Texas Instruments TMP6331QDECRQ1

Overview

TMP6331QDECRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive linear silicon thermistor with positive temperature coefficient (PTC), 100-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 - deployed for precision thermal monitoring in battery management systems and motor control.

For engineers reviewing the TMP6331QDECRQ1 datasheet, TMP6331QDECRQ1 pinout, TMP6331QDECRQ1 application, or TMP6331QDECRQ1 equivalent, key selection criteria include its linear PTC behavior eliminating NTC linearization circuitry, built-in fail-safe under short-circuit conditions, ±0.2% typical TCR tolerance across temperature, and compatibility with 0402 footprint layouts via X1SON (DEC) package.

Technical Context

The TMP6331QDECRQ1 operates as a two-terminal voltage- or current-biased resistive sensor with polarity-sensitive terminals (+ and –); its resistance increases linearly with temperature due to silicon-based PTC physics, enabling direct ratiometric ADC interfacing without lookup tables or polynomial compensation. It requires strict bias polarity: + terminal must be at higher potential than – terminal.

Its electrical behavior is defined by bias-dependent R–T characteristics - the Thermistor Design Tool must recalculate resistance vs. temperature tables when V_BIAS, I_BIAS, or R_BIAS changes. Self-heating effects are minimized by low power consumption (≤40 µA max operating current) and small thermal mass, yielding <0.3% typical long-term drift after 600 h at 150 °C.

Key Specifications

Pinout & Package

X1SON (DEC) 2-pin package, 0.60 mm × 1.00 mm body size, compatible with standard 0402 (inch) footprint - optimized for space-constrained automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMP6131QDECRQ1 and TMP6331QDQCRQ1, the TMP6331QDECRQ1 offers optimal balance of high-impedance signal integrity, 0402-compatible miniaturization, and Grade 1 automotive qualification - making it the preferred choice for space-constrained BMS and display thermal compensation where 100-kΩ baseline simplifies ADC scaling and noise immunity.

Availability

TMP6331QDECRQ1 is available at Aetrix Electronics and suitable for battery management systems, motor control inverters, and display backlight thermal compensation requiring stable component supply across automotive production lifecycles.

Supply support for TMP6331QDECRQ1 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 automotive-grade signal conditioning solutions, with decades of experience in high-reliability sensor design.

The TMP63-Q1 product line delivers automotive-qualified linear silicon thermistors to replace legacy NTCs - designed specifically for simplified thermal monitoring in EV power electronics, ADAS modules, and infotainment systems where linearity, fail-safe behavior, and long-term stability are critical.

FAQ

What is the maximum operating temperature of the TMP6331QDECRQ1?

The TMP6331QDECRQ1 is rated for AEC-Q100 Grade 1 operation, supporting continuous operation from –40 °C to +125 °C ambient temperature. Its junction temperature may reach up to +155 °C under absolute maximum conditions, but recommended operation stays within the Grade 1 range to ensure long-term reliability and specification compliance. The TMP6331QDECRQ1's thermal performance is validated for under-dash and powertrain applications meeting ISO 16750-4 requirements.

Does the TMP6331QDECRQ1 require external linearization circuitry?

No, the TMP6331QDECRQ1 does not require external linearization circuitry. Its silicon-based linear PTC characteristic provides a highly linear resistance-vs-temperature curve across –40 °C to +125 °C, with ±0.2% typical TCR tolerance. This eliminates the need for parallel linearization resistors (RP) or complex polynomial compensation used with NTC thermistors - simplifying both hardware design and firmware implementation for the TMP6331QDECRQ1.

How is the TMP6331QDECRQ1 protected against short-circuit failures?

The TMP6331QDECRQ1 features built-in fail-safe behavior: during a short-to-supply condition, rising temperature causes its PTC resistance to increase, inherently limiting current and preventing thermal runaway. Unlike NTCs - which decrease resistance under self-heating and enter destructive positive feedback - the TMP6331QDECRQ1's intrinsic physics provides passive overtemperature protection without external components.

What is the thermal response time of the TMP6331QDECRQ1 in air versus liquid?

The TMP6331QDECRQ1 achieves a 63% thermal response time of 0.6 seconds in stirred liquid and 3.2 seconds in still air (25 °C to 70 °C). These values are measured per JEDEC JESD51-13 and reflect its low thermal mass and X1SON package geometry. The faster liquid response makes the TMP6331QDECRQ1 ideal for immersion-sensing applications like coolant temperature monitoring in EV thermal management systems.

Can the TMP6331QDECRQ1 be used with a ratiometric ADC configuration?

Yes, the TMP6331QDECRQ1 is explicitly designed for ratiometric operation: when V_BIAS is tied to the ADC reference voltage (V_REF), supply tolerance errors cancel out in the voltage divider equation. This configuration enables high-accuracy temperature measurement using low-cost 10- to 12-bit ADCs without precision voltage references - a key advantage confirmed in the TMP6331QDECRQ1 datasheet Section 8.2.1.2.