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Texas Instruments TMP6331DYAT
- Part No.:
- TMP6331DYAT
- Manufacturer:
- Texas Instruments
- Category:
- PTC Thermistors
- Package:
- SC-79, SOD-523
- Datasheet:
-
TMP6331DYAT.pdf
- Description:
- SENSOR PTC 100KOHM 1% SOT5X3
- Quantity:
- Payment:
- Shipping:
Inventory:970
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Product details
Overview
TMP6331DYAT from Texas Instruments is a silicon-based linear positive temperature coefficient (PTC) thermistor in a 0603-compatible SOT-5X3 package, with 100-kΩ nominal resistance at 25 °C (±1% tolerance over 0 °C to 70 °C), 6400 ppm/°C TCR at 25 °C, and operating range from –40 °C to +150 °C. It delivers fast thermal response (0.6 s in stirred liquid), built-in fail-safe behavior during short-circuit events, and 0.3% typical long-term drift - enabling high-accuracy, low-calibration temperature sensing in space-constrained motor control and charger systems.
For engineers reviewing the TMP6331DYAT datasheet, TMP6331DYAT pinout, TMP6331DYAT application, or TMP6331DYAT equivalent, key selection considerations include its linear R–T curve eliminating external linearization circuitry, ratiometric voltage-divider compatibility with ADC reference sharing, ±0.2% TCR tolerance across temperature, self-heating immunity due to low thermal mass, and fail-safe PTC behavior under overvoltage conditions.
Technical Context
The TMP6331DYAT operates as a two-terminal passive resistive sensor whose resistance increases linearly with temperature. Its PTC behavior arises from controlled silicon doping and active-area geometry, yielding stable 6400 ppm/°C TCR at 25 °C with ±0.2% tolerance across –40 °C to 125 °C. Unlike NTC thermistors, it requires no parallel linearization resistors or midpoint calibration.
It functions exclusively in a bias-dependent mode: resistance measurement relies on either a precision current source (e.g., 40 µA) or a voltage divider with 100-kΩ bias resistor. Output voltage VTEMP = IBIAS × RTMP6331DYAT or VTEMP = VBIAS × RTMP6331DYAT/(RBIAS + RTMP6331DYAT), and must be digitized via ADC for temperature derivation using TI's Thermistor Design Tool-generated R–T tables or polynomials.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| R₂₅ | 100 kΩ at 25 °C - defines baseline resistance for all temperature calculations and enables direct comparison with 100-kΩ bias networks. |
| Resistance Tolerance | ±1% over 0 °C to 70 °C - reduces system-level calibration burden and supports single-point factory trim. |
| TCR at 25 °C | +6400 ppm/°C - ensures predictable, uniform resistance change per degree, simplifying polynomial fitting and lookup table design. |
| Operating Temperature | –40 °C to +150 °C (SOT-5X3/DYA package) - supports under-hood automotive, industrial motor, and high-temp charger applications. |
| Thermal Response Time | 0.6 s (63% step in stirred liquid) - enables rapid detection of thermal transients in real-time protection circuits. |
| Max Bias Voltage | 5.5 V - sets upper limit for voltage-divider supply rails without risking absolute maximum stress. |
| Max Sense Current | 40 µA - constrains self-heating to <0.22 mW, preserving measurement accuracy in low-power systems. |
Pinout & Package
The TMP6331DYAT is housed in a 2-pin SOT-5X3 (DYA) package measuring 0.80 mm × 1.20 mm, optimized for 0603 footprint compatibility and high-density PCB 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 irreversible damage or parametric shift. |
| 2 (+) | Thermistor positive terminal | Connected to higher voltage node in bias network; polarity-sensitive operation ensures correct PTC behavior and fail-safe response. |
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 during short-to-supply events prevents thermal runaway - critical for unattended motor or battery charger protection. |
| Ratiometric voltage-divider compatibility | Enables VBIAS = VREF configuration where supply tolerance cancels out - achieves ±0.5 °C accuracy without precision voltage references. |
| Low long-term drift | 0.3% typical drift after 1000 hours at 150 °C - ensures stable calibration over product lifetime in industrial environments. |
| Fast thermal response | 0.6 s time constant in liquid - allows real-time thermal shutdown in power converters before catastrophic failure occurs. |
Applications
| Motor Thermal Protection | USB-C Charger Temperature Monitoring |
|---|---|
|
Use Scenario: Embedded in motor windings or heatsink to detect overtemperature during stall or overload conditions. IC Role / Device Role / Timing Role: Two-terminal analog temperature transducer providing linear resistance feedback to comparator or microcontroller ADC input. Use Value: Enables immediate thermal shutdown at precise thresholds (e.g., 125 °C) without software interpolation, leveraging built-in fail-safe PTC behavior to prevent cascade failure. |
Use Scenario: Mounted near GaN FETs and output capacitors to monitor real-time die temperature during high-power PD negotiation. IC Role / Device Role / Timing Role: Passive linear thermistor interfaced via 40-µA current source to maximize ADC code utilization across 0 °C–125 °C range. Use Value: Delivers ±0.3 °C accuracy with no linearization firmware, reducing MCU processing load and enabling dynamic power throttling within USB PD specification timing windows. |
| HVAC Thermostat Sensing | Industrial PLC Module Calibration |
|
Use Scenario: Surface-mounted on thermostat PCB near ambient air inlet to track room temperature with minimal self-heating error. IC Role / Device Role / Timing Role: Low-power (≤40 µA) linear resistive element used in ratiometric voltage divider with 100-kΩ bias resistor and shared ADC reference. Use Value: Achieves ±0.2 °C repeatability over 10-year field life due to 0.3% typical long-term drift and ±0.2% TCR tolerance - meets ENERGY STAR® HVAC accuracy requirements. |
Use Scenario: Integrated into modular I/O baseplate to compensate for temperature-induced gain/offset drift in analog input channels. IC Role / Device Role / Timing Role: High-stability reference sensor (100-kΩ R₂₅, ±1% tolerance) placed adjacent to op-amps and ADCs for real-time thermal coefficient correction. Use Value: Reduces channel-to-channel thermal mismatch by >60% versus NTC solutions, enabling single-point calibration across –40 °C to +70 °C operating envelope. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear thermistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMP6331DEC | Same electrical specs but in 0402-compatible X1SON (DEC) package (0.60 mm × 1.00 mm); max operating temp limited to +125 °C. | Better suited for ultra-compact consumer electronics where board space is constrained and ambient temps stay below 125 °C. | Select TMP6331DEC when footprint size is prioritized over extended temperature range; not suitable for under-hood or high-temp industrial use. |
| TMP6431DYAT | 47-kΩ R₂₅ (vs. 100-kΩ), identical TCR, package, and temp range; different bias network scaling required. | Optimized for lower-voltage systems (e.g., 3.3-V ADCs) where 100-kΩ causes excessive VTEMP swing or current sourcing limitations. | Choose TMP6431DYAT when existing 47-kΩ bias networks exist or when lower full-scale voltage output improves SNR in low-voltage signal chains. |
Compared with TMP6331DEC and TMP6431DYAT, the TMP6331DYAT uniquely balances 100-kΩ baseline resistance for standard bias networks, +150 °C operation for harsh environments, and SOT-5X3 mechanical robustness - making it the optimal choice for industrial motor drives and high-power chargers requiring both precision and reliability.
Availability
TMP6331DYAT is available at Aetrix Electronics and suitable for motor thermal protection, USB-C charger temperature monitoring, and industrial PLC module calibration requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for TMP6331DYAT 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 high-reliability components for industrial, automotive, and communications markets.
The TMP63 series was designed as a silicon-based linear PTC thermistor family to replace legacy NTCs in applications demanding simplified signal conditioning, enhanced high-temperature sensitivity, and intrinsic fail-safe behavior - targeting motor control, power conversion, and thermal management systems.
FAQ
What is the maximum operating temperature for the TMP6331DYAT?
The TMP6331DYAT has a maximum operating temperature of +150 °C when packaged in the SOT-5X3 (DYA) form factor. This rating is validated per TI's SNIS211D datasheet Revision D and applies specifically to the DYA variant - the X1SON (DEC) version is rated only to +125 °C. Operation beyond +150 °C risks permanent parametric shift or junction failure.
Does the TMP6331DYAT require external linearization circuitry?
No, the TMP6331DYAT does not require external linearization circuitry. Its silicon-based PTC structure provides a highly linear resistance-vs.-temperature curve across –40 °C to +150 °C, with ±0.2% TCR tolerance. This eliminates the need for parallel resistors or complex NTC lookup tables - enabling direct use with simple voltage dividers or current sources and reducing firmware complexity in the host microcontroller.
How is the TMP6331DYAT protected against short-circuit failures?
The TMP6331DYAT incorporates built-in fail-safe behavior: during a short-to-supply event, rising current causes self-heating, which - due to its positive temperature coefficient - increases resistance and inherently limits further current flow. This negative feedback loop prevents thermal runaway, unlike NTC thermistors that decrease resistance under self-heating and accelerate failure. This feature is documented in Section 8.3.4 of the SNIS211D datasheet.
What bias conditions are recommended for optimal accuracy with the TMP6331DYAT?
TI recommends either a 40-µA precision current source or a 100-kΩ bias resistor in a voltage-divider configuration with VBIAS tied to the ADC reference voltage. The current-source method yields up to 40 mV/°C sensitivity and full ADC code utilization; the ratiometric voltage-divider cancels VBIAS tolerance errors. Both methods are validated in Section 9.2.1 of the TMP6331DYAT datasheet and require use of TI's Thermistor Design Tool for R–T table generation.
Can the TMP6331DYAT be used in automotive applications?
The standard TMP6331DYAT is catalog-grade and not AEC-Q200 qualified. For automotive use, TI offers the TMP6331DYAQ1 variant - an Automotive Grade-0 part rated for –40 °C to +150 °C and qualified to AEC-Q200. The TMP6331DYAT itself lacks automotive qualification documentation and should not be deployed in safety-critical vehicle subsystems without additional validation and derating.
TMP6331DYAT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Resistance @ 25°C:
- 100 kOhms
- Resistance Tolerance:
- ±1%
- Operating Temperature:
- -40°C ~ 150°C
- Power - Max:
- -
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-5X3
TMP6331DYAT FAQ
1.How can I place an order for TMP6331DYAT through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP6331DYAT 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 TMP6331DYAT reliable?
The price and inventory of TMP6331DYAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP6331DYAT is usually 5 days.
3.What payment methods are accepted for TMP6331DYAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP6331DYAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP6331DYAT?
TMP6331DYAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP6331DYAT 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 TMP6331DYAT?
For technical support, including TMP6331DYAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP6331DYAT requirements.
6.How does Aetrix verify that TMP6331DYAT is sourced from the original manufacturer or authorized distributors?
All TMP6331DYAT 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 TMP6331DYAT meets industry standards.
7.What is the process for return or replacement of TMP6331DYAT?
All TMP6331DYAT units undergo pre-shipment inspection (PSI). If there is an issue with TMP6331DYAT, 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 TMP6331DYAT part is unused and in its original packaging.
Return procedure for TMP6331DYAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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