Texas Instruments TMP6131QDECRQ1

Overview

TMP6131QDECRQ1 from Texas Instruments is an AEC-Q100 qualified silicon-based linear PTC thermistor in X1SON (DEC) 0402-compatible package, delivering 10 kΩ nominal resistance at 25°C (±1% tolerance), +6400 ppm/°C TCR at 25°C, and ±0.2% typical TCR tolerance across –40°C to +125°C. It enables high-accuracy temperature sensing in automotive battery management systems and DC/DC converters without external linearization circuitry.

For engineers reviewing the TMP6131QDECRQ1 datasheet, TMP6131QDECRQ1 pinout, TMP6131QDECRQ1 application, or TMP6131QDECRQ1 equivalent, this page provides verified technical context, real-world implementation constraints, thermal response behavior, and validated alternative options for automotive-grade thermal monitoring designs.

Technical Context

The TMP6131QDECRQ1 operates as a two-terminal passive resistive sensor with strictly unidirectional biasing: Pin 2 (+) must be held at higher potential than Pin 1 (–) to ensure proper substrate polarization and avoid measurement drift. Its linear PTC behavior stems from controlled silicon doping, yielding consistent ΔR/ΔT of ~63–102 Ω/°C across –40°C to +125°C and <0.8% long-term drift after 96h @130°C/85% RH.

It supports both ratiometric voltage-divider biasing (with 10 kΩ ±0.01% RBias) and precision current-source excitation (up to 400 µA), enabling direct VTEMP-to-temperature conversion via polynomial fit or LUT-eliminating need for NTC-style Steinhart-Hart equations or parallel linearization resistors.

Key Specifications

Pinout & Package

X1SON (DEC) 2-pin surface-mount package, 0.60 mm × 1.00 mm body size, compatible with industry-standard 0402 footprint. No exposed pad; thermal path relies on PCB copper area and vias per JESD51-7 High-K board simulation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMP6131QDECRQ1, NTCG164BF103FT1 demands additional hardware linearization and firmware complexity, while TSYS02D removes analog design burden but introduces communication overhead and supply voltage constraints-making TMP6131QDECRQ1 optimal for cost-sensitive, high-speed analog thermal monitoring in AEC-Q100 systems.

Availability

TMP6131QDECRQ1 is available at Aetrix Electronics and suitable for battery management systems, on-board chargers, and automotive lighting requiring stable component supply with automotive-grade traceability and lifecycle continuity.

Supply support for TMP6131QDECRQ1 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 ICs, with decades of leadership in precision sensing and automotive qualification.

The TMP61-Q1 product line was designed specifically for AEC-Q100-compliant automotive thermal sensing-replacing legacy NTCs with linear silicon PTC devices that simplify signal conditioning and improve accuracy across wide temperature ranges.

FAQ

What is the correct biasing polarity for TMP6131QDECRQ1?

The TMP6131QDECRQ1 requires strict unidirectional biasing: Pin 2 (+) must be at a higher voltage potential than Pin 1 (–). Reversing polarity connects the internal substrate to the higher potential, causing leakage current, measurement drift, and accelerated long-term degradation. Always verify polarity during layout and test.

Does TMP6131QDECRQ1 require external linearization circuitry?

No. The TMP6131QDECRQ1's inherent linear PTC resistance vs. temperature behavior eliminates the need for parallel linearization resistors or complex Steinhart-Hart computation. A simple voltage divider or current-source bias delivers direct linear VTEMP output-reducing BOM count and firmware overhead compared to NTC solutions.

What is the maximum allowable sense current for TMP6131QDECRQ1?

The absolute maximum sense current for TMP6131QDECRQ1 is 450 µA, but the recommended operating limit is 400 µA. At 400 µA, self-heating remains below 0.1°C at 25°C ambient-critical for high-accuracy applications like battery cell monitoring where thermal offset directly impacts safety margins.

How does TMP6131QDECRQ1 achieve AEC-Q100 qualification?

The TMP6131QDECRQ1 achieves AEC-Q100 Grade 1 qualification through rigorous stress testing including 96h @130°C/85% RH (≤0.8% resistance drift), HBM ±2000 V ESD, and full characterization from –40°C to +125°C. Its monolithic silicon construction and substrate-controlled terminal architecture ensure robustness in automotive under-hood environments.

Can TMP6131QDECRQ1 be used in thermal protection circuits with comparators?

Yes. The TMP6131QDECRQ1 is commonly used in comparator-based thermal switches: its linear VTEMP output (e.g., ~2.5 V at 25°C rising to ~4.2 V at 100°C with 5 V bias) provides predictable trip-point thresholds. Combined with hysteresis resistors, it delivers reliable overtemperature shutdown in DC/DC converters and motor drivers without software intervention.