Texas Instruments TMP6431QDYARQ1

Overview

TMP6431QDYARQ1 from Texas Instruments is an AEC-Q100 Grade 0 automotive linear silicon thermistor with positive temperature coefficient (PTC), 47-kΩ nominal resistance at 25 °C (±1% tolerance over 0 °C to 70 °C), 6400 ppm/°C TCR at 25 °C, and fast 0.6 s thermal response in stirred liquid. It operates from –40 °C to 150 °C and is used for precision thermal foldback in on-board chargers and motor control systems.

For engineers reviewing the TMP6431QDYARQ1 datasheet, TMP6431QDYARQ1 pinout, TMP6431QDYARQ1 application, or TMP6431QDYARQ1 equivalent, key selection considerations include its SOT-5X3 package compatibility with 0603 footprints, built-in short-circuit fail-safe behavior, ±0.14% typical long-term drift after 96 h at 130 °C/85% RH, and ratiometric voltage-divider operation with 5.5 V max bias voltage.

Technical Context

The TMP6431QDYARQ1 implements a monolithic silicon PTC structure where doping and active region geometry define both R25 and TCR. Its linear resistance vs. temperature curve eliminates need for external linearization circuitry or midpoint calibration-unlike NTC thermistors-and enables direct polynomial or LUT-based temperature conversion using digitized V_TEMP.

It operates exclusively in a single functional mode within recommended conditions: 0–5.5 V bias voltage, ≤100 µA sense current, and –40 °C to 150 °C ambient (SOT-5X3/DYA package). Self-heating is minimized by low power consumption and small thermal mass, and built-in fail-safe limits runaway during short-to-supply events via rising resistance under overtemperature stress.

Key Specifications

Pinout & Package

The TMP6431QDYARQ1 is housed in a 2-pin SOT-5X3 package (0.60 mm × 1.00 mm), footprint-compatible with industry-standard 0603 components. The package features exposed thermal pad for enhanced board-level heat dissipation and JEDEC-compliant solder reflow profile.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMP6411QDYARQ1 and TMP6431QDECRQ1, the TMP6431QDYARQ1 uniquely combines Grade 0 temperature rating, SOT-5X3 mechanical robustness, and lowest thermal resistance among 0603-compatible linear thermistors-making it optimal for high-reliability power electronics thermal protection where both speed and extended range are critical.

Availability

TMP6431QDYARQ1 is available at Aetrix Electronics and suitable for automotive powertrain control, on-board charger thermal management, and motor inverter foldback applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TMP6431QDYARQ1 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 and embedded processing technologies, with leadership in automotive-grade sensing, power management, and signal chain solutions.

The TMP64-Q1 product line delivers silicon-based linear PTC thermistors engineered for automotive thermal monitoring-designed to replace NTCs in safety-critical systems by eliminating calibration complexity, improving high-temperature sensitivity, and enabling intrinsic fail-safe behavior.

FAQ

What is the maximum operating temperature of the TMP6431QDYARQ1?

The TMP6431QDYARQ1 is rated for continuous operation from –40 °C to +150 °C, meeting AEC-Q100 Grade 0 specifications. This rating applies specifically to the SOT-5X3 (DYA) package variant and is validated under recommended bias conditions (≤5.5 V, ≤100 µA). Exceeding 150 °C ambient may cause irreversible parametric shift or accelerated long-term drift beyond the ±0.14% spec.

Does the TMP6431QDYARQ1 require external linearization circuitry?

No, the TMP6431QDYARQ1 does not require external linearization circuitry. Its silicon PTC structure provides inherently linear resistance vs. temperature behavior across –40 °C to +150 °C, with TCR stability of ±0.2% typical. This eliminates the need for parallel resistors, midpoint calibration, or complex polynomial fitting-unlike traditional NTC thermistors. The TMP6431QDYARQ1 supports direct ratiometric ADC interfacing or simple comparator-based threshold detection.

How does the built-in fail-safe mechanism work in the TMP6431QDYARQ1?

The TMP6431QDYARQ1's built-in fail-safe activates during short-to-supply faults: rising current increases self-heating, which-due to its positive temperature coefficient-causes resistance to increase. This inherently limits further current flow and prevents thermal runaway. In contrast, an NTC would decrease resistance under the same fault, creating destructive positive feedback. This behavior is intrinsic to the TMP6431QDYARQ1's silicon structure and requires no external components.

What is the thermal response time of the TMP6431QDYARQ1 in still air?

The TMP6431QDYARQ1 exhibits a thermal response time of 3.2 seconds to reach 63% of final resistance value when transitioning from 25 °C to 70 °C in still air. This value is measured per JEDEC JESD51-13 and reflects the device's low thermal mass and SOT-5X3 package construction. For faster response, forced airflow or liquid immersion reduces this to 0.6 s (stirred liquid, 25 °C → 125 °C).

Can the TMP6431QDYARQ1 be used with a 3.3 V microcontroller ADC?

Yes, the TMP6431QDYARQ1 is fully compatible with 3.3 V microcontroller ADCs. When configured in a voltage divider with a 47 kΩ bias resistor and 3.3 V bias supply, its output spans ~1.65 V across –40 °C to +150 °C-well within typical ADC input ranges. For best accuracy, tie the ADC reference voltage (V_REF) to the same 3.3 V rail used for biasing, enabling ratiometric cancellation of supply tolerance errors in the TMP6431QDYARQ1 measurement chain.