permitting the circuit designer to standardise on circuitry. This eliminates the need to individually adjust circuits and allows the thermistors to be easily replaced without the need for re-calibration.
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PRF18BF471QB5RB, Murata

PRF18BF471QB5RB, 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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NTCLE100E3221JB0, Vishay

NTCLE100E3221JB0, 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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215272-3807, Molex

215272-3807, Molex

The Molex NTC ring temperature sensor cable assemblies deliver accurate surface-temperature readings in difficult-to-reach locations. These compact assemblies include a ring terminal, thermal conductive epoxy, and / or a Micro-Lock plus connector to provide a market-ready solution for temperature sensing. This compact solution offers a 100mW maximum power rating and it is suitable for ATMs, home appliances, HVAC systems, computers, and vending machines. It cable length is 100mm and its colour is yellow. UL certified Operating temperature range -40 to +100°C or 150°C Resistance tolerance 1%
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215272-3107, Molex

215272-3107, Molex

The Molex NTC ring temperature sensor cable assemblies deliver accurate surface-temperature readings in difficult-to-reach locations. These compact assemblies include a ring terminal, thermal conductive epoxy, and / or a Micro-Lock plus connector to provide a market-ready solution for temperature sensing. This compact solution offers a 100mW maximum power rating and it is suitable for ATMs, home appliances, HVAC systems, computers, and vending machines. It cable length is 100mm and its colour is green. UL certified Operating temperature range -40 to +100°C or 150°C Resistance tolerance 1%
New items
B57213P0509M301, EPCOS

B57213P0509M301, EPCOS

Epcos B5721x Inrush Current Limiting Thermistors Applications in peripheral communication equipment e.g. switch mode power supplies Black coated Thermistor disk, flame retardant to UL94V0 Terminal wires made from tinned copper Stamped with resistance value and tolerance High stability of electrical characteristics
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B57045K0682K000, EPCOS

B57045K0682K000, EPCOS

Epcos K45 Series NTC Probe Assemblies Applications in temperature compensation, measurement and for chassis mounting Aluminium housing, electrically insulated terminal wires made from tinned copper
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B57560G1103F000, EPCOS

B57560G1103F000, EPCOS

Epcos Glass-Encapsulated Sensor Heat resistive and highly stable For temperature measurement up to 300 °C Small dimensions Leads: nickel plated wires
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TFPT0603L1001FV, Vishay

TFPT0603L1001FV, 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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