Infineon Technologies KTY13-6

Overview

KTY13-6 from Infineon Technologies is a silicon-based positive temperature coefficient (PTC) temperature sensor in SOT-23 package, designed for analog temperature sensing in automotive and industrial control loops. It exhibits R₂₅ = 1980 Ω (min) / 2020 Ω (max) at 25 °C, operates from −50 °C to +150 °C, and delivers linear resistance vs. temperature behavior with ±1% or ±3% tolerance options.

For engineers reviewing the KTY13-6 datasheet, KTY13-6 pinout, KTY13-6 application, or KTY13-6 equivalent, this device serves as a low-cost, polarity-independent, two-terminal analog temperature transducer requiring only a stable 1 mA bias current - ideal for engine coolant, HVAC duct, and motor winding temperature monitoring where long-term stability and fast thermal response are critical.

Technical Context

The KTY13-6 uses an n-conducting silicon planar chip whose resistance follows a second-order polynomial: R_T = R₂₅ × [1 + α·ΔT + β·(ΔT)²], with α = 7.88×10⁻³ K⁻¹ and β = 1.937×10⁻⁵ K⁻² over −30 °C to +130 °C. Its symmetrical two-terminal construction eliminates polarity concerns in PCB layout and biasing.

Thermal time constant is 7 s in air and 1 s in oil, enabling rapid detection of localized temperature changes. Absolute maximum ratings include 25 V operating voltage and 7 mA continuous operating current, with peak current up to 10 mA for ≤10 ms pulses.

Key Specifications

Pinout & Package

Two-terminal SOT-23 package (JEDEC TO-236AB); terminals are symmetrical and non-polarized. No internal die bonding asymmetry - Pin 1 and Pin 2 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 NTCG163JH103JT1 and KTY83-110, KTY13-6 offers faster thermal response (7 s vs. 40 s), SMT compatibility, and inherent linearity advantage over NTCs - making it optimal for compact, high-dynamics automotive and industrial sensing nodes.

Availability

KTY13-6 is available at Aetrix Electronics and suitable for engine management systems, HVAC control units, industrial motor drives, and power supply thermal monitoring requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for KTY13-6 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 AEC-Q200 and ISO/TS 16949.

The KTY-series was developed specifically for high-reliability analog temperature sensing in harsh environments - targeting automotive under-hood, industrial motor, and power electronics thermal management where silicon PTC stability outperforms thermistors and RTDs.

FAQ

What is the recommended bias current for KTY13-6?

The datasheet specifies 1 mA as the standard operating current for resistance measurement. At this level, self-heating remains below 0.1 °C error in still air. Higher currents (up to 7 mA max) are allowed but require thermal derating and PCB copper area consideration to avoid measurement drift.

Can KTY13-6 be used in a Wheatstone bridge configuration?

Yes - its two-terminal symmetry and stable TCR make it suitable as one arm of a bridge. However, because it lacks built-in reference elements, external precision resistors are required for balanced operation and common-mode rejection. Bridge excitation must remain within 25 V absolute max rating.

How is temperature calculated from KTY13-6 resistance?

Temperature is derived using the second-order equation: T = [−α + √(α² − 4β(1 − R_T/R₂₅))]/(2β), where α = 7.88×10⁻³ K⁻¹ and β = 1.937×10⁻⁵ K⁻². This formula is valid from −30 °C to +130 °C and achieves <±0.5 °C accuracy with calibrated R₂₅.

Does KTY13-6 require polarity-aware PCB layout?

No - the device has symmetrical construction with identical electrical behavior at both terminals. Pin 1 and Pin 2 are functionally interchangeable, eliminating orientation constraints during placement and reducing assembly defects in automated SMT lines.