Texas Instruments TMP6131DYAT

Overview

TMP6131DYAT from Texas Instruments is a silicon-based linear positive temperature coefficient (PTC) thermistor in a 0603 SOT-5X3 package, with 10-kΩ nominal resistance at 25°C (±1% tolerance over 0°C to 70°C), 6400 ppm/°C TCR at 25°C, and –40°C to +150°C operating range. It delivers fast thermal response (0.6 s in stirred liquid), built-in fail-safe behavior during short-circuit events, and 0.2% typical TCR tolerance across temperature - enabling accurate, low-complexity temperature sensing in motor control and charger thermal threshold detection.

For engineers reviewing the TMP6131DYAT datasheet, TMP6131DYAT pinout, TMP6131DYAT application, or TMP6131DYAT equivalent, key selection considerations include its linear R-T curve eliminating NTC linearization circuitry, minimal self-heating due to low thermal mass, ratiometric voltage-divider compatibility with ADC reference sharing, consistent sensitivity above 85°C, and fail-safe PTC behavior under overvoltage conditions.

Technical Context

The TMP6131DYAT operates as a two-terminal passive resistive sensor with polarized terminals: Pin 1 (–) must be at lower voltage potential than Pin 2 (+) to ensure proper PTC behavior and avoid measurement error. Its resistance varies linearly with temperature due to controlled silicon doping and active-area geometry, not inherent material nonlinearity.

Unlike NTC thermistors, the TMP6131DYAT's resistance increases with temperature, reducing bias current and self-heating at elevated temperatures - a feature critical for thermal foldback and overtemperature shutdown circuits. Its TCR remains stable (±0.2% typical) from –40°C to +150°C, and its 0.6 s thermal response time in stirred liquid reflects its small 1.60 mm × 0.80 mm SOT-5X3 package and low thermal mass.

Key Specifications

Pinout & Package

The TMP6131DYAT is housed in a 2-pin SOT-5X3 (DYA) surface-mount package measuring 1.60 mm × 0.80 mm, optimized for high-density PCB layouts and proximity to heat sources.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear PTC thermistor applications.

Compared with TMP6131DYAT, the DEC variant offers superior thermal coupling in space-constrained layouts but requires tighter placement control, while the LPG variant trades miniaturization for mechanical stability and ease of validation - all three share identical R-T linearity, TCR stability, and fail-safe behavior.

Availability

TMP6131DYAT is available at Aetrix Electronics and suitable for motor control thermal protection, charger overtemperature shutdown, and industrial appliance temperature monitoring requiring stable component supply, full traceability, and lifecycle continuity.

Supply support for TMP6131DYAT 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability components for industrial, automotive, and consumer systems.

The TMP61 series was designed specifically to replace nonlinear NTC thermistors in precision temperature sensing applications - delivering linear output, built-in fault resilience, and simplified signal conditioning across –40°C to +150°C.

FAQ

What is the maximum operating temperature of the TMP6131DYAT?

The TMP6131DYAT has a maximum operating temperature of +150°C, validated for continuous operation in the SOT-5X3 (DYA) package. This rating applies across its full specified current and voltage ranges, and is supported by long-term drift data showing only 0.2% resistance shift after 1000 hours at 150°C - making it suitable for demanding applications like motor windings and high-power chargers.

Does the TMP6131DYAT require linearization circuitry like traditional NTC thermistors?

No, the TMP6131DYAT does not require external linearization circuitry. Its silicon-based PTC structure delivers a highly linear resistance-vs-temperature curve (±0.2% TCR tolerance) across –40°C to +150°C. This allows direct use in voltage-divider or current-source configurations with simple polynomial or ratiometric conversion - eliminating parallel resistors, midpoint calibration, and large lookup tables needed for NTCs.

How is polarity handled on the TMP6131DYAT, and what happens if it is reversed?

The TMP6131DYAT has polarized terminals: Pin 1 is (–) and Pin 2 is (+). Proper operation requires Pin 2 to be at a higher voltage potential than Pin 1. Reversing polarity causes incorrect resistance interpretation, increased self-heating, and accelerated long-term drift - as confirmed in TI's functional description stating "connect the positive terminal to the highest voltage potential." The device will not function reliably outside this bias condition.

Can the TMP6131DYAT be used in a ratiometric voltage-divider configuration with an ADC?

Yes, the TMP6131DYAT is explicitly designed for ratiometric operation. When used in a voltage divider with a precision bias resistor and shared VBIAS/ADC reference, supply voltage tolerances cancel out - improving absolute temperature accuracy. TI's datasheet confirms this in Section 8.2.1.2, noting that Equation 4 demonstrates full cancellation of VBIAS when VREF = VBIAS, making it ideal for cost-sensitive, high-accuracy embedded systems.

What is the thermal response time of the TMP6131DYAT, and how is it measured?

The TMP6131DYAT has a thermal response time of 0.6 seconds to reach 63% of final resistance value when transitioning from 25°C still air to 125°C stirred liquid - per JEDEC-standard test conditions documented in Section 6.5. This metric reflects its 1.60 mm × 0.80 mm SOT-5X3 package's low thermal mass and is validated for the DYA variant; response in still air is 3.2 s, as shown in Figure 6-9.