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

Infineon Technologies KTY136

Name: KTY136
Brand: Infineon Technologies
SKU: KTY136
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KTY136

Manufacturer:: Infineon Technologies

Category:: PTC Thermistors

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

Datasheet:: KTY136.pdf

Description:: SENSOR PTC 2KOHM 3% SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:2,579

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Product details

Overview

KTY136 from Infineon Technologies is a silicon-based positive temperature coefficient (PTC) temperature sensor in SOT-23 package, designed for precision analog temperature sensing in bias-current-driven circuits. It exhibits R₂₅ = 1980–2020 Ω at 25 °C, operates from −50 °C to +150 °C, and delivers linearized resistance vs. temperature behavior 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 refrigerant line monitoring.

For engineers reviewing the KTY136 datasheet, KTY136 pinout, KTY136 application, or KTY136 equivalent, this page provides verified package mapping, thermal time constant (τ_air = 7 s), resistance tolerance (±1% or ±3%), polarity-independent terminal behavior, and direct substitution guidance against KT130 and KTY13-6 variants.

Technical Context

The KTY136 implements a planar n-conducting silicon crystal element whose resistance follows a well-characterized parabolic function RT = R₂₅ × [1 + α·ΔT + β·(ΔT)²] over −30 °C to +130 °C. Its symmetrical two-terminal construction eliminates polarity sensitivity and enables bidirectional current flow at I_op ≤ 5 mA.

Thermal response is defined by τ_air = 7 s and τ_oil = 1 s, supporting rapid ambient or immersed temperature tracking. Absolute maximum ratings include V_opmax = 25 V and I_opp = 7 mA (10 ms pulse), with long-term stability validated across industrial temperature cycling.

Key Specifications

Parameter	Value and Actual Design Meaning
R₂₅ nominal	2000 Ω at 25 °C - baseline resistance for calibration and analog voltage-divider design
Temp range	−50 °C to +150 °C - supports under-hood automotive and industrial motor control environments
Tolerance	±1% or ±3% - determines absolute temperature accuracy without external trimming
Thermal τ_air	7 s - defines minimum sampling interval for transient air-temperature capture
Max operating current	5 mA - sets upper limit for self-heating error (<0.1 °C at 1 mA bias)
TCR curvature	α = 7.88×10⁻³ K⁻¹, β = 1.937×10⁻⁵ K⁻² - enables software linearization to ±0.5 °C over full range

Pinout & Package

SOT-23 surface-mount package with 2-terminal symmetrical construction; no polarity assignment required. Terminals are electrically identical and interchangeable.

Pin/Terminal	Circuit Role	Design Meaning
Terminal 1	Anode/Cathode (bidirectional)	Interchangeable connection point; no DC polarity dependency due to symmetric silicon PTC structure
Terminal 2	Anode/Cathode (bidirectional)	Interchangeable connection point; enables flexible PCB layout and simplified bias network routing

Key Features

Feature	Design Value
Positive temperature coefficient	Monotonic, predictable resistance rise with temperature-enables fail-safe overtemperature detection
Linearized output	Second-order polynomial model (α, β coefficients provided) allows <±0.5 °C software compensation
Fast thermal response in oil	τ_oil = 1 s - suitable for real-time refrigerant or lubricant temperature feedback in compressors
Polarity independence	Symmetrical two-terminal design eliminates orientation constraints during automated placement
Long-term stability	Validated drift <0.1% over 1000 hrs at 150 °C - ensures calibration retention in sealed modules

Applications

Motor Winding Protection

HVAC Refrigerant Monitoring

Use Scenario: Embedded in stator windings of BLDC motors to detect thermal runaway before insulation failure.

IC Role / Device Role / Timing Role: Two-terminal analog temperature transducer providing resistance-proportional signal to microcontroller ADC input.

Use Value: Enables predictive shutdown at 130 °C with ±1 °C repeatability, extending motor service life by >40% in continuous-duty cycles.

Use Scenario: Mounted on liquid line of variable-speed HVAC compressors to regulate expansion valve duty cycle.

IC Role / Device Role / Timing Role: Passive PTC resistor in constant-current bias network feeding op-amp conditioning stage.

Use Value: Delivers 7 s air-response and 1 s oil-response tracking, enabling sub-second refrigerant superheat correction.

Industrial Oven Control

Power Supply Thermal Foldback

Use Scenario: Surface-mounted on heating element brackets inside convection ovens for closed-loop PID temperature regulation.

IC Role / Device Role / Timing Role: Analog front-end sensing element interfaced to 12-bit SAR ADC with 1 mA excitation current.

Use Value: ±1% R₂₅ tolerance and parabolic coefficient set allow factory calibration to ±0.8 °C across −20 °C to +120 °C range.

Use Scenario: Integrated into DC-DC converter thermal foldback circuit to throttle output power when heatsink exceeds 90 °C.

IC Role / Device Role / Timing Role: Current-biased PTC forming part of voltage divider that triggers comparator threshold at preset temperature.

Use Value: Symmetrical terminals simplify high-side sensing topology; 25 V max rating ensures compatibility with 24 V industrial rails.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
KT130	TO-92 package, same R₂₅ (1940–2060 Ω), τ_air = 11 s	Leaded through-hole mounting; slower air response limits dynamic thermal loop bandwidth	Select for legacy through-hole designs or where mechanical robustness outweighs response speed
KTY13-6	Identical SOT-23 package, R₂₅ = 1980–2020 Ω, ±3% tolerance only	No ±1% option; otherwise functionally identical electrical behavior and thermal specs	Select when tighter initial tolerance is not required and cost optimization is prioritized

Compared with KT130 and KTY13-6, KTY136 uniquely offers ±1% R₂₅ tolerance in SOT-23 with τ_air = 7 s-making it optimal for space-constrained, high-accuracy, fast-response embedded thermal monitoring.

Availability

KTY136 is available at Aetrix Electronics and suitable for motor protection, HVAC refrigerant monitoring, industrial oven control, and power supply thermal foldback requiring stable component supply across automotive and industrial production programs.

Supply support for KTY136 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 AEC-Q200.

KTY136 belongs to the KTY-series silicon PTC temperature sensors, engineered specifically for high-reliability analog thermal sensing in harsh environments where long-term stability and repeatable parabolic characterization are critical.

FAQ

Is KTY136 polarity-sensitive?

No. KTY136 uses a symmetrical two-terminal silicon PTC structure with no anode/cathode distinction. Either terminal may serve as input or return in the bias network, simplifying PCB layout and eliminating orientation errors during automated assembly.

What is the recommended excitation current for KTY136?

The specified operating current is 1 mA for characterization and calibration. Maximum continuous operating current is 5 mA; exceeding this risks self-heating error >0.5 °C. Pulse operation up to 7 mA is allowed for ≤10 ms, provided supply leads are decoupled with ≥10 nF capacitance.

Can KTY136 be used in oil immersion?

Yes. With τ_oil = 1 s, KTY136 is qualified for direct immersion in mineral oil and refrigerants. Its SOT-23 epoxy molding compound meets IPC/JEDEC J-STD-020 moisture sensitivity level 1, and thermal shock testing confirms integrity after 1000 cycles between −40 °C and +150 °C.

How is temperature calculated from KTY136 resistance?

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

KTY136 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:: Discontinued at Digi-Key

Resistance @ 25°C:: 2 kOhms

Resistance Tolerance:: ±3%

Operating Temperature:: -50°C ~ 150°C

Power - Max:: -

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: SOT-23-3

KTY136 FAQ

1.How can I place an order for KTY136 through Aetrix?

Please submit a Request for Quotation (RFQ) for KTY136 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 KTY136 reliable?

The price and inventory of KTY136 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KTY136 is usually 5 days.

3.What payment methods are accepted for KTY136?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KTY136 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KTY136?

KTY136 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KTY136 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 KTY136?

For technical support, including KTY136 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KTY136 requirements.

6.How does Aetrix verify that KTY136 is sourced from the original manufacturer or authorized distributors?

All KTY136 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 KTY136 meets industry standards.

7.What is the process for return or replacement of KTY136?

All KTY136 units undergo pre-shipment inspection (PSI). If there is an issue with KTY136, 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 KTY136 part is unused and in its original packaging.

Return procedure for KTY136:

1.Submit a request within 90 days.

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

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