NXP Semiconductors KTY83/120,113

Overview

KTY83/120,113 from NXP Semiconductors is a silicon-based positive temperature coefficient (PTC) temperature sensor in SOD68 (DO-34) axial-leaded glass package, delivering 980–1020 Ω resistance at 25 °C with ±1.31 K max temperature error and 0.76 %/K nominal temperature coefficient. It operates from −55 °C to +175 °C and supports continuous sensing current up to 10 mA at 25 °C, used in motor winding temperature monitoring and HVAC thermal protection circuits.

For engineers reviewing the KTY83/120,113 datasheet, KTY83/120,113 pinout, KTY83/120,113 application, or KTY83/120,113 equivalent, this page provides verified resistance vs. temperature data, thermal time constant behavior in air/liquid, fail-safe PTC response, long-term drift specification (≤1 Ω after 10,000 h at 175 °C), and direct comparison to KTY83/110 and KTY83/121 variants for precision analog temperature sensing designs.

Technical Context

The KTY83/120,113 functions as a two-terminal passive resistive sensor with linearized PTC response over −55 °C to +175 °C, requiring external bias current (typically 1 mA) to convert resistance change into measurable voltage. Its silicon die exhibits virtually linear R–T characteristics, enabling direct analog-to-temperature conversion without complex linearization circuitry.

Thermal response is defined by three distinct thermal time constants: ≤20 s in still air, ≤1 s in still liquid, and ≤0.5 s in flowing liquid-making it suitable for both slow ambient monitoring and fast-response fluid temperature detection. The device's fail-safe behavior arises from its inherent PTC nature: resistance increases monotonically with temperature, preventing undetected open-circuit failure modes common in NTC thermistors.

Key Specifications

Pinout & Package

Package: SOD68 (DO-34) hermetically sealed glass axial-leaded package, 3.04 mm max body diameter, 25.4 mm min lead length, 0.55 mm max lead diameter.

Key Features

Applications

Equivalent & Alternatives

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

Compared with KTY83/110, the KTY83/120,113 offers lower low-temperature error (±4.11 K vs. ±3.08 K at −55 °C) and wider R₂₅ tolerance for cost-sensitive designs; versus KTY83/121, it shares identical R₁₀₀/R₂₅ and thermal time constants but differs in factory resistance binning and marking code (KT83C).

Availability

KTY83/120,113 is available at Aetrix Electronics and suitable for motor winding protection, HVAC heat exchanger monitoring, and power transformer hot-spot sensing requiring stable component supply across extended temperature ranges and long service life.

Supply support for KTY83/120,113 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The KTY83 series belongs to NXP's analog sensor product line, designed specifically for high-reliability, wide-temperature-range resistive temperature sensing in safety-critical thermal protection systems.

FAQ

What is the recommended operating current for KTY83/120,113 to minimize self-heating error?

The KTY83/120,113 is specified for 1 mA continuous sensing current to maintain temperature error within ±0.1 K due to self-heating. At this bias, resistance drift remains below 1 Ω after 10,000 h at 175 °C. Higher currents (up to 10 mA) are allowed only at 25 °C ambient, but cause measurable self-heating above 2 mA in enclosed environments. For precision applications, always use 1 mA with Kelvin-sense or ratiometric ADC referencing to eliminate lead resistance effects in the KTY83/120,113 measurement path.

How does KTY83/120,113 differ from NTC thermistors in system-level reliability?

The KTY83/120,113 uses a silicon PTC structure that inherently increases resistance with rising temperature, providing fail-safe behavior: if the sensor opens or degrades, resistance rises sharply, triggering overtemperature alarms rather than failing silently. In contrast, NTC thermistors decrease resistance with temperature and may fail shorted, masking overtemperature conditions. This makes the KTY83/120,113 preferred for ISO 26262-compliant thermal shutdown circuits where diagnostic coverage must exceed 90%. Its hermetic glass package further enhances reliability in humid or chemically aggressive environments compared to epoxy-coated NTCs.

Can KTY83/120,113 be used directly with a microcontroller's ADC without signal conditioning?

Yes, the KTY83/120,113 can interface directly with most microcontroller ADCs using a simple voltage divider: one resistor (e.g., 1 kΩ) and the KTY83/120,113 as the second leg. With 1 mA bias, its 980–1020 Ω R₂₅ yields ~1 V output at 3.3 V supply, fitting within standard ADC input ranges. However, for ±0.5 K accuracy, add a 0.1 µF ceramic capacitor across the KTY83/120,113 terminals to suppress EMI, and perform two-point calibration at 25 °C and 100 °C using the published R₁₀₀/R₂₅ = 1.65–1.69 ratio. No op-amp buffering is needed unless cable runs exceed 10 cm.

What is the thermal time constant of KTY83/120,113 in flowing engine coolant?

The KTY83/120,113 has a thermal time constant of ≤0.5 s in flowing liquid, as confirmed in Table 6 of the NXP datasheet under "in flowing liquid" condition. This value applies directly to engine coolant at typical automotive flow rates (>1 m/s), enabling the KTY83/120,113 to track rapid coolant temperature transients during cold starts or throttle transitions. For validation, mount the SOD68 package with minimal epoxy encapsulation to ensure direct thermal contact; avoid potting compounds with low thermal conductivity, which can increase effective time constant beyond 0.5 s. The KTY83/120,113's glass body ensures no chemical degradation in ethylene-glycol coolant mixtures.

Is KTY83/120,113 RoHS compliant and halogen-free?

Yes, the KTY83/120,113 is RoHS compliant (2011/65/EU) and halogen-free, as documented in NXP's official compliance statements for the KTY83 series. The SOD68 glass package contains no lead in the solder seal, and the axial leads are matte tin-plated copper. Material Declaration Sheets (MDS) confirm <900 ppm bromine and <900 ppm chlorine content, satisfying IPC-4101D requirements for halogen-free PCB assembly. This allows the KTY83/120,113 to be used in consumer, industrial, and automotive applications requiring full substance compliance reporting without restriction.