Texas Instruments TMP6131QDYATQ1

Overview

TMP6131QDYATQ1 from Texas Instruments is an automotive-grade silicon linear PTC thermistor in a 0603 SOT-5X3 (DYA) package, delivering ±1% R25 tolerance at 25°C, 6400 ppm/°C TCR, and AEC-Q100 Grade 0 qualification for operation from –40°C to 150°C. It enables high-accuracy thermal monitoring in battery management systems, motor control, and on-board chargers without external linearization circuitry.

For engineers reviewing the TMP6131QDYATQ1 datasheet, TMP6131QDYATQ1 pinout, TMP6131QDYATQ1 application, or TMP6131QDYATQ1 equivalent, key selection considerations include its linear resistance vs. temperature behavior, built-in fail-safe short-circuit response, ratiometric voltage-divider compatibility, and automotive-grade reliability across –40°C to 150°C ambient.

Technical Context

The TMP6131QDYATQ1 implements a monolithic silicon PTC structure with precisely doped active region geometry to achieve stable 6400 ppm/°C TCR and <0.2% TCR tolerance over –40°C to 150°C. Its two-terminal architecture requires positive biasing (pin 2 at higher potential than pin 1) and exhibits minimal self-heating due to low thermal mass and 0.6 s thermal response time in stirred liquid.

Unlike NTC thermistors, it eliminates need for parallel linearization resistors or polynomial correction tables-its resistance changes linearly with temperature, enabling direct ADC-based temperature calculation using simple first-order equations or TI's Thermistor Design Tool-generated R-T tables.

Key Specifications

Pinout & Package

The TMP6131QDYATQ1 uses a 2-pin SOT-5X3 (DYA) surface-mount package measuring 1.60 mm × 0.80 mm, optimized for automated placement and thermal coupling to PCB copper.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMP6131QDECQ1 and TMP6131QLPGQ1, the TMP6131QDYATQ1 offers optimal balance of automotive-grade reliability, 0603 SMT manufacturability, and thermal performance-making it the preferred choice for production automotive electronics where automated assembly and thermal responsiveness are both critical.

Availability

TMP6131QDYATQ1 is available at Aetrix Electronics and suitable for battery management systems, motor control inverters, on-board chargers, and display thermal compensation requiring stable component supply across automotive production lifecycles.

Supply support for TMP6131QDYATQ1 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 company specializing in analog, embedded processing, and automotive electronics, with leadership in precision sensing and power management solutions.

The TMP61-Q1 product line was designed specifically for automotive thermal sensing applications demanding AEC-Q100 compliance, linear output, and fail-safe behavior-replacing legacy NTCs in safety-critical systems like EV powertrain and charging infrastructure.

FAQ

What is the maximum operating temperature rating for TMP6131QDYATQ1?

The TMP6131QDYATQ1 is qualified to AEC-Q100 Grade 0 with continuous operation up to +150°C ambient temperature. This rating is validated via HTOL testing at 160°C for 2300 hours and HTSL at 175°C for 24 hours. The device maintains ±1% R25 tolerance and stable 6400 ppm/°C TCR across this full range, making TMP6131QDYATQ1 suitable for under-hood and powertrain thermal monitoring where extreme ambient conditions occur.

Does TMP6131QDYATQ1 require external linearization circuitry?

No, TMP6131QDYATQ1 does not require external linearization circuitry. Its silicon-based PTC structure provides inherently linear resistance vs. temperature behavior across –40°C to 150°C, eliminating the need for parallel resistors or complex polynomial correction used with NTC thermistors. Engineers can implement simple voltage-divider or current-source biasing and use first-order equations or TI's Thermistor Design Tool-generated R-T tables-reducing firmware overhead and BOM cost while maintaining <±0.5°C accuracy in typical applications.

How is the pinout configured for proper biasing of TMP6131QDYATQ1?

TMP6131QDYATQ1 has a strict polarity requirement: pin 1 is the (–) terminal and pin 2 is the (+) terminal. For correct operation, pin 2 must be held at a higher voltage potential than pin 1-typically achieved by connecting pin 2 to VBIAS or the top resistor in a voltage divider, and pin 1 to ground or the bottom node. Reversing polarity causes non-linear behavior and invalidates TCR specifications. The DYA package marking dot identifies pin 1, and the device must be mounted with correct orientation during SMT assembly to ensure reliable TMP6131QDYATQ1 performance.

What is the thermal response time of TMP6131QDYATQ1 and how is it measured?

The TMP6131QDYATQ1 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. This value is measured per JEDEC JESD51-13 methodology using calibrated fluid immersion. In still air, response slows to 3.2 s (63% from 25°C to 70°C). The fast liquid response enables real-time thermal protection in liquid-cooled power electronics, while the still-air value informs placement decisions near convection-cooled components. All TMP6131QDYATQ1 units meet this spec as part of AEC-Q200 qualification.

Can TMP6131QDYATQ1 be used in ratiometric ADC configurations?

Yes, TMP6131QDYATQ1 is explicitly designed for ratiometric ADC operation. When used in a voltage-divider configuration with VBIAS tied to the ADC's reference voltage (VREF), supply voltage tolerances cancel out-eliminating a major source of measurement error. Equation 4 in the datasheet confirms this cancellation mathematically. This ratiometric mode enables <±0.3°C accuracy using standard 12-bit ADCs without precision voltage references, reducing system cost and complexity. The TMP6131QDYATQ1's linear output further simplifies scaling and calibration in such configurations.