NXP Semiconductors KTY84/151,113

Overview

KTY84/151,113 from NXP Semiconductors is a silicon-based positive temperature coefficient (PTC) temperature sensor in SOD68 (DO-34) axial package, delivering 950 Ω to 1000 Ω resistance at 100 °C with ±4.19 K max temperature error, 0.61 %/K nominal temperature coefficient, and operation from −40 °C to +300 °C - used for precision thermal monitoring in motor windings, power supply thermal cutoffs, and industrial heating systems.

For engineers reviewing the KTY84/151,113 datasheet, KTY84/151,113 pinout, KTY84/151,113 application, or KTY84/151,113 equivalent, this page provides verified resistance vs. temperature data, thermal time constants in air/liquid, continuous current limits per ambient, fail-safe PTC behavior, and direct substitution guidance against functionally aligned silicon temperature sensors.

Technical Context

The KTY84/151,113 operates as a two-terminal passive resistive sensor requiring external bias current (typically 2 mA) to generate voltage proportional to temperature. Its PTC response is intrinsically linear over −40 °C to +150 °C (±0.61 %/K), with resistance ratio R250/R100 = 2.111–2.221 confirming predictable high-temperature scaling.

Thermal response is defined by environment: 20 s in still air, 1 s in still liquid, and 0.5 s in flowing liquid - enabling selection based on thermal mass and fluid dynamics of the target system. Maximum continuous current drops from 10 mA at 25 °C to 2 mA at 300 °C to prevent self-heating-induced measurement drift.

Key Specifications

Pinout & Package

Package: SOD68 (DO-34) - hermetically sealed glass axial-leaded package with nickel-plated leads, 3.04 mm max body diameter, 25.4 mm min lead length, suitable for through-hole mounting and high-reliability thermal interfaces.

Key Features

Applications

Equivalent & Alternatives

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

Compared with KTY84/151,113, the KTY84/150 trades ±4.19 K accuracy for broader R₁₀₀ tolerance and lower cost, while the TSI302-100 improves accuracy to ±2.5 K but sacrifices 100 °C of operational range - making KTY84/151,113 optimal for industrial systems demanding both high-temperature capability and calibrated precision.

Availability

KTY84/151,113 is available at Aetrix Electronics and suitable for motor winding protection, power supply thermal cutoffs, and industrial oven control requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for KTY84/151,113 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 KTY84 series belongs to NXP's analog sensor portfolio, designed specifically for high-reliability, wide-range thermal monitoring in harsh environments where fail-safe PTC behavior and long-term stability are mandatory.

FAQ

What is the maximum continuous sensor current for KTY84/151,113 at 300 °C?

The maximum continuous sensor current for KTY84/151,113 is 2 mA at 300 °C, as specified in Table 5 of the NXP datasheet. This limit prevents excessive self-heating that would introduce >0.5 K measurement error. At 25 °C, the rating rises to 10 mA, allowing higher signal-to-noise ratio in cooler environments. Always use constant-current biasing to maintain accuracy across the full −40 °C to +300 °C range.

How does the resistance of KTY84/151,113 change between 25 °C and 100 °C?

KTY84/151,113 exhibits an R25/R100 resistance ratio of 0.595–0.611, meaning its resistance at 25 °C is approximately 60 % of its resistance at 100 °C. For example, if R100 = 975 Ω (typical), R25 ≈ 590 Ω. This predictable ratio enables accurate cold-junction compensation and linearization in analog signal chains without factory calibration per unit.

Is KTY84/151,113 compatible with standard DO-34 footprint layouts?

Yes, KTY84/151,113 uses the standardized SOD68 (DO-34) package with 25.4 mm minimum lead length and 3.04 mm maximum body diameter, matching IPC-7351B DO-34 land pattern requirements. Its axial lead configuration supports both manual and automated through-hole insertion, and nickel-plated leads ensure consistent solder joint formation across wave and selective soldering processes.

What is the thermal time constant of KTY84/151,113 in flowing liquid?

The thermal time constant of KTY84/151,113 in flowing liquid is 0.5 seconds, per Table 6 of the NXP datasheet. This rapid response enables real-time thermal monitoring in coolant loops, transformer oil systems, or hydraulic fluid paths where dynamic temperature changes must be captured without lag. In still air, the same device requires 20 seconds - highlighting the critical impact of medium convection on measurement bandwidth.

Does KTY84/151,113 require polarity-aware circuit design?

Yes, KTY84/151,113 has defined anode (pin 2) and cathode (pin 1) terminals, as shown in Figure 2 and Table 2 of the datasheet. While it functions as a bidirectional resistor, correct polarity ensures consistent biasing in series-connected configurations and avoids confusion during PCB layout and test fixture design. Reversal does not damage the device but may affect repeatability in multi-sensor arrays sharing common return paths.