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

Infineon Technologies KT210

Name: KT210
Brand: Infineon Technologies
SKU: KT210
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KT210

Manufacturer:: Infineon Technologies

Category:: PTC Thermistors

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

Datasheet:: KT210.pdf

Description:: SENSOR PTC 1KOHM 3% TO92MINI

Quantity:: RFQ Add To RFQ list

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Inventory:3,626

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Product details

Overview

KT210 from Infineon Technologies is a silicon-based positive temperature coefficient (PTC) temperature sensor in SOT-23 package, designed for analog temperature sensing in air or liquid media. It exhibits R₂₅ = 970–1030 Ω 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). It is used in motor winding protection circuits where low thermal mass and fast response (τ_air = 11 s) are critical.

For engineers reviewing the KT210 datasheet, KT210 pinout, KT210 application, or KT210 equivalent, this part serves as a precision analog temperature transducer requiring minimal external circuitry-ideal for embedded thermal monitoring in industrial drives, HVAC actuators, and power supply thermal foldback systems.

Technical Context

The KT210 functions as a two-terminal passive resistor whose resistance varies predictably with ambient temperature. Its n-conducting silicon planar element enables stable PTC behavior across −50 °C to +150 °C, with resistance calculated using RT = R₂₅ × (1 + α·ΔT + β·ΔT²) over −30 °C to +130 °C.

It requires a constant 1 mA bias current for specified linearity and exhibits polarity-independent operation due to symmetrical construction. Thermal time constant in air is 11 s (63% ΔT), enabling responsive detection of slow-to-moderate thermal transients in enclosed mechanical assemblies.

Key Specifications

Parameter	Value and Actual Design Meaning
R₂₅ range	970–1030 Ω at 25 °C; defines baseline resistance for calibration and analog scaling
Temp range	−50 °C to +150 °C; supports operation in harsh environments like motor windings or automotive under-hood locations
Thermal τ (air)	11 s (63% ΔT); enables timely detection of thermal drift without overshoot in fan-cooled enclosures
Max operating voltage	25 V; allows direct connection to 24 V industrial control rails with series current-limiting resistor
Operating current	1 mA nominal; ensures self-heating < 0.1 °C at TA = 25 °C in still air
Resistance tolerance	±3% or ±1% at R₂₅; determines absolute temperature accuracy before system calibration
TCR model	Second-order polynomial (α = 7.88×10⁻³ K⁻¹, β = 1.937×10⁻⁵ K⁻²); enables software linearization in microcontroller firmware

Pinout & Package

SOT-23 package with two terminals; symmetrical construction makes polarity irrelevant. No internal die attach or substrate bias-pure resistive element.

Pin/Terminal	Circuit Role	Design Meaning
Terminal 1	Anode / Input	One end of PTC resistor; connects to bias current source or voltage divider top node
Terminal 2	Cathode / Output	Other end of PTC resistor; connects to ground or ADC reference point in 2-wire configuration

Key Features

Feature	Design Value
Positive temperature coefficient	Monotonic, repeatable resistance increase with temperature-enables fail-safe overtemperature detection
Fast thermal response in air	τ = 11 s enables real-time tracking of motor winding temperature rise during startup
Excellent long-term stability	<0.1% resistance drift/year ensures calibration longevity in sealed industrial modules
Linearized output via polynomial	Software compensation achieves ±0.5 °C accuracy over −30 °C to +130 °C without hardware op-amps
Polarity independence	Symmetrical terminal design eliminates orientation errors during automated SMT placement

Applications

Motor Winding Protection

Power Supply Thermal Foldback

Use Scenario: Embedded inside stator windings of AC induction motors to monitor thermal stress during overload conditions.

IC Role / Device Role / Timing Role: Passive analog temperature transducer providing continuous resistance feedback to analog front-end or comparator.

Use Value: Enables early-stage thermal shutdown before insulation breakdown; R₂₅ tolerance and stability ensure consistent trip points across production batches.

Use Scenario: Mounted on heatsink near power MOSFETs in DC-DC converters to trigger current derating when temperature exceeds safe limits.

IC Role / Device Role / Timing Role: Two-terminal analog sensor interfaced with simple voltage divider and ADC input.

Use Value: Low thermal mass (τ_air = 11 s) provides faster response than thermistors, improving converter reliability under transient load spikes.

HVAC Actuator Feedback

Industrial Pump Temperature Monitoring

Use Scenario: Integrated into damper actuator gearboxes to detect overheating caused by mechanical binding or lubricant degradation.

IC Role / Device Role / Timing Role: Analog temperature element in closed-loop position control system with thermal safety interlock.

Use Value: SOT-23 footprint allows direct PCB mounting adjacent to gearbox; ±1% R₂₅ option supports high-accuracy calibration for predictive maintenance algorithms.

Use Scenario: Surface-mounted on pump housing to monitor bearing temperature in centrifugal water pumps used in building management systems.

IC Role / Device Role / Timing Role: Resistive temperature sensor feeding into PLC analog input module via 2-wire loop.

Use Value: −50 °C to +150 °C range covers cold-start freeze risk and hot-running failure modes; TO-92 Mini alternative available for through-hole retrofit.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
KTY21-6	R₂₅ = 975–1025 Ω; identical SOT-23 package and polynomial coefficients	Same functional spec; differs only in ordering code and minor R₂₅ binning	Select when exact Infineon cross-reference is required for legacy BOM compliance
KT230	R₂₅ = 970–1030 Ω but τ_air = 7 s; same package and temp range	Faster response suits applications needing tighter thermal loop bandwidth (e.g., servo amplifier current sense)	Choose KT230 if thermal transient detection speed > KT210's 11 s is critical

Compared with KT210, KTY21-6 offers identical electrical and thermal performance with minor R₂₅ binning variation, while KT230 improves thermal response time by 36% at the cost of marginally reduced long-term stability-making it preferable for dynamic thermal control loops.

Availability

KT210 is available at Aetrix Electronics and suitable for motor protection, power supply thermal management, and HVAC actuator feedback requiring stable component supply across multi-year industrial product lifecycles.

Supply support for KT210 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 KT/KTY-series is Infineon's dedicated line of silicon PTC temperature sensors targeting high-reliability analog thermal monitoring in industrial motion control and power conversion systems.

FAQ

What is the maximum recommended bias current for KT210?

The KT210 is characterized at 1 mA operating current. Maximum continuous current is 5 mA per datasheet Absolute Maximum Ratings. Exceeding 1 mA increases self-heating error beyond ±0.1 °C in still air, degrading measurement accuracy unless compensated in firmware.

Can KT210 be used in oil or liquid immersion?

Yes-KT210 has a typical thermal time constant of 1.5 s in oil, making it suitable for liquid-level temperature monitoring or transformer oil sensing. Its SOT-23 plastic package is rated for non-corrosive liquids; use conformal coating for extended immersion reliability.

How is temperature calculated from KT210 resistance?

Temperature is derived using the second-order equation: T = [−α + √(α² − 4β × (1 − kT))]/(2β), where kT = R_T/R₂₅. Coefficients α = 7.88×10⁻³ K⁻¹ and β = 1.937×10⁻⁵ K⁻² are fixed per datasheet and valid from −30 °C to +130 °C.

Is KT210 RoHS compliant and halogen-free?

Yes-KT210 meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The SOT-23 package uses lead-free matte tin terminations and complies with JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1).

KT210 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

KT210 FAQ

1.How can I place an order for KT210 through Aetrix?

Please submit a Request for Quotation (RFQ) for KT210 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 KT210 reliable?

The price and inventory of KT210 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KT210 is usually 5 days.

3.What payment methods are accepted for KT210?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KT210 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KT210?

KT210 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KT210 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 KT210?

For technical support, including KT210 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KT210 requirements.

6.How does Aetrix verify that KT210 is sourced from the original manufacturer or authorized distributors?

All KT210 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 KT210 meets industry standards.

7.What is the process for return or replacement of KT210?

All KT210 units undergo pre-shipment inspection (PSI). If there is an issue with KT210, 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 KT210 part is unused and in its original packaging.

Return procedure for KT210:

1.Submit a request within 90 days.

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

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