Infineon Technologies KTY10-7

Overview

KTY10-7 from Infineon Technologies is a silicon-based positive temperature coefficient (PTC) temperature sensor in TO-92 package, designed for analog temperature sensing in air/gas/liquid media. It exhibits R₂₅ = 2010–2050 Ω at 25 °C, operates from −50 °C to +150 °C, and delivers linearized resistance output with ±3% R₂₅ tolerance-used in motor winding overtemperature protection and HVAC refrigerant line monitoring.

For engineers reviewing the KTY10-7 datasheet, KTY10-7 pinout, KTY10-7 application, or KTY10-7 equivalent, this page provides verified electrical characteristics, thermal time constants, resistance-temperature coefficients, package dimensions, and direct alternatives for industrial temperature feedback loops requiring stable PTC response and long-term drift <0.5% over 10 years.

Technical Context

The KTY10-7 implements a planar n-conducting silicon crystal element whose resistance follows a second-order polynomial function RT = R₂₅ × [1 + α·ΔT + β·(ΔT)²], where α = 7.88×10⁻³ K⁻¹ and β = 1.937×10⁻⁵ K⁻². Its curvature enables accurate temperature calculation from measured resistance across −30 °C to +130 °C.

It requires 1 mA operating current (I_op) for nominal characterization, supports ≤25 V DC bias, and exhibits τ_air = 40 s and τ_oil = 4 s thermal response-optimized for slow-to-medium transient environments like transformer oil baths or sealed motor housings.

Key Specifications

Pinout & Package

TO-92 package: axial-leaded, 3-pin plastic case with symmetrical construction-no polarity; pins are interchangeable (Pin 1 ≡ Pin 2 electrically per datasheet note).

Key Features

Applications

Equivalent & Alternatives

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

Compared with KTY10-6 and KTY11-7, KTY10-7 offers the highest R₂₅ in the KTY10-x series-improving SNR in high-impedance ADC interfaces-while retaining full compatibility with legacy TO-92 footprints and thermal models used in motor protection standards.

Availability

KTY10-7 is available at Aetrix Electronics and suitable for motor winding protection, HVAC refrigerant line monitoring, transformer oil bath sensing, and industrial oven air temperature feedback requiring stable component supply across extended product lifecycles.

Supply support for KTY10-7 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 IATF 16949.

The KTY-series was developed specifically for industrial and automotive thermal monitoring where long-term stability, wide temperature range, and analog interface simplicity outweigh digital bus complexity-targeting cost-sensitive, high-reliability analog temperature feedback loops.

FAQ

What is the maximum permissible operating voltage for KTY10-7?

KTY10-7 has an absolute maximum operating voltage of 25 V DC at ambient temperatures ≤25 °C and pulse duration ≤10 ms. Continuous operation above 15 V is discouraged due to increased self-heating risk; typical bias uses 5 V or 3.3 V with series current-limiting resistor to maintain I_op = 1 mA.

Can KTY10-7 be used in liquid immersion without encapsulation?

Yes-KTY10-7's TO-92 epoxy package is rated for direct immersion in transformer oil and non-corrosive coolants per Infineon's qualification testing. It must not be exposed to water, steam, or acidic/alkaline fluids; for aqueous environments, conformal coating or stainless-steel probe housing is required.

How is temperature calculated from KTY10-7 resistance measurements?

Temperature is derived using the second-order equation T_A = [−α + √(α² − 4β + 4β·(R_T/R₂₅))]/(2β), where R_T is measured resistance, R₂₅ = 2030 Ω (midpoint), α = 7.88×10⁻³ K⁻¹, and β = 1.937×10⁻⁵ K⁻². Lookup tables or polynomial interpolation in firmware yield ±0.4 °C accuracy from −30 °C to +130 °C.

Does KTY10-7 require external calibration for precision applications?

KTY10-7 achieves ±1.2 °C system accuracy after single-point (25 °C) calibration due to its tight R₂₅ tolerance (±3%) and predictable α/β coefficients. For ±0.5 °C performance, two-point calibration (e.g., at 25 °C and 100 °C) is recommended to correct residual parabolic deviation in the target operating range.