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

Infineon Technologies KT230

Name: KT230
Brand: Infineon Technologies
SKU: KT230
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KT230

Manufacturer:: Infineon Technologies

Category:: PTC Thermistors

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

Datasheet:: KT230.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:2,589

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Product details

Overview

KT230 from Infineon Technologies is a silicon-based positive temperature coefficient (PTC) temperature sensor in SOT-23 package, designed for precision analog temperature sensing in automotive and industrial control loops. It exhibits R₂₅ = 970–1030 Ω at 25 °C, operates from −50 °C to +150 °C, and delivers linearized resistance output with ±1% or ±3% tolerance options. Used in motor winding protection and HVAC refrigerant monitoring.

For engineers reviewing the KT230 datasheet, KT230 pinout, KT230 application, or KT230 equivalent, this page provides verified electrical characteristics, thermal time constant data, package dimensions, real-world use cases, and validated alternative parts for thermal sensing in high-reliability embedded systems.

Technical Context

The KT230 implements a planar n-conducting silicon crystal element whose resistance follows a second-order polynomial function of temperature: 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. Its symmetrical two-terminal construction ensures polarity independence and eliminates orientation sensitivity in PCB layout.

With a typical thermal time constant τ_air = 7 s and τ_oil = 1 s, the device responds rapidly to ambient or immersed temperature changes. Maximum operating current is 5 mA (DC), and peak current handling is rated at 7 mA for ≤10 ms pulses - critical for transient-suppressed bias networks.

Key Specifications

Parameter	Value and Actual Design Meaning
R₂₅ Range	970–1030 Ω at 25 °C; defines baseline resistance for calibration and scaling of analog front-end circuits
Temp Range	−50 °C to +150 °C; supports under-hood automotive and industrial motor control environments
TCR Curve	Second-order polynomial fit (α = 7.88×10⁻³ K⁻¹, β = 1.937×10⁻⁵ K⁻²); enables accurate digital compensation without lookup tables
Thermal τ (air)	7 s (typ.); determines minimum sampling interval for stable readings in airflow applications
Max I_op	5 mA DC; sets upper limit for bias resistor selection to avoid self-heating error >0.1 °C
Tolerance	±1% or ±3% at R₂₅; directly impacts absolute temperature accuracy before system-level calibration

Pinout & Package

SOT-23 three-pin surface-mount package with symmetrical two-terminal configuration: Pin 1 and Pin 2 are electrically connected internally; Pin 3 is not bonded and serves as mechanical support only. No polarity dependency - either terminal may serve as input or return.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode / Terminal A	Electrically tied to Pin 2; used as one side of PTC resistance path
Pin 2	Cathode / Terminal B	Internally shorted to Pin 1; completes two-terminal resistive element
Pin 3	NC (No Connect)	Unbonded lead; no electrical function - mechanical anchor only

Key Features

Feature	Design Value
Positive Temperature Coefficient	Monotonic, predictable resistance increase with temperature - simplifies analog signal conditioning
Linearized Output	Second-order polynomial behavior enables <1 °C error over −30 °C to +130 °C with single-point calibration
Fast Thermal Response	τ_oil = 1 s enables real-time monitoring of liquid-cooled components like inverters or compressors
Polarity Independence	Symmetrical construction eliminates PCB layout constraints and reduces assembly errors

Applications

Motor Winding Protection

HVAC Refrigerant Monitoring

Use Scenario: Embedded inside stator windings of BLDC motors to detect thermal runaway during overload or cooling failure.

IC Role / Device Role / Timing Role: Two-terminal analog temperature transducer providing continuous resistance feedback to MCU ADC.

Use Value: Enables early-stage overtemperature shutdown before insulation breakdown - extends motor lifetime by >30% in field deployments.

Use Scenario: Mounted on refrigerant lines in automotive climate control systems to regulate compressor speed and prevent icing.

IC Role / Device Role / Timing Role: Passive PTC sensor interfaced via constant-current source and ratiometric ADC.

Use Value: Delivers ±0.5 °C accuracy across −40 °C to +125 °C range, meeting OEM HVAC closed-loop control requirements.

Industrial Power Supply Thermal Sensing

Automotive Battery Pack Cell Monitoring

Use Scenario: Surface-mounted on heatsinks of SMPS power stages to throttle output during thermal derating.

IC Role / Device Role / Timing Role: Analog temperature reference for analog comparator or microcontroller thermal management firmware.

Use Value: With τ_air = 7 s, it tracks slow thermal drifts without overshoot - avoids false trips during transient load steps.

Use Scenario: Integrated into battery module interconnects to monitor cell-to-cell temperature gradients in 48 V mild-hybrid packs.

IC Role / Device Role / Timing Role: Low-power, high-stability PTC element used with multiplexed 12-bit ADC channels.

Use Value: ±1% R₂₅ tolerance and excellent long-term stability reduce need for per-cell recalibration over 10-year service life.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
KTY23-6	R₂₅ = 990–1010 Ω; same SOT-23 package and thermal specs; tighter R₂₅ binning	Identical use cases but optimized for higher-volume production requiring narrower initial tolerance	Select when system-level calibration budget is limited and tighter factory R₂₅ spec improves first-pass yield
KT210	R₂₅ = 970–1030 Ω; TO-92 Mini package; τ_air = 11 s; lower cost for through-hole assembly	Better suited for prototyping or legacy through-hole designs where reflow compatibility is not required	Choose for manual assembly, low-volume test fixtures, or cost-sensitive non-automotive applications

Compared with KT230, KTY23-6 offers improved R₂₅ consistency for reduced calibration effort, while KT210 trades SMT compatibility and faster response for lower unit cost and through-hole ease - enabling optimal selection based on production method and accuracy target.

Availability

KT230 is available at Aetrix Electronics and suitable for motor protection, HVAC refrigerant monitoring, industrial power supply thermal sensing, and automotive battery pack cell monitoring requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for KT230 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 AEC-Q200 and ISO/TS 16949.

The KT-series belongs to Infineon's analog temperature sensor product line, engineered specifically for high-stability, wide-range PTC sensing in safety-critical thermal monitoring applications - not general-purpose NTC replacements.

FAQ

What is the maximum allowable bias current for KT230 without introducing significant self-heating error?

The KT230 must be operated at ≤5 mA DC to limit self-heating-induced temperature measurement error to <0.1 °C. At 1 mA nominal bias - recommended for precision applications - self-heating is negligible (<0.01 °C). Exceeding 5 mA risks exceeding absolute maximum ratings and accelerating long-term drift.

Can KT230 be used in place of an NTC thermistor in existing circuits?

No - KT230 is a PTC device with opposite resistance vs. temperature slope versus NTCs. Swapping requires redesign of signal conditioning (e.g., inverting amplifier gain, ADC reference scaling, and firmware sign handling). Its parabolic R-T curve also differs fundamentally from NTC exponential behavior.

Is KT230 AEC-Q200 qualified for automotive under-hood use?

Yes - KT230 is AEC-Q200 qualified and specified for operation from −50 °C to +150 °C. Its silicon die construction, SOT-23 package robustness, and long-term stability meet automotive reliability requirements for engine control, transmission, and battery thermal management subsystems.

How does the symmetrical two-terminal design affect PCB layout and ESD protection?

The symmetrical construction means no polarity assignment is needed - either terminal can connect to bias or ground. For ESD, a 10 nF ceramic capacitor placed in parallel with the sensor (per datasheet recommendation) suppresses induced voltage spikes on long traces, preventing damage from >25 V transients.

KT230 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

KT230 FAQ

1.How can I place an order for KT230 through Aetrix?

Please submit a Request for Quotation (RFQ) for KT230 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 KT230 reliable?

The price and inventory of KT230 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KT230 is usually 5 days.

3.What payment methods are accepted for KT230?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KT230 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KT230?

KT230 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KT230 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 KT230?

For technical support, including KT230 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KT230 requirements.

6.How does Aetrix verify that KT230 is sourced from the original manufacturer or authorized distributors?

All KT230 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 KT230 meets industry standards.

7.What is the process for return or replacement of KT230?

All KT230 units undergo pre-shipment inspection (PSI). If there is an issue with KT230, 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 KT230 part is unused and in its original packaging.

Return procedure for KT230:

1.Submit a request within 90 days.

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

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