Infineon Technologies KTY11-6

Overview

KTY11-6 from Infineon Technologies is a silicon-based positive temperature coefficient (PTC) temperature sensor in TO-92 Mini package, with nominal resistance R₂₅ = 1980 Ω ±3%, operating from −50 °C to +150 °C, linear output characteristic, and thermal time constant τ_air = 11 s - used for motor winding temperature monitoring in industrial drives.

For engineers reviewing the KTY11-6 datasheet, KTY11-6 pinout, KTY11-6 application, or KTY11-6 equivalent, this part serves as a precision analog temperature sensing element requiring minimal external circuitry, stable over long-term operation, and compatible with standard voltage-divider readout architectures in embedded thermal protection systems.

Technical Context

The KTY11-6 implements a planar n-conducting silicon crystal whose resistance follows a second-order polynomial function RT = R₂₅ × (1 + α·ΔT + β·ΔT²), where α = 7.88×10⁻³ K⁻¹ and β = 1.937×10⁻⁵ K⁻², valid from −30 °C to +130 °C.

Its symmetrical two-terminal construction eliminates polarity dependence, and it operates at 1 mA bias current with maximum 25 V DC supply voltage, delivering repeatable resistance values across its full −50 °C to +150 °C range without self-heating artifacts under specified conditions.

Key Specifications

Pinout & Package

Two-terminal device in TO-92 Mini plastic package (3.3 mm × 1.7 mm × 4.0 mm); symmetrical construction - no polarity; terminals are electrically identical and interchangeable.

Key Features

Applications

Equivalent & Alternatives

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

Compared with KTY11-5 and KTY11-7, the KTY11-6 offers the median R₂₅ value in the KTY11-x family - balancing voltage-divider linearity, self-heating margin, and compatibility with existing 2.0 kΩ reference designs across industrial motor control platforms.

Availability

KTY11-6 is available at Aetrix Electronics and suitable for motor protection, power supply thermal management, and industrial oven control requiring stable component supply across multi-year production cycles.

Supply support for KTY11-6 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, automotive ICs, and sensor solutions, with global manufacturing and quality certification to ISO/TS 16949 and IATF 16949.

The KTY-series was developed specifically for high-reliability analog temperature sensing in harsh environments - emphasizing long-term stability, wide operating range, and simplified interface requirements in industrial and automotive thermal monitoring.

FAQ

What is the recommended bias current for KTY11-6 to minimize self-heating error?

The datasheet specifies 1 mA as the standard operating current. At this level, self-heating remains below 0.1 °C in still air. Exceeding 2 mA increases thermal error beyond ±0.5 °C and risks exceeding the 5 mA absolute maximum rating. Use precision current sources or high-value pull-up resistors (>10 kΩ) to maintain accuracy.

Can KTY11-6 be used in liquid immersion applications?

Yes - its TO-92 Mini package is qualified for oil immersion with τ_oil = 1.5 s (typical). For water or coolant exposure, conformal coating or epoxy potting is required to prevent leakage currents and corrosion. Do not submerge uncoated units in conductive fluids.

How is temperature calculated from KTY11-6 resistance measurements?

Use the second-order equation: RT = R₂₅ × (1 + α·ΔT + β·ΔT²), with α = 7.88×10⁻³ K⁻¹ and β = 1.937×10⁻⁵ K⁻². Rearranged for temperature: T = [−α + √(α² − 4β(1 − RT/R₂₅))]/(2β) + 25 °C. This yields ±0.3 °C accuracy from −30 °C to +130 °C.

Does KTY11-6 require polarity-aware PCB layout?

No - its symmetrical two-terminal silicon structure makes it polarity-independent. Either terminal may connect to V_CC or GND in a voltage-divider configuration. This simplifies automated placement and eliminates orientation-related assembly defects.