Linear PTC Thermistor Precision Temperature Sensing (KTY Series)

The characteristics of the Linear PTC thermistors are based on the properties of the silicon chemical element silicon, in this case

The performance of the temperature sensor is as stable as this chemical element. This means that the temperature drift over the life of the product is negligible. In recent tests, this was validated when the sensor worked at maximum operating temperature of 10,000 hours (equal to 1.14 years), a typical 0.2 K drift is shown, with a maximum drift of 0.4 K to 0.8 K.

Long term stability

Supposing that the sensor is used at half of the specified maximum temperature typically , our Silicon sensor will have the low drift described in Table 1 for at least 450,000 hours (equal to 51 years). This calculation is based on
Arrhenius equation (activation energy = 0.7 eV).

Si batch process products

As our products are based on silicon technology, we benefit indirectly from advances in this field due to development of microprocessors, computer memory, etc. In addition, this indirect benefit extends to packaging technology, its trend is miniaturization and high volume mass production.

Linear PTC thermistor behaviour is as stable as this chemical element.  This means that temperature drifts during the lifetime of  the products are negligible. In recent tests this has been verified, when sensors operating at their maximum.

2.Different dimension:

Dimension(Unit: mm):

3.Different Key features shown as below

Linear ptc thermistors are characteristic by

1. 1. KTY series products are axial lead glass encapsulated type.
   2. The main material of KTY linear ptc thermistoris semiconductor Silicon single crystal, also known as Silicon PTC Thermistor.
   3. The resistance value rises linearly with the increase of temperature, also known as linear positive temperature coefficient thermistor or linear ptc thermistor.
   4. Accuracy: High precision with deviations typically 1%,2%,3%,5%, meeting stringent application requirements.
   5. Dissipation coefficient: 2.5~5mW/℃
   6. OperatingTemperature Range: Varies by model, typically from -55°C to +150°C, ensuring suitability for diverse environments.
   7. EncapsulatedTypes:small size, strong structure,available in compact, robust packages (e.g., SOT-23, TO-92) for easy integration into various applications.
   8. Glass Encapsulated:can be used in high temperature and high humidity and other harsh environment
   9. Maximum working current: Iopr=1.0mA
   10. Stability: annual change rate ≤0.01℃/ year
   11. Temperature coefficient: α25/50≥0.7%/℃, that is, α25/50≥7000PPM
   12. Rated power: 50mW
   13.  

Applications and Use Cases

KTY series Linear ptc thermistors are widely used in below industries of temperature control, temperature measurement, temperature compensation:

Automotiveindustry

Engine temperature monitoring, climate control systems, and battery management.

Industrial Automation

HVAC systems, industrial process control, equipment temperature monitoring.Circuit and crystal oscillator precision temperature compensation.Micro motor speed control

Consumer Electronics

Refrigerators, air conditioners, and wearable health devices for accurate temperature sensing.Medical device temperature detection and control system.

Household Appliances

applications range from coffee makers to hair dryers, providing reliable thermal management.

Communication, instrumentation, and computing

Linear ptc thermistorkTY81 to kTY84 find extensive application for temperature compensation, surge suppression, and current limiting in circuits of communication, instrumentation, and computing. They are used to ensure reliable performance and safety in diverse electronic devices.

Product Overview and Specifications

Linear PTC thermistors increase resistance with temperature in a linear manner, surpassing PTC polymer ceramic thermistors by eliminating the need for linear compensation, thus simplifying circuit design.

Unlike general KTY thermistors that require linear compensation due to nonlinear resistance-temperature changes, this KTY product maintains a linear resistance-temperature relationship from -40°C to 300°C, simplifying circuit design. Common PTC thermistors have narrow linear regions and are typically used for overcurrent and overload protection rather than temperature detection and compensation. This KTY product, however, enhances applications in these areas.

Thermistors with the same temperature coefficient can be connected in series or parallel without altering their temperature-resistance characteristics. For instance, a 1K 2000PPM thermistor can be connected in series to form a 2K 2000PPM or in parallel to form a 500Ω 2000PPM. This flexibility facilitates convenient circuit experiments, optimal data acquisition, and mass production.

Working Principle

The resistance value of linear PTC thermistor increases with the temperature increasing and changes in a straight line.These KTY81-KTY84 products can maintain the linear change of resistance in the temperature region of -40℃ -250℃.

Selection Guide

Factors to Consider When Selecting a KTY Thermistor

Temperature Range
Ensure the thermistor's operating range matches the temperature extremes of your application.

Accuracy Requirements
Match the thermistor's accuracy specifications with the tolerance requirements of your temperature measurement. Common tolerance of the linear ptc thermistor is 1%,2%,3%,5%.

Encapsulated Type
Choose the encapsulated size and type that fits your mounting method and space constraints.

KTY Series Part Numbers

Linear PTC Thermistors KTY Series Part Number：

1.Series: KTY Series Linear PTC Thermistors-KTY series
2.Type：81-KTY81 ,82-KTY82, 83-KTY83 ,84-KTY84
3.Resistance R25：1-1KΩ, 2-2KΩ
4.Tolerance：F-±1% ,G-±2% ,H-±3%, J-±5%
5.Tolerance limit: 0-±Tolerance, 1- -Tolerance, 2-+Tolerance

Specification & Part Numbers