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Texas Instruments TMP451AQDQFTQ1
- Part No.:
- TMP451AQDQFTQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-WFDFN
- Datasheet:
-
TMP451AQDQFTQ1.pdf
- Description:
- TEMPERATURE SENSOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,281
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Product details
Overview
TMP451AQDQFTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade digital temperature sensor with integrated local and remote (diode-based) sensing channels, ±1°C accuracy (0°C to 70°C), 0.0625°C resolution, and SMBus-compatible two-wire interface - used for real-time thermal monitoring of ECUs, TCUs, and LED headlight drivers in harsh-temperature environments.
For engineers reviewing the TMP451AQDQFTQ1 datasheet, TMP451AQDQFTQ1 pinout, TMP451AQDQFTQ1 application, or TMP451AQDQFTQ1 equivalent, key selection criteria include remote diode series-resistance cancellation (up to 1 kΩ), programmable η-factor and offset correction, diode fault detection, and wettable-flank WSON-8 (2.0 mm × 2.0 mm) packaging for automated optical inspection.
Technical Context
The TMP451AQDQFTQ1 implements dual-channel 12-bit ADC conversion for local thermal transistor and external remote diode/BJT junctions, with independent programmable digital filtering (Level 1: 4-sample moving average; Level 2: 8-sample moving average) applied to remote measurements before ALERT/THERM limit comparison. It supports SMBus Fast Mode (≤400 kHz) and High-Speed Mode (≤2.5 MHz) with built-in spike suppression and Schmitt-triggered SDA/SCL inputs.
Its architecture includes dedicated hardware for series resistance cancellation, η-factor compensation (default 1.008), and open-circuit/short-circuit fault detection on D+ input - all configurable via registers accessible over the two-wire bus. The device enters shutdown mode (<3 µA) when SD bit = 1, retaining SMBus addressability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±1°C max (–40°C to 125°C ambient); enables reliable ECU core temperature guardbanding without calibration. |
| Remote Accuracy | ±1°C max (0°C to 70°C ambient, –55°C to 150°C diode temp); supports precise microcontroller junction monitoring. |
| Resolution | 0.0625°C (12-bit data format); allows fine-grained thermal trend analysis for fan control or derating logic. |
| Supply Range | 1.7 V to 3.6 V; compatible with automotive 3.3 V and 2.5 V domains without level-shifting. |
| Operating Current | 27 µA typical at 1 conversion/sec; enables always-on thermal supervision in low-power vehicle modules. |
| Shutdown Current | 3 µA typical; reduces standby power in infotainment systems during ignition-off states. |
| SMBus Speed | Up to 2.5 MHz (High-Speed Mode); permits rapid polling across multi-sensor thermal networks. |
| Package | WSON-8 (DQF), 2.00 mm × 2.00 mm with standard footprint; supports high-density PCB layouts and AVI-ready solder joints. |
Pinout & Package
Package: WSON-8 (DQF), 2.00 mm × 2.00 mm, wettable flanks, 0.5-mm pitch, exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Power supply input | Accepts 1.7–3.6 V; powers internal regulator, ADC, and logic; requires local 100-nF ceramic decoupling. |
| D+ | Remote sensor positive input | Analog input for diode/BJT anode; includes fault detection (open/short) and series-resistance cancellation. |
| D− | Remote sensor negative input | Analog input for diode/BJT cathode; differential pair with D+ rejects common-mode noise up to 1000 pF. |
| THERM | Digital output (open-drain) | Configurable thermal alert/fan-control signal; active-low, requires external pullup to 1.7–3.6 V. |
| GND | Ground reference | Return path for analog and digital circuits; must connect directly to PCB ground plane under package. |
| SCL | Serial clock input | Master-generated clock; Schmitt-triggered, supports 1 kHz–2.5 MHz; requires pullup resistor. |
| SDA | Serial data bidirectional I/O | Open-drain data line; supports read/write register access; integrated spike filter improves bus robustness. |
| ALERT/THERM2 | Digital output (open-drain) | Programmable second thermal interrupt; can mirror THERM or trigger on independent limits. |
Key Features
| Feature | Design Value |
|---|---|
| Series resistance cancellation | Hardware-compensates up to 1 kΩ trace resistance on D+/D− lines, eliminating manual offset calibration in production. |
| Programmable η-factor | Adjusts ideality factor (default 1.008) to match specific diode characteristics, improving remote measurement fidelity. |
| Digital filter (Level 1/2) | Reduces noise-induced spikes in remote readings: Level 1 averages 4 samples; Level 2 averages 8 samples before limit comparison. |
| Diode fault detection | Automatically flags open-circuit (D+ > V+ − 0.3 V) and short-circuit (–64°C output), preventing false thermal shutdowns. |
| Wettable flanks package | Enables automated visual inspection (AVI) of solder joints on 2.0 mm × 2.0 mm WSON, reducing post-reflow defect escapes. |
| Extended temperature range mode | Configurable RANGE bit enables –64°C to 191°C measurement span (though diode and ambient specs remain –55°C to 150°C / –40°C to 125°C). |
Applications
| Automotive Infotainment SoC Thermal Monitoring | Engine Control Unit (ECU) Processor Junction Sensing |
|---|---|
Use Scenario: Real-time die temperature tracking of quad-core application processors in head-unit systems operating from –40°C to 85°C ambient. IC Role / Device Role / Timing Role: Remote temperature sensor interfacing with substrate diode inside SoC; provides 0.0625°C-resolution readings every 34 ms (one-shot mode). Use Value: Enables dynamic frequency scaling and thermal throttling to prevent silicon degradation while maintaining UI responsiveness. |
Use Scenario: Continuous junction temperature supervision of 32-bit MCU in engine bay, exposed to transient 125°C ambient and EMI-rich ignition noise. IC Role / Device Role / Timing Role: Local + remote dual-channel monitor; local sensor tracks ambient near MCU, remote channel reads internal BJT junction via PCB traces. Use Value: Series resistance cancellation corrects for 500-Ω trace impedance, ensuring ±1°C accuracy without board-level trimming. |
| LED Headlight Driver Thermal Protection | Transmission Control Module (TCM) ASIC Temperature Guarding |
Use Scenario: Closed-loop thermal management of high-brightness LED arrays in adaptive front-lighting systems (AFS), where junction temps exceed 100°C. IC Role / Device Role / Timing Role: Remote sensor connected to LED driver IC's integrated thermal diode; THERM output drives external MOSFET gate for immediate current reduction. Use Value: Programmable hysteresis and dual ALERT/THERM outputs allow staged derating (e.g., dim → pulse → off) before catastrophic failure. |
Use Scenario: Monitoring thermal stress on transmission controller ASIC during aggressive shift scheduling in hot climates (125°C ambient). IC Role / Device Role / Timing Role: Local sensor verifies module ambient, remote channel reads ASIC junction; both channels feed safety-critical ASIL-B thermal watchdog logic. Use Value: Diode fault detection prevents false overtemp lockouts caused by broken sensor traces, improving system availability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote/local temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM75BIMMX/NOPB | Single local-only sensor; no remote channel, no series-resistance cancellation, no η-factor tuning; ±2°C accuracy. | Lacks diode-based junction monitoring capability; suitable only for ambient cabin temperature sensing. | Select only if remote sensing is unnecessary and cost sensitivity outweighs automotive qualification needs. |
| MAX6642AESA+ | Remote-only dual-diode sensor; no local channel; ±1.5°C remote accuracy; SMBus 100 kHz max; SO-8 package. | Requires separate local sensor; lacks wettable flanks and AEC-Q100 Grade 1 rating; limited noise immunity. | Use when space allows discrete local + remote pairing and high-speed bus operation is not required. |
Compared with LM75BIMMX/NOPB and MAX6642AESA+, the TMP451AQDQFTQ1 uniquely integrates local/remote sensing, automotive qualification, series-resistance cancellation, and wettable-flank packaging - enabling single-chip thermal safety compliance in space-constrained ECU and lighting modules without layout compromises.
Availability
TMP451AQDQFTQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, ECU processor temperature monitoring, and LED headlight thermal control requiring stable component supply across extended temperature and long product lifecycles.
Supply support for TMP451AQDQFTQ1 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 delivering analog and embedded processing solutions, with leadership in precision analog, power management, and automotive electronics.
The TMP451-Q1 product line is designed specifically for AEC-Q100 Grade 1 automotive thermal monitoring - targeting high-reliability, multi-point temperature sensing in engine control, body electronics, and ADAS subsystems where ±1°C accuracy and robust noise immunity are mandatory.
FAQ
What is the maximum series resistance the TMP451AQDQFTQ1 can cancel on the remote sensor lines?
The TMP451AQDQFTQ1 supports hardware-based series resistance cancellation up to 1 kΩ on the D+ and D− lines. This eliminates temperature errors introduced by PCB trace resistance or external RC filters, allowing accurate remote diode measurements without manual calibration or layout constraints. The feature is enabled by default and operates continuously during conversions. Verified performance is documented in Figure 6-5 of the TMP451AQDQFTQ1 datasheet.
Does the TMP451AQDQFTQ1 support both local and remote temperature sensing simultaneously?
Yes, the TMP451AQDQFTQ1 performs concurrent local (integrated thermal transistor) and remote (external diode/BJT) temperature measurements. Both channels deliver 12-bit data (0.0625°C resolution) with independent configuration registers. Conversion time for one complete cycle (local + remote) is 34 ms in one-shot mode. The device stores results in separate high/low byte registers, enabling real-time dual-point thermal analysis in automotive control units.
What package variant does TMP451AQDQFTQ1 use, and why is it significant for automotive manufacturing?
TMP451AQDQFTQ1 uses the WSON-8 DQF package: 2.00 mm × 2.00 mm with wettable flanks. This package enables automated visual inspection (AVI) of solder joints during reflow, significantly reducing post-production defect escapes in high-volume automotive assembly. Its compact size supports dense placement near heat sources like MCUs and power stages, while the wettable flank geometry ensures reliable solder fillet formation - a critical requirement for AEC-Q200-compliant manufacturing processes.
How does the programmable digital filter in the TMP451AQDQFTQ1 improve thermal measurement reliability?
The TMP451AQDQFTQ1 includes a programmable digital filter for remote temperature data with two selectable levels: Level 1 applies a 4-sample moving average, and Level 2 applies an 8-sample moving average. This filter operates on raw ADC output before storing values in the result register and before comparing against ALERT/THERM thresholds. It suppresses transient noise spikes from nearby switching regulators or CAN transceivers, preventing false thermal interrupts - especially critical in ECU and TCM applications where erroneous shutdowns compromise functional safety.
Is the TMP451AQDQFTQ1 qualified for automotive use, and what AEC-Q100 grade does it meet?
Yes, the TMP451AQDQFTQ1 is AEC-Q100 qualified for automotive applications and meets Grade 1 specifications: guaranteed operation from –40°C to +125°C ambient temperature. It also complies with HBM ±2000 V and CDM ±750 V (corner pins) ESD ratings per AEC-Q100-002 and -011. These qualifications ensure reliability in under-hood and cabin environments subject to thermal cycling, vibration, and electrical transients - making TMP451AQDQFTQ1 suitable for safety-critical thermal monitoring in ASIL-B systems.
TMP451AQDQFTQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -64°C ~ 191°C
- Output Type:
- SMBus
- Voltage - Supply:
- 1.7V ~ 3.6V
- Resolution:
- 12 b
- Features:
- One-Shot, Output Switch, Programmable Limit, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±1°C (±4°C)
- Test Condition:
- 0°C ~ 70°C (-40°C ~ 125°C)
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 8-WSON (2x2)
TMP451AQDQFTQ1 FAQ
1.How can I place an order for TMP451AQDQFTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP451AQDQFTQ1 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 TMP451AQDQFTQ1 reliable?
The price and inventory of TMP451AQDQFTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP451AQDQFTQ1 is usually 5 days.
3.What payment methods are accepted for TMP451AQDQFTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP451AQDQFTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP451AQDQFTQ1?
TMP451AQDQFTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP451AQDQFTQ1 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 TMP451AQDQFTQ1?
For technical support, including TMP451AQDQFTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP451AQDQFTQ1 requirements.
6.How does Aetrix verify that TMP451AQDQFTQ1 is sourced from the original manufacturer or authorized distributors?
All TMP451AQDQFTQ1 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 TMP451AQDQFTQ1 meets industry standards.
7.What is the process for return or replacement of TMP451AQDQFTQ1?
All TMP451AQDQFTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TMP451AQDQFTQ1, 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 TMP451AQDQFTQ1 part is unused and in its original packaging.
Return procedure for TMP451AQDQFTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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