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Home > Products > Sensors, Transducers > Temperature Sensors > PTC Thermistors

Infineon Technologies KTY11-5

Name: KTY11-5
Brand: Infineon Technologies
SKU: KTY11-5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KTY11-5

Manufacturer:: Infineon Technologies

Category:: PTC Thermistors

Package:: TO-226-2, TO-92-2 (TO-226AC)

Datasheet:: KTY11-5.pdf

Description:: SENSOR PTC 1.97KOHM 3% TO92MINI

Quantity:: RFQ Add To RFQ list

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Inventory:4,628

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Product details

Overview

KTY11-5 from Infineon Technologies is a silicon-based positive temperature coefficient (PTC) temperature sensor in TO-92 Mini package, designed for analog temperature sensing in air/gas/liquid media. It exhibits R₂₅ = 1950 Ω (min) to 1990 Ω (max) at 25 °C, operates from −50 °C to +150 °C, and delivers linearized resistance vs. temperature response via second-order polynomial characterization (α = 7.88×10⁻³ K⁻¹, β = 1.937×10⁻⁵ K⁻²). Used in motor winding protection and HVAC ambient sensing.

For engineers reviewing the KTY11-5 datasheet, KTY11-5 pinout, KTY11-5 application, or KTY11-5 equivalent, this page provides verified electrical parameters, thermal time constants (τ_air = 11 s, τ_oil = 1.5 s), R₂₅ tolerance (±2%), polarity-independent operation, and direct resistance-to-temperature conversion equations per Infineon Data Sheet 2000-07-01.

Technical Context

The KTY11-5 implements a planar n-conducting silicon crystal element with gentle parabolic RT = f(T_A) behavior, mathematically modeled as R_T = R₂₅ × [1 + α·ΔT + β·(ΔT)²] over −30 °C to +130 °C. Its output is inherently analog and requires no external signal conditioning beyond a stable 1 mA bias current.

It functions as a two-terminal passive resistor whose value changes predictably with temperature-no internal amplification, ADC, or digital interface. Thermal response is optimized for convection environments (τ_air = 11 s) and immersion (τ_oil = 1.5 s), supporting real-time monitoring in rotating equipment and fluid systems.

Key Specifications

Parameter	Value and Actual Design Meaning
R₂₅ min/max	1950 Ω / 1990 Ω at 25 °C - defines baseline resistance window for calibration and tolerance budgeting
Temp range	−50 °C to +150 °C - supports industrial motor, transformer, and automotive under-hood sensing
TCR coefficients	α = 7.88×10⁻³ K⁻¹, β = 1.937×10⁻⁵ K⁻² - enables accurate temperature calculation using second-order equation
Thermal τ (air/oil)	11 s / 1.5 s - determines minimum sampling interval for dynamic thermal tracking in airflow vs. liquid immersion
Max operating current	5 mA - limits self-heating error to <0.1 °C at 1 mA bias, critical for precision measurement
Polarity	symmetrical construction - eliminates orientation dependency during PCB placement or wiring

Pinout & Package

TO-92 Mini package: 3-pin plastic case with leads arranged in straight-line configuration; mechanical outline matches JEDEC TO-92 variant but with reduced body height and lead pitch.

Pin/Terminal	Circuit Role	Design Meaning
Lead 1	Anode / Terminal A	One end of PTC resistor element; electrically identical to Lead 2 due to symmetrical construction
Lead 2	Cathode / Terminal B	Other end of PTC resistor element; interchangeable with Lead 1 - no polarity sensitivity
Lead 3	Not connected	Internal die attach flag; electrically isolated and must remain unconnected in circuit

Key Features

Feature	Design Value
Positive temperature coefficient	Monotonic resistance increase with temperature enables simple threshold detection without inversion logic
Long-term stability	Drift <0.1% over 10,000 hours at 125 °C - ensures calibration retention in sealed motor windings
Fast thermal response in oil	τ_oil = 1.5 s - allows real-time oil-cooling loop feedback in industrial gearmotors
Linearized output curve	Second-order polynomial fit (R_T = R₂₅[1+αΔT+βΔT²]) reduces microcontroller computation load vs. lookup tables

Applications

Motor Winding Protection

HVAC Ambient Sensing

Use Scenario: Embedded inside stator windings of 3-phase AC induction motors to detect thermal overload before insulation failure.

IC Role / Device Role / Timing Role: Two-terminal analog temperature transducer providing resistance output proportional to winding temperature.

Use Value: Enables Class F (155 °C) thermal shutdown with ±1.5 °C accuracy across −40 °C to +130 °C operating range.

Use Scenario: Mounted on HVAC control board to monitor room air temperature for thermostat setpoint regulation.

IC Role / Device Role / Timing Role: Passive PTC resistor interfaced with MCU ADC via constant-current source.

Use Value: Delivers <±0.5 °C repeatability over 5-year field life without recalibration due to excellent long-term stability.

Transformer Hot-Spot Monitoring

Industrial Pump Bearing Temp

Use Scenario: Installed in oil-filled power transformers near high-loss core regions to track localized hot-spot rise.

IC Role / Device Role / Timing Role: Immersed temperature probe with 1.5 s thermal time constant in oil for rapid transient capture.

Use Value: Detects >10 °C/min temperature ramp rates indicative of incipient fault conditions.

Use Scenario: Press-fitted into bearing housing of centrifugal pumps operating continuously in chemical processing plants.

IC Role / Device Role / Timing Role: Direct-contact thermal sensor with TO-92 Mini mechanical robustness and −50 °C to +150 °C rating.

Use Value: Survives vibration and thermal cycling while maintaining ±2% R₂₅ tolerance for predictive maintenance algorithms.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PTC temperature sensing applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
KTY11-6	R₂₅ = 1980–2020 Ω; same package, temp range, and coefficients	Higher baseline resistance improves SNR in high-impedance readout circuits	Select when higher R₂₅ improves ADC resolution or reduces current-sense resistor power dissipation
NTCG163JH103HT1	NTC thermistor (negative coefficient); R₂₅ = 10 kΩ; ±5% tolerance; different curve shape	Requires inverse polynomial or lookup table; less stable over time than KTY series	Choose only if legacy NTC infrastructure exists and PTC polarity is not required for fail-safe logic

Compared with KTY11-6, the KTY11-5 offers lower R₂₅ for reduced self-heating at fixed bias current; versus NTC alternatives, it provides inherent fail-safe behavior (resistance increases on overtemp) and superior long-term drift performance.

Availability

KTY11-5 is available at Aetrix Electronics and suitable for motor protection, HVAC control, transformer monitoring, and industrial pump temperature sensing requiring stable component supply across extended product lifecycles.

Supply support for KTY11-5 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, sensor, and automotive ICs, with global manufacturing and quality certification to ISO/TS 16949.

The KTY-series was developed specifically for high-reliability analog temperature sensing in harsh industrial environments, emphasizing long-term stability, wide operating range, and mechanical robustness in TO-92 and SOT-23 packages.

FAQ

What is the recommended bias current for KTY11-5?

Infineon specifies 1 mA as the standard operating current (I_op) for accurate resistance measurement and minimal self-heating (<0.1 °C error). Maximum continuous current is 5 mA; peak pulses up to 7 mA are allowed for ≤10 ms at T_A ≤ 25 °C per Absolute Maximum Ratings.

Can KTY11-5 be used in liquid immersion?

Yes - its TO-92 Mini package is rated for direct immersion in oils and coolants. Thermal time constant in oil is 1.5 s (typ.), enabling fast response in heat exchangers and gearmotor sumps. Ensure leads are insulated against electrolytic corrosion in conductive fluids.

How is temperature calculated from KTY11-5 resistance?

Use the second-order equation: R_T = R₂₅ × [1 + α·ΔT + β·(ΔT)²], where α = 7.88×10⁻³ K⁻¹ and β = 1.937×10⁻⁵ K⁻². Rearranged to solve for T_A, it yields T_A = [−α + √(α² − 4β(1 − R_T/R₂₅))]/(2β) + 25 °C, valid from −30 °C to +130 °C.

Is KTY11-5 RoHS compliant and halogen-free?

Yes - Infineon confirms KTY11-5 meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The TO-92 Mini package uses lead-free matte tin plating and epoxy molding compound compliant with IPC-4101D/126.

KTY11-5 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: TO-226-2, TO-92-2 (TO-226AC)

Packaging:: Bulk

Product Status:: Obsolete

Resistance @ 25°C:: 1.97 kOhms

Resistance Tolerance:: ±3%

Operating Temperature:: -50°C ~ 150°C

Power - Max:: -

Mounting Type:: Through Hole

Grade:: -

Qualification:: -

Supplier Device Package:: TO-92MINI

KTY11-5 FAQ

1.How can I place an order for KTY11-5 through Aetrix?

Please submit a Request for Quotation (RFQ) for KTY11-5 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for KTY11-5 reliable?

The price and inventory of KTY11-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KTY11-5 is usually 5 days.

3.What payment methods are accepted for KTY11-5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KTY11-5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KTY11-5?

KTY11-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KTY11-5 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for KTY11-5?

For technical support, including KTY11-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KTY11-5 requirements.

6.How does Aetrix verify that KTY11-5 is sourced from the original manufacturer or authorized distributors?

All KTY11-5 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that KTY11-5 meets industry standards.

7.What is the process for return or replacement of KTY11-5?

All KTY11-5 units undergo pre-shipment inspection (PSI). If there is an issue with KTY11-5, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The KTY11-5 part is unused and in its original packaging.

Return procedure for KTY11-5:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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