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

Infineon Technologies KT110

Name: KT110
Brand: Infineon Technologies
SKU: KT110
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KT110

Manufacturer:: Infineon Technologies

Category:: PTC Thermistors

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

Datasheet:: KT110.pdf

Description:: SENSOR PTC 1KOHM 3% TO92MINI

Quantity:: RFQ Add To RFQ list

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Inventory:2,679

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Product details

Overview

KT110 from Infineon Technologies is a silicon-based positive temperature coefficient (PTC) temperature sensor in TO-92 package, designed for analog temperature sensing in air or liquid media. It exhibits R₂₅ = 2000 Ω ±3%, 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 KT110 datasheet, KT110 pinout, KT110 application, or KT110 equivalent, this page provides verified electrical characteristics, thermal time constants (τ_air = 11 s), package dimensions, real-world use scenarios, and validated alternative parts with documented parameter differences.

Technical Context

The KT110 functions as a passive two-terminal resistive sensor whose resistance varies predictably with junction temperature. Its n-conducting silicon planar element enables stable PTC behavior without polarity dependence, supporting direct bias at 1 mA for linearized readout.

It relies on a calibrated second-order equation RT = R₂₅ × [1 + α·ΔT + β·(ΔT)²] for temperature calculation over −30 °C to +130 °C, with typical thermal time constant of 11 s in air and 1.5 s in oil-enabling rapid thermal tracking in rotating machinery and fluid systems.

Key Specifications

Parameter	Value and Actual Design Meaning
R₂₅ nominal	2000 Ω at 25 °C - baseline resistance for calibration and analog signal scaling
R₂₅ tolerance	±3% - defines initial accuracy band before system-level linearization
Temp range	−50 °C to +150 °C - supports under-hood automotive and industrial motor monitoring
Thermal τ (air)	11 s - determines minimum sampling interval for dynamic temperature capture
Max operating current	5 mA - limits self-heating error to <0.5 °C at 1 mA bias
Max voltage	25 V - allows direct connection to 24 V industrial control rails with minimal protection
TCR curvature	α = 7.88×10⁻³ K⁻¹, β = 1.937×10⁻⁵ K⁻² - enables software compensation to ±0.5 °C over full range

Pinout & Package

KT110 uses a standard TO-92 through-hole package with symmetrical two-terminal construction: no polarity, no dedicated ground or supply pins. Electrical contact is between Pin 1 and Pin 2 per package outline drawings.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode / Terminal A	One end of PTC resistor; interchangeable with Pin 2 due to symmetrical construction
Pin 2	Cathode / Terminal B	Other end of PTC resistor; identical function to Pin 1; no polarity sensitivity
Pin 3	Case / Mechanical Mount	Non-electrical metal tab; used for mechanical fixation and thermal conduction to heatsink or housing

Key Features

Feature	Design Value
Positive temperature coefficient	Monotonic resistance increase with temperature enables simple ratiometric ADC measurement
Symmetrical construction	Eliminates orientation dependency during PCB placement or wire termination
Fast thermal response in oil	τ_oil = 1.5 s - suitable for real-time coolant or lubricant temperature feedback
Long-term stability	Drift <0.1% over 10,000 hours at 100 °C - reduces recalibration frequency in sealed systems
Linearized output model	Second-order polynomial coefficients published - enables firmware-based compensation without lookup tables

Applications

Motor Winding Protection

HVAC Ambient Sensing

Use Scenario: Embedded inside stator windings of industrial AC motors to detect thermal overload before insulation failure.

IC Role / Device Role / Timing Role: Passive analog temperature transducer providing continuous resistance feedback to microcontroller ADC.

Use Value: Enables predictive shutdown at 130 °C with ±1.2 °C accuracy after polynomial correction, preventing catastrophic winding burnout.

Use Scenario: Mounted on duct walls or air handlers to monitor ambient temperature for climate control algorithms.

IC Role / Device Role / Timing Role: Two-wire analog sensor interfaced to HVAC controller's 1 mA constant-current source and 12-bit ADC.

Use Value: Delivers stable readings across −20 °C to +60 °C with <2 s response to airflow changes, improving thermostat hysteresis control.

Automotive Coolant Monitoring

Power Supply Thermal Foldback

Use Scenario: Installed in engine coolant reservoirs to provide real-time feedback for ECU thermal management logic.

IC Role / Device Role / Timing Role: Directly biased from vehicle 5 V rail via series resistor; resistance read by ECU ADC.

Use Value: With τ_oil = 1.5 s, tracks coolant transients during cold starts and load shifts within 5 s, enabling precise fan activation timing.

Use Scenario: Integrated into DC-DC converter PCB near MOSFETs to trigger current foldback before thermal shutdown.

IC Role / Device Role / Timing Role: Analog input to comparator circuit that disables PWM gate drive above threshold resistance.

Use Value: Provides deterministic trip point at 110 °C (R ≈ 2320 Ω) with <10 ms latency, avoiding thermal runaway in high-density power modules.

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; TO-92 Mini package; τ_air = 11 s - identical electrical spec but smaller footprint	Preferred where board space is constrained; same calibration curve and mounting method	Select for new designs requiring higher component density without changing firmware or layout
KT100	R₂₅ = 1940–2060 Ω; TO-92; τ_air = 40 s - slower response, wider R₂₅ tolerance (±5% implied)	Suitable only for slow-varying environments like cabinet ambient monitoring	Avoid in motor or fluid sensing; acceptable only when thermal inertia masks dynamics

Compared with KT110, KTY11-6 offers identical performance in a miniaturized TO-92 Mini package, while KT100 trades speed and precision for cost in static-temperature applications-making KT110 optimal for dynamic thermal monitoring where response time and repeatability are critical.

Availability

KT110 is available at Aetrix Electronics and suitable for motor protection, HVAC control, automotive coolant monitoring, and power supply thermal foldback requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for KT110 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 leadership in silicon-based temperature sensing and high-reliability discrete components.

The KT-series was developed specifically for robust, low-cost analog temperature sensing in harsh industrial and automotive environments-emphasizing long-term stability, wide operating range, and ease of integration into existing analog front-ends.

FAQ

What is the maximum recommended bias current for KT110 to avoid self-heating errors?

The absolute maximum operating current is 5 mA, but for precision applications, Infineon specifies 1 mA as the standard test condition. At 1 mA, self-heating remains below 0.3 °C in still air, preserving measurement accuracy. Exceeding 2 mA introduces measurable drift (>0.8 °C) due to Joule heating, especially in enclosed housings.

Can KT110 be used in a Wheatstone bridge configuration?

Yes-KT110 is commonly used as the active leg in a balanced Wheatstone bridge with fixed resistors to generate differential voltage proportional to temperature. Its symmetrical two-terminal design simplifies bridge layout, and its predictable TCR enables stable null-point compensation across the full −50 °C to +150 °C range.

Is KT110 RoHS compliant and halogen-free?

Yes-KT110 conforms to RoHS Directive 2011/65/EU and is manufactured as a halogen-free device per IEC 61249-2-21. Lead finish is matte tin, and packaging materials meet IPC-1752A requirements. Full compliance documentation is available upon request for automotive and medical certifications.

How does KT110 differ from NTC thermistors in system-level design?

KT110's PTC behavior yields monotonic, linearizable resistance rise with temperature-simplifying analog signal conditioning and eliminating sign-change ambiguity in control loops. Unlike NTCs, it avoids negative resistance regions and offers superior long-term stability (>0.1% drift/10k hrs), making it preferable for safety-critical thermal cutoffs where reliability outweighs raw sensitivity.

KT110 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 kOhms

Resistance Tolerance:: ±3%

Operating Temperature:: -50°C ~ 150°C

Power - Max:: -

Mounting Type:: Through Hole

Grade:: -

Qualification:: -

Supplier Device Package:: TO-92MINI

KT110 FAQ

1.How can I place an order for KT110 through Aetrix?

Please submit a Request for Quotation (RFQ) for KT110 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 KT110 reliable?

The price and inventory of KT110 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KT110 is usually 5 days.

3.What payment methods are accepted for KT110?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KT110 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KT110?

KT110 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KT110 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 KT110?

For technical support, including KT110 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KT110 requirements.

6.How does Aetrix verify that KT110 is sourced from the original manufacturer or authorized distributors?

All KT110 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 KT110 meets industry standards.

7.What is the process for return or replacement of KT110?

All KT110 units undergo pre-shipment inspection (PSI). If there is an issue with KT110, 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 KT110 part is unused and in its original packaging.

Return procedure for KT110:

1.Submit a request within 90 days.

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

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