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Texas Instruments TMP6331DECR
- Part No.:
- TMP6331DECR
- Manufacturer:
- Texas Instruments
- Category:
- PTC Thermistors
- Package:
- 0402 (1006 Metric)
- Datasheet:
-
TMP6331DECR.pdf
- Description:
- SENSOR PTC 100KOHM 1% X1SON
- Quantity:
- Payment:
- Shipping:
Inventory:19,700
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Product details
Overview
TMP6331DECR from Texas Instruments is a silicon-based linear positive temperature coefficient (PTC) thermistor in X1SON (DEC) 2-pin 0402-compatible package, delivering ±1% R25 tolerance at 25 °C (100 kΩ), 6400 ppm/°C TCR at 25 °C, and –40 °C to +125 °C operating range - designed for precision temperature monitoring in space-constrained thermal protection circuits.
For engineers reviewing the TMP6331DECR datasheet, TMP6331DECR pinout, TMP6331DECR application, or TMP6331DECR equivalent, key selection considerations include its linear resistance vs. temperature behavior, built-in fail-safe response under short-circuit conditions, low self-heating due to 40 µA max bias current, and compatibility with ratiometric ADC interfaces using voltage-divider or current-source biasing.
Technical Context
The TMP6331DECR operates as a two-terminal passive resistive sensor with polarity-sensitive terminals (+ and –), requiring positive bias where the + terminal is at higher potential than the – terminal. Its resistance changes linearly with temperature across –40 °C to +125 °C (X1SON package), with consistent TCR of 6400 ppm/°C at 25 °C and ±0.2% TCR tolerance over that range.
It exhibits fast thermal response (0.6 s in stirred liquid), low long-term drift (±0.3% typical after 600 h at 150 °C), and intrinsic fail-safe behavior: during overtemperature or short-to-supply events, rising resistance limits current and suppresses thermal runaway - a critical distinction from NTC thermistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| R25 | 100 kΩ nominal resistance at 25 °C - sets baseline scaling for voltage-divider or current-source interface design |
| R25 Tolerance | ±1% (0 °C to 70 °C) - enables single-point calibration without trimming in most industrial applications |
| TCR at 25 °C | +6400 ppm/°C - provides predictable, linear ΔR per °C for simplified polynomial or LUT-based temperature conversion |
| Operating Range | –40 °C to +125 °C (X1SON/DEC package) - supports automotive cabin, industrial motor, and power supply thermal monitoring |
| Max Bias Current | 40 µA - minimizes self-heating error (<0.1 °C typical at 25 °C) and extends sensor lifetime |
| Thermal Response (stirred liquid) | 0.6 s to 63% - enables rapid detection of transient overtemperature events in battery packs or DC-DC converters |
| ESD Rating (HBM) | ±2000 V - ensures robustness during PCB handling and automated assembly without additional protection circuitry |
Pinout & Package
X1SON (DEC) 2-pin package, 0.60 mm × 1.00 mm body size, bottom-exposed thermal pad not electrically connected - optimized for high-density placement adjacent to heat sources and reflow-compatible with standard 0402 footprint layouts.
| 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 accelerated aging |
| 2 (+) | Thermistor positive terminal | Connected to higher voltage node in bias circuit; polarity defines direction of current flow and ensures stable PTC operation |
Key Features
| Feature | Design Value |
|---|---|
| Linear PTC resistance curve | Eliminates need for external linearization resistors or complex NTC lookup tables - reduces BOM count and firmware memory overhead |
| Built-in fail-safe behavior | Self-limiting resistance rise under short-to-supply fault prevents thermal runaway - no external crowbar or shutdown circuit required |
| Low long-term drift | ±0.3% typical after 600 h at 150 °C - maintains accuracy over multi-year deployments in industrial controllers and chargers |
| Ratiometric compatibility | Enables VBIAS = VREF configuration to cancel supply tolerance errors - achieves <±0.5 °C system-level accuracy without precision voltage references |
| 0402-compatible footprint | Facilitates drop-in replacement of legacy NTCs or integration into ultra-compact modules like USB-C PD adapters and wearable sensors |
Applications
| Motor Thermal Protection | Power Supply Inrush Control |
|---|---|
Use Scenario: Monitoring winding temperature in BLDC motors to prevent insulation degradation during sustained overload. IC Role / Device Role / Timing Role: Two-terminal linear thermistor providing analog resistance signal proportional to core temperature - interfaced via 12-bit ADC with 20 µA current source. Use Value: 0.6 s thermal response enables real-time trip before irreversible thermal damage; ±1% R25 tolerance avoids factory calibration per unit. |
Use Scenario: Detecting transformer or MOSFET junction temperature rise during AC-DC converter startup to delay soft-start until safe thermal margin is established. IC Role / Device Role / Timing Role: PTC thermistor placed on heatsink surface, biased with 5 V / 100 kΩ divider to generate ratiometric voltage fed to comparator input. Use Value: Built-in fail-safe ensures resistance increases during overtemperature - preventing false turn-on and enabling reliable thermal lockout without auxiliary logic. |
| Lithium-Ion Battery Pack Monitoring | Industrial HVAC Sensor Node |
Use Scenario: Cell-level temperature sensing in 18650-based battery modules to enforce charge/discharge cutoffs and balance algorithms. IC Role / Device Role / Timing Role: Surface-mount thermistor soldered directly to cell tab, read by microcontroller ADC using VBIAS = VREF configuration. Use Value: Linear output eliminates need for per-cell NTC calibration coefficients; 0.6 mm × 1.0 mm DEC package fits within tight spacing between parallel cells. |
Use Scenario: Wall-mounted thermostat head measuring ambient air temperature with minimal self-heating error from PCB traces or enclosure convection. IC Role / Device Role / Timing Role: Passive PTC element in voltage-divider network, sampled every 2 seconds by low-power MCU with 10-bit SAR ADC. Use Value: ±0.2% TCR tolerance ensures <±0.3 °C error across –20 °C to +60 °C operating band; 40 µA max bias current prevents localized heating artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear PTC thermistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMP6331DYAR | SOT-5X3 (DYA) 0603-compatible package; rated for –40 °C to +150 °C; 0.80 mm × 1.20 mm body; 742.9 °C/W RθJA | Higher max temperature rating suits under-hood automotive or high-temp industrial enclosures; slower thermal response (0.6 s still valid, but board layout affects effective time constant) | Select TMP6331DYAR when ambient exceeds 125 °C or when mechanical robustness in vibration-prone environments is prioritized over minimal footprint. |
| TMP6131DECR | 10 kΩ R25 (vs. 100 kΩ); same X1SON package; identical TCR (6400 ppm/°C); ±1% R25 tolerance; same –40 °C to +125 °C range | Lower impedance improves noise immunity in high-EMI motor drive environments; requires different bias resistor values to maintain ADC resolution | Choose TMP6131DECR when system noise margins are marginal or when existing 10 kΩ reference designs require minimal schematic change. |
Compared with TMP6331DYAR and TMP6131DECR, the TMP6331DECR offers optimal balance of miniaturization (0402 footprint), high-impedance interface compatibility (100 kΩ), and proven stability at 125 °C - making it the preferred choice for space-constrained consumer electronics and portable power systems where thermal response speed and layout density are critical.
Availability
TMP6331DECR is available at Aetrix Electronics and suitable for motor thermal protection, power supply inrush control, lithium-ion battery pack monitoring, and industrial HVAC sensor node applications requiring stable component supply, long-lifecycle support, and traceable sourcing for production programs.
Supply support for TMP6331DECR 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The TMP63 series was developed to replace nonlinear NTC thermistors in precision temperature sensing, offering linear output, built-in fail-safe behavior, and simplified system-level calibration - targeting high-reliability thermal management in power electronics and motor control.
FAQ
What is the maximum operating temperature for the TMP6331DECR?
The TMP6331DECR is rated for continuous operation from –40 °C to +125 °C when used in the X1SON (DEC) package. This limit is defined by its package construction and thermal derating curves - exceeding 125 °C risks accelerated long-term drift and reduced reliability. For applications requiring +150 °C operation, the TMP6331DYAR in SOT-5X3 package is specified.
Does the TMP6331DECR require external linearization circuitry?
No, the TMP6331DECR does not require external linearization circuitry. Its silicon-based PTC structure delivers inherently linear resistance vs. temperature behavior across –40 °C to +125 °C, with ±0.2% TCR tolerance. This eliminates the need for parallel compensation resistors or complex NTC lookup tables - simplifying both hardware design and firmware implementation for the TMP6331DECR.
How is polarity handled on the TMP6331DECR pins?
The TMP6331DECR has polarized terminals: Pin 1 is (–) and Pin 2 is (+). Proper operation requires the + terminal to be at a higher voltage potential than the – terminal. Reversing polarity may cause inconsistent resistance readings and accelerated parametric shift over time. The device's internal doping structure relies on correct bias direction to maintain stable TCR and long-term drift performance for the TMP6331DECR.
Can the TMP6331DECR be used with a ratiometric ADC interface?
Yes, the TMP6331DECR is explicitly designed for ratiometric operation. When biased with a voltage divider where VBIAS is tied to the ADC's reference voltage (VREF), supply tolerance errors cancel - enabling high-accuracy temperature measurement without precision voltage references. This ratiometric configuration is validated in TI's application notes and directly supported by the TMP6331DECR's linear transfer function and low bias current requirements.
What is the thermal response time of the TMP6331DECR in still air?
The TMP6331DECR 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 reflects its small thermal mass and 0.60 mm × 1.00 mm X1SON package geometry. For faster detection in dynamic thermal environments, forced airflow or placement in thermally conductive media (e.g., epoxy-filled cavities) further reduces effective response time for the TMP6331DECR.
TMP6331DECR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 0402 (1006 Metric)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Resistance @ 25°C:
- 100 kOhms
- Resistance Tolerance:
- ±1%
- Operating Temperature:
- -40°C ~ 125°C
- Power - Max:
- -
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 2-X1SON (1x0.6)
TMP6331DECR FAQ
1.How can I place an order for TMP6331DECR through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP6331DECR 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 TMP6331DECR reliable?
The price and inventory of TMP6331DECR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP6331DECR is usually 5 days.
3.What payment methods are accepted for TMP6331DECR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP6331DECR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP6331DECR?
TMP6331DECR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP6331DECR 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 TMP6331DECR?
For technical support, including TMP6331DECR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP6331DECR requirements.
6.How does Aetrix verify that TMP6331DECR is sourced from the original manufacturer or authorized distributors?
All TMP6331DECR 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 TMP6331DECR meets industry standards.
7.What is the process for return or replacement of TMP6331DECR?
All TMP6331DECR units undergo pre-shipment inspection (PSI). If there is an issue with TMP6331DECR, 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 TMP6331DECR part is unused and in its original packaging.
Return procedure for TMP6331DECR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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