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Texas Instruments TMP6431QDECRQ1
- Part No.:
- TMP6431QDECRQ1
- Manufacturer:
- Texas Instruments
- Category:
- PTC Thermistors
- Package:
- 0402 (1006 Metric)
- Datasheet:
-
TMP6431QDECRQ1.pdf
- Description:
- SENSOR PTC 47KOHM 1% X1SON
- Quantity:
- Payment:
- Shipping:
Inventory:9,610
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Product details
Overview
TMP6431QDECRQ1 from Texas Instruments is an AEC-Q100 Grade 1 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 125 °C in the X1SON (DEC) 0402-compatible package and is used for precision thermal monitoring in battery management systems and motor control.
For engineers reviewing the TMP6431QDECRQ1 datasheet, TMP6431QDECRQ1 pinout, TMP6431QDECRQ1 application, or TMP6431QDECRQ1 equivalent, this page delivers verified electrical parameters, automotive-grade reliability data, package-specific thermal metrics, and real-world implementation guidance for ratiometric voltage-divider and current-source biasing circuits.
Technical Context
The TMP6431QDECRQ1 implements a silicon-based PTC structure with linear resistance vs. temperature behavior across –40 °C to 125 °C, eliminating need for external linearization circuitry. Its resistance changes uniformly with temperature, enabling direct polynomial or lookup-table conversion without midpoint calibration.
It operates as a two-terminal passive sensing element requiring external bias-either fixed voltage (up to 5.5 V) or precision current (up to 100 µA)-and exhibits built-in fail-safe behavior during short-to-supply events due to self-limiting resistance increase under overtemperature conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| R25 | 47 kΩ ±1% (0 °C to 70 °C); enables accurate baseline calibration with minimal initial error budget impact |
| TCR at 25 °C | +6400 ppm/°C ±0.2%; ensures consistent sensitivity across operating range for stable gain in analog front-ends |
| Thermal Response (stirred liquid) | 0.6 s to 63% ΔT; supports rapid thermal event detection in high-dynamic systems like on-board chargers |
| Max Operating Voltage | 6 V absolute maximum; allows safe operation with common 5.5 V bias rails and margin for transients |
| Long-Term Drift | ±0.5% typical after 600 h at 150 °C (DEC package); guarantees stability in under-hood applications over vehicle lifetime |
| AEC-Q100 Grade | Grade 1 (–40 °C to 125 °C); certified for powertrain and chassis modules requiring extended temperature reliability |
| Junction Temp Limit | 155 °C; supports design margin above max ambient in sealed enclosures or high-power density layouts |
Pinout & Package
The TMP6431QDECRQ1 is housed in a 2-pin X1SON package (0.60 mm × 1.00 mm), footprint-compatible with standard 0402 (inch) land patterns. Thermal performance is optimized via exposed pad design with RθJA = 443.4 °C/W under JEDEC High-K board conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (–) | Thermistor negative terminal | Must be held at lower voltage potential than Pin 2; reverse bias may cause measurement inaccuracy or damage |
| 2 (+) | Thermistor positive terminal | Connected to higher voltage node in voltage divider or current source output; polarity defines correct PTC behavior |
Key Features
| Feature | Design Value |
|---|---|
| Linear PTC response | Eliminates need for NTC-style parallel linearization resistors or complex piecewise calibration in microcontroller firmware |
| Ratiometric voltage-divider compatibility | Enables VBias-to-ADC-reference coupling for supply-tolerance cancellation, reducing system-level calibration burden |
| Fail-safe short-circuit behavior | Resistance increases under overcurrent, limiting self-heating and preventing thermal runaway-unlike NTCs that degrade under fault |
| Low self-heating impact | 0.5% typical long-term drift at 150 °C confirms minimal thermal mass and stable operation near heat sources |
| Automotive qualification | AEC-Q100 Grade 1 certification with HBM ±2000 V / CDM ±1000 V ESD ratings ensures robustness in noisy vehicle environments |
Applications
| Display Backlight Thermal Compensation | Battery Management System (BMS) Cell Monitoring |
|---|---|
|
Use Scenario: Compensating LED brightness drift caused by ambient and self-heating in automotive infotainment displays. IC Role / Device Role / Timing Role: Linear thermistor providing analog voltage proportional to local PCB temperature adjacent to backlight driver ICs. Use Value: Enables single-resistor voltage-divider interface with MCU ADC, avoiding lookup tables and reducing firmware memory footprint by >70% vs. NTC solutions. |
Use Scenario: Monitoring individual Li-ion cell temperature during fast charging in EV traction battery packs. IC Role / Device Role / Timing Role: Passive temperature sensor placed directly on cell tab or busbar to detect thermal gradients before cell imbalance occurs. Use Value: 0.6 s thermal response time allows detection of rapid exothermic events; ±0.5% drift ensures accuracy over 15-year service life without recalibration. |
| Motor Control Inverter Thermal Threshold Detection | On-Board Charger (OBC) DC-DC Converter Hot-Spot Monitoring |
|
Use Scenario: Triggering thermal foldback or shutdown when IGBT gate driver temperature exceeds safe operating area. IC Role / Device Role / Timing Role: Two-terminal PTC thermistor integrated into gate driver heatsink to provide fast, reliable overtemperature signal to protection logic. Use Value: Built-in fail-safe behavior prevents false trips during short-circuit faults-resistance rises instead of collapsing, maintaining trip integrity. |
Use Scenario: Detecting localized hot spots in high-frequency transformer windings or synchronous rectifier MOSFETs within OBC power stages. IC Role / Device Role / Timing Role: Surface-mount thermistor soldered directly onto transformer core or MOSFET drain pad for minimal thermal lag. Use Value: X1SON 0.6 mm × 1.0 mm footprint enables placement <1 mm from heat source; 443.4 °C/W RθJA ensures accurate junction-proxy readings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear thermistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMP6131QDECRQ1 | 10-kΩ R25, same ±1% tolerance, identical X1SON package and AEC-Q100 Grade 1 rating | Lower resistance yields higher current draw and greater self-heating risk in low-power systems | Select when system bias network uses 10-kΩ reference resistor or requires higher output voltage swing per °C |
| TMP6431QDQCRQ1 | SOT-5X3 (DYA) package, 0.6 mm × 1.0 mm body, rated for –40 °C to 150 °C (AEC-Q100 Grade 0) | Higher max temperature rating suits under-hood locations near engines or inverters exceeding 125 °C ambient | Choose when thermal environment exceeds 125 °C or layout requires 0603-compatible footprint with enhanced thermal mass |
Compared with TMP6431QDECRQ1, TMP6131QDECRQ1 offers lower R25 for higher sensitivity in low-voltage bias schemes, while TMP6431QDQCRQ1 extends operational range to 150 °C using a physically identical but thermally rated SOT-5X3 variant-neither is pin-compatible, but both share identical electrical characterization and software interface requirements.
Availability
TMP6431QDECRQ1 is available at Aetrix Electronics and suitable for battery management systems, motor control inverters, and on-board chargers requiring stable component supply with automotive-grade traceability and long-lifecycle support.
Supply support for TMP6431QDECRQ1 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-grade signal chain solutions with over 90 years of innovation in precision sensing and power management.
The TMP64-Q1 product line delivers silicon-based linear thermistors designed specifically for automotive thermal monitoring where NTC limitations-nonlinearity, calibration complexity, and fault-mode instability-must be eliminated without increasing system cost or size.
FAQ
What is the maximum recommended bias voltage for TMP6431QDECRQ1?
The TMP6431QDECRQ1 has an absolute maximum voltage rating of 6 V across pins 1 (–) and 2 (+), with a recommended operating limit of 5.5 V. Exceeding 5.5 V risks accelerated long-term drift and violates AEC-Q100 stress limits. For optimal accuracy and lifetime, TI specifies 5.5 V as the maximum functional bias voltage in all recommended operating conditions tables for the TMP6431QDECRQ1.
Does TMP6431QDECRQ1 require external linearization circuitry?
No, the TMP6431QDECRQ1 does not require external linearization circuitry. Its silicon PTC structure provides inherently linear resistance vs. temperature behavior across –40 °C to 125 °C, enabling direct use with simple voltage-divider or current-source biasing. Unlike NTC thermistors, the TMP6431QDECRQ1 eliminates the need for parallel resistors or complex calibration polynomials-TI's Thermistor Design Tool generates application-specific R-T tables based on actual bias conditions for the TMP6431QDECRQ1.
What is the thermal response time of TMP6431QDECRQ1 in still air?
The TMP6431QDECRQ1 exhibits a thermal response time of 3.2 seconds to reach 63% of ΔT when transitioning from 25 °C to 70 °C in still air. This value is measured per JEDEC JESD51-13 and reflects real-world convection-limited performance on standard FR-4 PCBs. The faster 0.6 s response in stirred liquid highlights its capability for high-dynamic thermal event detection when mounted near forced-air or liquid-cooled components.
How does the fail-safe behavior of TMP6431QDECRQ1 work during a short-circuit condition?
During a short-to-supply fault, the TMP6431QDECRQ1's positive temperature coefficient causes its resistance to increase with rising self-heating, thereby limiting current and power dissipation. This intrinsic behavior prevents thermal runaway-unlike NTC thermistors, which decrease resistance under self-heating and enter destructive positive feedback. The TMP6431QDECRQ1's fail-safe mechanism is process-built and requires no external circuitry, ensuring reliability in safety-critical automotive subsystems.
Can TMP6431QDECRQ1 be used with a ratiometric ADC configuration?
Yes, TMP6431QDECRQ1 is explicitly designed for ratiometric operation. When used in a voltage-divider with a matched bias resistor (e.g., 47 kΩ ±0.01%), tying VBias to the ADC reference voltage cancels supply tolerance effects. Equation 4 in the TMP6431QDECRQ1 datasheet confirms full cancellation of VBias in the ADC code calculation, delivering measurement accuracy independent of rail variation-a key advantage over non-ratiometric NTC implementations.
TMP6431QDECRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 0402 (1006 Metric)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Resistance @ 25°C:
- 47 kOhms
- Resistance Tolerance:
- ±1%
- Operating Temperature:
- -40°C ~ 125°C
- Power - Max:
- -
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 2-X1SON (1x0.6)
TMP6431QDECRQ1 FAQ
1.How can I place an order for TMP6431QDECRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP6431QDECRQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TMP6431QDECRQ1 reliable?
The price and inventory of TMP6431QDECRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP6431QDECRQ1 is usually 5 days.
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TMP6431QDECRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP6431QDECRQ1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TMP6431QDECRQ1?
For technical support, including TMP6431QDECRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP6431QDECRQ1 requirements.
6.How does Aetrix verify that TMP6431QDECRQ1 is sourced from the original manufacturer or authorized distributors?
All TMP6431QDECRQ1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TMP6431QDECRQ1 meets industry standards.
7.What is the process for return or replacement of TMP6431QDECRQ1?
All TMP6431QDECRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TMP6431QDECRQ1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TMP6431QDECRQ1 part is unused and in its original packaging.
Return procedure for TMP6431QDECRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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