Linear PTCThermistorsPrecision Temperature Sensing–KTY Series
KTY Series linear ptc thermistorIntroduction:
KTY series thermistors are advanced temperature sensing devices renowned for their accuracy and reliability across various industrial and consumer applications. Developed by Siemens, these KTY series Linear PTC thermistors such as KTY81, KTY82, KTY83, KTY84 are used in electronic engineering for temperature measurement and compensation circuits.
Advantages of KTY Series Thermistors
Linearpositive temperature coefficient thermistor is made of PTC material and physical process. It has superior stability, compound linearity, millions of repetitions withunchanged characteristic curve. The resistance value increases with the increase of temperature, and the change is linear, and the linearity is good.
Good consistency of resistance value, strong interchangeability, good shape and specification. Fast temperature sensing speed with 1-2 seconds in the air medium, high sensitivity. Small size, solid structure, standardized appearance, suitable for automatic installation of printed circuit boards.
- Precision and Reliability: Provide accurate temperature readings crucial for maintaining optimal system performance.
- Versatility: Available in a variety of models with different temperature ranges and resistance values to suit diverse applications.
- Durability: Designed to withstand harsh environmental conditions, ensuring long-term reliability.
- Ease of Integration: Compact packages and standardized specifications facilitate easy integration into existing designs.
Difference between KTY81, KTY82, KTY83, KTY84:
1.Different Drift of Silicon ptc thermistor:
After 10000 hours of permanent operation at the maximum operating temperature with nominal operating current.
| KTY TYPE | TYPICALDRIFT(K) | MAXIMUMDRIFT(K) |
| KTY81-1 ,KTY82-1 | 0.20 | 0.50 |
| KTY81-2 ,KTY82-2 | 0.20 | 0.80 |
| KTY83 | 0.15 | 0.40 |
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).
Sibatchprocessproducts
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 ofthe 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:
| KTYType | Resistance(Ω） at 25℃ | Available Tolerance (ΔR) | Operation Temperature Range(°C) | Package Type |
| KTY81-1 | 1000 | ±1%upto±5% | −55 to150 | SOD70 |
| KTY81-2 | 2000 | ±1%upto±5% | −55 to150 | SOD70 |
| KTY82-1 | 1000 | ±1%upto±5% | −55 to150 | SOT23 |
| KTY82-2 | 2000 | ±1%upto±5% | −55 to150 | SOT23 |
| KTY83-1 | 1000 | ±1%upto±5% | −55 to175 | SOD68(DO-34) |
| KTY84-1 | 1000(R100) | ±3%upto±5% | −40 to300 | SOD68(DO-34) |
Linear ptc thermistorsare characteristic by:
- KTY series products are axial lead glass encapsulatedtype.
- The main material of KTY linear ptc thermistoris semiconductor Silicon single crystal, also known as Silicon PTC Thermistor.
- The resistance value rises linearly with the increase of temperature, also known as linear positive temperature coefficient thermistor or linear ptc thermistor.
- Accuracy: High precision with deviations typically 1%,2%,3%,5%,meeting stringent application requirements.
- Dissipation coefficient: 2.5~5mW/℃
- OperatingTemperature Range: Varies by model, typically from -55°C to +150°C, ensuring suitability for diverse environments.
- EncapsulatedTypes:small size, strong structure,available in compact, robust packages (e.g., SOT-23, TO-92) for easy integration into various applications.
- Glass Encapsulated:can be used in high temperature and high humidity and other harsh environment
- Maximum working current: Iopr=1.0mA
- Stability: annual change rate ≤0.01℃/ year
- Temperature coefficient: α25/50≥0.7%/℃, that is, α25/50≥7000PPM
- Rated power: 50mW
Applications and Use Cases
KTY series Linear ptc thermistorsare widely used in belowindustries 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 circuitsof communication, instrumentation, and computing. They are used to ensurereliable performance and safety in diverse electronic devices.
Product Overview and Specifications
The resistance value of linear ptc thermistorincreases with the increase of temperature, and the linear change is good, which is better than the PTC thermistor synthesized by PTC polymer ceramics, and no need linear compensation measures to simplify the circuit design.
There are nonlinear changes of resistance and temperature in the general KTY thermistor, so it is necessary to design a linear compensation circuit. This KTY product can maintain the linear change of resistance and temperature in the -40 ° -250 ° region, thus simplifying the circuit. At present, the temperature resistance characteristics of the common PTC thermistor are mutational, and the linear region is very narrow, which is usually used for overcurrent and overload protection of the circuit, and is not used for temperature detection and temperature compensation circuits. This KTY product just complements this multifaceted application field.
The thermistor with the same temperature coefficient can connection in series or in parallel, and its temperature resistance characteristic remainsunchanged, for example :lK 2000PPM, can be connected in series into 2K 2000PPM or in parallelinto 500Ω 2000PPM, that can provide convenient circuit experiments, can obtain the best data, easy to mass productionof order.
Working Principle
The resistance value of linear PTC thermistorincreases with the temperature increasing and changes in a straight line.These KTY81-KTY84productscan maintain the linear change of resistance in the temperature regionof -40℃-250℃.
Selection Guide
When selecting a KTY thermistor, consider the following factors:
- 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%,.
- EncapsulatedType: Choose the encapsulatedsize and typethat fits your mounting method and space constraints.
Axial lead glass encapsulated type Linear PTC ThermistorsKTY Series Part Number：
1.Series: Axial lead glass encapsulated type 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 No.:
| Item | Part No. | Resistance(Ω）at 25℃ | Rated Current | Max Current | Remarks | ||
| Min | Max | Tolerance (±%) | Itype(mA) | Imax(mA) | |||
| 1 | KTY81-110 | 990 | 1010 | ±1% | 5 | 8 | |
| 2 | KTY81-120 | 980 | 1020 | ±2% | 5 | 8 | |
| 3 | KTY81-121 | 980 | 1000 | ±2% | 5 | 8 | |
| 4 | KTY81-122 | 1000 | 1020 | ±2% | 5 | 8 | |
| 5 | KTY81-150 | 950 | 1050 | ±5% | 5 | 8 | |
| 6 | KTY81-151 | 950 | 1000 | ±5% | 5 | 8 | |
| 7 | KTY81-152 | 1000 | 1050 | ±5% | 5 | 8 | |
| 8 | KTY81-210 | 1980 | 2020 | ±1% | 5 | 8 | |
| 9 | KTY81-220 | 1960 | 2040 | ±2% | 5 | 8 | |
| 10 | KTY81-221 | 1960 | 2000 | ±2% | 5 | 8 | |
| 11 | KTY81-222 | 2000 | 2040 | ±2% | 5 | 8 | |
| 12 | TY81-250 | 1900 | 2100 | ±5% | 5 | 8 | |
| 13 | TY81-251 | 1900 | 2000 | ±5% | 5 | 8 | |
| 14 | KTY81-252 | 2000 | 2100 | ±5% | 5 | 8 | |
| 15 | KTY82-110 | 990 | 1010 | ±1% | 5 | 8 | |
| 16 | KTY82-120 | 980 | 1020 | ±2% | 5 | 8 | |
| 17 | KTY82-121 | 980 | 1000 | ±2% | 5 | 8 | |
| 18 | KTY82-122 | 1000 | 1020 | ±2% | 5 | 8 | |
| 19 | KTY82-150 | 950 | 1050 | ±5% | 5 | 8 | |
| 20 | KTY82-151 | 950 | 1000 | ±5% | 5 | 8 | |
| 21 | KTY82-152 | 1000 | 1050 | ±5% | 5 | 8 | |
| 22 | KTY82-210 | 1980 | 2020 | ±1% | 5 | 8 | |
| 23 | KTY82-220 | 1960 | 2040 | ±2% | 5 | 8 | |
| 24 | KTY82-221 | 1960 | 2000 | ±2% | 5 | 8 | |
| 25 | KTY82-222 | 2000 | 2040 | ±2% | 5 | 8 | |
| 26 | KTY82-250 | 1900 | 2100 | ±5% | 5 | 8 | |
| 27 | KTY82-251 | 1900 | 2000 | ±5% | 5 | 8 | |
| 28 | KTY82-252 | 2000 | 2100 | ±5% | 5 | 8 | |
| 29 | KTY83-200 | 200 | ±1%~±5% | 5 | 8 | ||
| 30 | KTY83-500 | 500 | ±1%~±5% | 5 | 8 | ||
| 31 | KTY83-550 | 550 | ±1%~±5% | 5 | 8 | ||
| 32 | KTY83-600 | 600 | ±1%~±5% | 5 | 8 | ||
| 33 | KTY83-1000 | 1000 | ±1%~±5% | 5 | 8 | ||
| 34 | KTY83-1200 | 1200 | ±1%~±5% | 5 | 8 | ||
| 35 | KTY83-1400 | 1400 | ±1%~±5% | 5 | 8 | ||
| 36 | KTY83-1500 | 1500 | ±1%~±5% | 5 | 8 | ||
| 37 | KTY83-1600 | 1600 | ±1%~±5% | 5 | 8 | ||
| 38 | KTY83-2000 | 2000 | ±1%~±5% | 5 | 8 | ||
| 39 | KTY83-4000 | 4000 | ±1%~±5% | 5 | 8 | ||
| 40 | KTY83-4050 | 4050 | ±1%~±5% | 5 | 8 | ||
| 41 | KTY83-4500 | 4500 | ±1%~±5% | 5 | 8 | ||
| 42 | KTY83-110 | 990 | 1010 | ±1% | 5 | 8 | |
| 43 | KTY83-120 | 980 | 1020 | ±2% | 5 | 8 | |
| 44 | KTY83-121 | 980 | 1000 | ±2% | 5 | 8 | |
| 45 | KTY83-122 | 1000 | 1020 | ±2% | 5 | 8 | |
| 46 | KTY83-150 | 950 | 1050 | ±5% | 5 | 8 | |
| 47 | KTY83-151 | 950 | 1000 | ±5% | 5 | 8 | |
| 48 | KTY83-152 | 1000 | 1050 | ±5% | 5 | 8 | |
| 49 | KTY84-130 | 970(at100℃) | 1030(at100℃) | R100=±3% | 5 | 8 | Mainly used for motor protection |
| 50 | KTY84-150 | 950(at100℃) | 1050(at100℃) | R100=±5% | 5 | 8 | |
| 51 | KTY84-151 | 950(at100℃) | 1000(at100℃) | R100=±5% | 5 | 8 | |
| 52 | KTY84-152 | 1000(at100℃) | 1050(at100℃) | R100=±5% | 5 | 8 | |
Conclusion
KTY series thermistors stand as benchmarks in temperature sensing technology, catering to the stringent requirements of automotive, industrial automation, and consumer electronics sectorsetc.
