Radial Lead Resin Coated NTC Thermistor for Temperature Compensation

Why NTC Thermistor Is Use for Temperature Compensation?

NTC thermistor Temperature Compensation

NTC thermistor Temperature Compensation

Since all metals used for coil windings have a positive temperature coefficient of resistance, NTC thermistors are especially useful for compensating resistance changes in devices subjected to temperature variations.
Due to the high temperature coefficient of the  thermistor as opposed to the low temperature coefficient of the copper, full compensation can be achieved by using a  thermistor– resistor network. This network adds less than 15% to the total impedance of the circuit. Compensation of transistor amplifiers, crystal oscillators, etc. can be achieved by using similar methods.

NTC Thermistor for Temperature Measurement Compensation Features:

  • AMF11 series in radial lead, resin coated form, diameter after coating 6.5mm.
  • Wide R25 resistance range from 10 ohm–200k ohm.
  • Typical resistance @25C 15 ohm, 100 ohm, 200 ohm, 500 ohm, 1k ohm, 2k ohm,3k ohm, 4k ohm, 5k ohm, 10k ohm, 15k ohm, 20k ohm, 30k ohm, 47k ohm, 50k ohm, 100k ohm, 200k ohm, etc.
  • Resistance tolerance can be 5%, 10%, 20%.
  • Rated power 0.5W.
  • Operating temperature: -55C–+125C.

Application Examples

  • Temperature compensation in electronic circuit.
  • Temperature compensation of meter,instrument and other computation equipment.
  • Temperature compensation of instrumentation winding coil, integrated circuits, crystal oscillator Temperature measurement and control which do not have very high accuracy requests.

NTC Thermistor for Temperature Measurement /Compensation Application Principle and Circuit Example

circuit for a thermostat temperature controller

circuit for a thermostat temperature controller,  A simple circuit configuration for a thermostat, Circuit for a temperature controller

NTC Thermistor Temperature compensation in transistor

NTC Thermistor Temperature compensation in transistor,  Push-pull compensation.

LCD temperature compensation circuit

LCD temperature compensation circuit

Temperature Compensation NTC Thermistor Dimension

Temperature Compensation NTC Thermistor Dimension

Schematic drawing of a temperature compensation circuit of Liquid crystal displays (LCDs) using NTC thermistor as temperature sensor

For Liquid crystal displays LCD modules often a temperature compensation circuit is used, consisting of NTC thermistors and resistors. The NTC thermistor as main temperature-sensitive device with its characteristic resistance temperature curve provides a high driving voltage in the cold and a low driving voltage in the hot temperature region, compensating in this way the LCD temperature characteristic.

AMWEI NTC Thermistors for Temperature Measurement  Compensation Data Sheet

AMWEI Part NumberResistance @25C
(R25)
Beta value B(25/50C)Dissipation factor
(mW/C)
Thermal time constant
(S)
Operating temperature
(C)
R25 range
(Ohm)
Tolerance
(%)
B(25/50C)
(K)
Tolerance
(%)
AMF11-□□8-24±5
±10
±15
±20
2800±10≥6.0mW/C
in still air
≤30s
in still air
-55~+125C
25-1193000
120~3593200
360~14003600
1500~59003950
6000~120004050
13000~170004150
18000~440004250
45000~790004300
80000~1440004400
145000~1990004500
200000~2990004600
300000-5000004750

Note: The first □ for filling in Resistance @25C(R25), the second □ for filling in resistance tolerance.

NTC Thermistor for Temperature Measurement Compensation Reliability Data

Test
Standard
Test Conditions
ΔR25/R25 (typical)
Remarks
Storage in dry heatIEC 60068-2-2Storage at upper category temperature, Temperature:125C, Time: 1000h
<3%
No visible damage
Storage in damp heat, steady stateIEC 60068-2-3Temperature of air:40C, Relative humidity of air:93%, Duration: 21 days
<3%
No visible damage
Rapid temperature cyclingIEC 60068-2-14Lower test temperature:-55C, Upper test temperature: 125C, Number of cycles:100
<3%
No visible damage
Endurance\Pmax:450mW, t:1000h
<3%
No visible damage
Long-term stability\Temperature: 125C, Time:10000h
<5%
No visible damage

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