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

Infineon Technologies KTY23-6

Name: KTY23-6
Brand: Infineon Technologies
SKU: KTY23-6
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KTY23-6

Manufacturer:: Infineon Technologies

Category:: PTC Thermistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: KTY23-6.pdf

Description:: SENSOR PTC 1KOHM 3% SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:4,976

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Product details

Overview

KTY23-6 from Infineon Technologies is a silicon-based positive temperature coefficient (PTC) temperature sensor in SOT-23 package, with nominal resistance R25 = 990 Ω (min 975 Ω, max 1005 Ω at 25 °C), operating range −50 °C to +150 °C, thermal time constant τair = 7 s (typ.), and polarity-independent symmetrical construction. It serves as an analog temperature sensing element in motor winding protection circuits, HVAC refrigerant monitoring, and power supply thermal foldback control.

For engineers reviewing the KTY23-6 datasheet, KTY23-6 pinout, KTY23-6 application, or KTY23-6 equivalent, this device is selected for linearized PTC response in analog front-end temperature measurement where long-term stability, low self-heating at 1 mA bias, and SMT compatibility are required.

Technical Context

The KTY23-6 implements a planar n-conducting silicon crystal whose resistance follows a second-order polynomial function RT = R25 × (1 + α·ΔT + β·ΔT²), with α = 7.88×10⁻³ K⁻¹ and β = 1.937×10⁻⁵ K⁻² over −30 °C to +130 °C. Its output is inherently analog and requires external signal conditioning.

It operates at 1 mA nominal bias current, exhibits ±3% R25 tolerance (standard grade), and delivers a temperature factor kT = RT/R25 that ranges from 0.506 at −50 °C to 2.196 at +150 °C - enabling direct resistance-to-temperature conversion without lookup tables in microcontroller firmware.

Key Specifications

Parameter	Value and Actual Design Meaning
R25 (25 °C)	990 Ω (min 975 Ω, max 1005 Ω); defines baseline resistance for calibration and analog scaling
Temp Range	−50 °C to +150 °C; supports industrial motor, power converter, and automotive under-hood applications
Thermal τ (air)	7 s (typ.); enables responsive thermal monitoring in air-cooled enclosures without excessive filtering delay
Max Operating Current	7 mA; limits self-heating error to <0.5 °C at 1 mA bias in typical PCB mounting
Temp Coefficient	Nonlinear PTC with α = 7.88 mK⁻¹, β = 19.37 μK⁻²; allows accurate 2nd-order polynomial compensation
Package	SOT-23; surface-mount compatible with standard reflow profiles and automated assembly

Pinout & Package

Two-terminal device in SOT-23 package (JEDEC TO-236AB); symmetrical construction makes terminals electrically interchangeable - no polarity assignment required. Leads are internally connected to the silicon die via bond wires; Pin 1 and Pin 2 share identical electrical function.

Pin/Terminal	Circuit Role	Design Meaning
Terminal 1	Anode/Cathode (bidirectional)	Electrically identical to Terminal 2; used for 2-wire resistance measurement
Terminal 2	Anode/Cathode (bidirectional)	Electrically identical to Terminal 1; no voltage polarity sensitivity

Key Features

Feature	Design Value
Linearized PTC response	Second-order polynomial RT = R25(1 + α·ΔT + β·ΔT²) enables <±0.5 °C error over −30…+130 °C with firmware compensation
Long-term stability	Drift <0.1% resistance/year under continuous operation at 100 °C; suitable for 10+ year embedded systems
Fast thermal response in air	τair = 7 s (typ.) - faster than TO-92 variants (40 s), enabling real-time thermal event detection
Symmetrical construction	No polarity dependence - eliminates orientation errors during SMT placement and simplifies PCB routing

Applications

Motor Winding Protection

HVAC Refrigerant Monitoring

Use Scenario: Embedded in stator windings of industrial AC motors to detect overtemperature before insulation failure.

IC Role / Device Role / Timing Role: Analog PTC resistance element providing continuous temperature feedback to protection relay or MCU ADC.

Use Value: R25 = 990 Ω and τair = 7 s enable rapid detection of winding hotspots with minimal thermal lag vs. thermistors.

Use Scenario: Mounted on refrigerant lines in commercial HVAC chillers to monitor evaporator/condenser temperature.

IC Role / Device Role / Timing Role: Passive two-terminal sensor interfaced with op-amp current source and precision ADC.

Use Value: −50…+150 °C range covers full refrigerant cycle; ±3% R25 tolerance ensures consistent setpoint accuracy across production units.

Power Supply Thermal Foldback

Industrial PLC I/O Module Sensing

Use Scenario: Integrated into DC-DC converter feedback loop to reduce output current when heatsink temperature exceeds threshold.

IC Role / Device Role / Timing Role: Temperature-dependent resistor in voltage divider network driving comparator input.

Use Value: Polarity independence simplifies board layout; 1 mA bias minimizes self-heating impact on regulation accuracy.

Use Scenario: Mounted on terminal blocks of modular PLC I/O cards to monitor ambient temperature near field connections.

IC Role / Device Role / Timing Role: Analog temperature reference for cold-junction compensation and derating logic.

Use Value: SOT-23 footprint allows placement directly adjacent to connectors; excellent long-term stability avoids recalibration over 5+ years.

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 = 990 Ω, but TO-92 Mini package (τair = 11 s); same α/β coefficients	Slower response in air; requires through-hole assembly or adapter	Select when mechanical robustness or higher thermal mass is preferred over SMT density
NTCG163JH102HT1	Negative temperature coefficient (NTC) thermistor, R25 = 1 kΩ, B25/85 = 3950 K	Opposite resistance vs. temp slope; requires inverted signal conditioning and different calibration	Select only if existing NTC infrastructure (bias networks, firmware) is already deployed

Compared with KTY21-6 and NTCG163JH102HT1, the KTY23-6 offers superior SMT integration, faster air response, and native compatibility with PTC-oriented protection algorithms - making it optimal for space-constrained, high-dynamics thermal monitoring.

Availability

KTY23-6 is available at Aetrix Electronics and suitable for motor protection, HVAC refrigerant monitoring, power supply thermal foldback, and industrial PLC I/O module sensing requiring stable component supply across multi-year production cycles.

Supply support for KTY23-6 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 and IECQ QC 080000.

The KTY-series is part of Infineon's analog sensor portfolio, designed specifically for high-stability, linearized silicon PTC sensing in industrial temperature control and protection systems - not general-purpose thermistors.

FAQ

What is the maximum recommended bias current for continuous operation?

The absolute maximum operating current is 7 mA per datasheet, but continuous operation at 1 mA is recommended to limit self-heating error to <0.5 °C. At 5 mA, self-heating may exceed 2.5 °C in still air, degrading measurement accuracy unless compensated in firmware.

Can KTY23-6 be used in liquid immersion applications?

Yes - its SOT-23 package is qualified for oil immersion with τoil = 1 s (typ.), making it suitable for transformer oil temperature monitoring or hydraulic system fluid sensing when encapsulated or mounted in sealed housings compliant with IP67.

How is temperature calculated from measured resistance?

Using the second-order equation TA = [−α + √(α² − 4β + 4β·(RT/R25))]/(2β), where α = 7.88×10⁻³ K⁻¹ and β = 1.937×10⁻⁵ K⁻². This yields <±0.3 °C error from −30 °C to +130 °C with 16-bit ADC resolution and proper calibration.

Is KTY23-6 RoHS and REACH compliant?

Yes - Infineon confirms full RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006 compliance for KTY23-6, including lead-free solderability and halogen-free molding compound, with material declarations available upon request.

KTY23-6 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Resistance @ 25°C:: 1 kOhms

Resistance Tolerance:: ±3%

Operating Temperature:: -50°C ~ 150°C

Power - Max:: -

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: SOT-23-3

KTY23-6 FAQ

1.How can I place an order for KTY23-6 through Aetrix?

Please submit a Request for Quotation (RFQ) for KTY23-6 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 KTY23-6 reliable?

The price and inventory of KTY23-6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KTY23-6 is usually 5 days.

3.What payment methods are accepted for KTY23-6?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KTY23-6 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KTY23-6?

KTY23-6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KTY23-6 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 KTY23-6?

For technical support, including KTY23-6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KTY23-6 requirements.

6.How does Aetrix verify that KTY23-6 is sourced from the original manufacturer or authorized distributors?

All KTY23-6 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 KTY23-6 meets industry standards.

7.What is the process for return or replacement of KTY23-6?

All KTY23-6 units undergo pre-shipment inspection (PSI). If there is an issue with KTY23-6, 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 KTY23-6 part is unused and in its original packaging.

Return procedure for KTY23-6:

1.Submit a request within 90 days.

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

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