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Texas Instruments TMP451HQDQWRQ1
- Part No.:
- TMP451HQDQWRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-WFDFN
- Datasheet:
-
TMP451HQDQWRQ1.pdf
- Description:
- IC TEMP SENSOR
- Quantity:
- Payment:
- Shipping:
Inventory:15,116
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Product details
Overview
TMP451HQDQWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified digital temperature sensor with integrated local and remote (diode-based) sensing channels, ±1°C accuracy (0°C–70°C), 0.0625°C resolution, and SMBus™/two-wire interface - used for precision thermal monitoring in engine control units, infotainment processors, and LED headlight drivers.
For engineers reviewing the TMP451HQDQWRQ1 datasheet, TMP451HQDQWRQ1 pinout, TMP451HQDQWRQ1 application, or TMP451HQDQWRQ1 equivalent, key selection criteria include remote diode series-resistance cancellation (up to 1 kΩ), programmable η-factor and offset correction, dual open-drain thermal alert outputs (THERM/ALERT), wettable-flank WSON-8 package compatibility, and operation across –40°C to 125°C ambient.
Technical Context
The TMP451HQDQWRQ1 implements a dual-channel 12-bit ADC architecture: one channel digitizes its on-die thermal transistor (local), while the other measures voltage across an external NPN/PNP or substrate diode (remote), applying real-time series-resistance cancellation and η-factor compensation. Its SMBus interface supports fast-mode (400 kHz) and high-speed mode (2.5 MHz) timing with built-in spike suppression and Schmitt triggers on SDA/SCL.
It features two independent open-drain digital outputs - THERM (pin 4) and ALERT/THERM2 (pin 6) - each configurable with programmable hysteresis and consecutive-limit-violation filtering (1–4 samples). Shutdown mode reduces quiescent current to 3 µA, and the device includes diode fault detection (open/short) and programmable digital filtering (Level 1: 4-sample moving average; Level 2: 8-sample).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±1°C max over –40°C to 125°C ambient; enables reliable junction temperature tracking without calibration in ECU/TCM environments. |
| Remote Accuracy | ±1°C max (0°C–70°C ambient, –55°C–150°C diode); validated with series resistance ≤1 kΩ and differential capacitance ≤1000 pF. |
| Resolution | 0.0625°C (12-bit) for both local and remote channels; supports fine-grained thermal throttling decisions in LED headlight drivers. |
| Supply Range | 1.7 V to 3.6 V; compatible with automotive 3.3-V and 2.5-V domain rails without level-shifting. |
| Operating Current | 27 µA typical at 1 conversion/sec; allows continuous monitoring in always-on vehicle subsystems with minimal battery drain. |
| SMBus Speed | Up to 2.5 MHz; supports high-throughput thermal polling in multi-sensor configurations on shared bus segments. |
| Package | 8-pin WSON (DQW) with 2.50 mm × 2.50 mm wettable flanks; enables automated optical inspection (AOI) and robust solder-joint reliability in automotive reflow profiles. |
Pinout & Package
Package: 8-pin WSON (DQW) with 2.50 mm × 2.50 mm body and wettable flanks - optimized for automotive-grade solder joint inspection and thermal performance (RθJA = 128.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Power supply input | Accepts 1.7–3.6 V; powers internal regulator and ADC; POR threshold at 1.2–1.55 V ensures clean startup in noisy automotive rails. |
| GND | Ground reference | Common return for analog and digital sections; decoupling capacitor placement critical for remote measurement noise immunity. |
| D+ | Remote sensor positive input | Analog input for diode anode or PNP emitter; includes fault detection for >V+–0.3 V and open-circuit conditions. |
| D− | Remote sensor negative input | Analog input for diode cathode or PNP collector; paired with D+ for differential remote junction sensing. |
| THERM | Digital output (open-drain) | Configurable thermal shutdown/fan-control signal; asserts low when local or remote exceeds programmed limit minus hysteresis. |
| ALERT/THERM2 | Digital output (open-drain) | Secondary interrupt output; can be configured as alternate THERM or SMBus alert; requires external pullup to 1.7–3.6 V. |
| SDA | Bidirectional SMBus data line | Open-drain I/O with integrated Schmitt trigger; supports fast/high-speed modes; requires pullup resistor per SMBus spec. |
| SCL | SMBus clock input | Input-only clock line with spike suppression; synchronizes register reads/writes; compatible with 1 kHz–2.5 MHz clocks. |
Key Features
| Feature | Design Value |
|---|---|
| Series resistance cancellation | Compensates up to 1 kΩ of PCB trace or filter resistor error in remote diode path - eliminates need for board-level calibration. |
| Programmable η-factor | Adjusts ideality factor (default 1.008) to match specific transistor/diode physics - improves remote accuracy across process variations. |
| Offset correction | Per-channel user-programmable offset (±127°C range) corrects systematic errors from layout asymmetry or sensor mismatch. |
| Programmable digital filter | Two-level moving-average filter (4- or 8-sample) suppresses transient noise on remote channel - reduces false THERM assertions. |
| Diode fault detection | Real-time open/short detection on D+ input; sets OPEN bit in status register - prevents invalid temperature reporting in degraded conditions. |
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 under variable thermal loads. IC Role / Device Role / Timing Role: Remote temperature sensor interfacing with substrate diode inside SoC; local sensor monitors ambient near processor package. Use Value: Enables dynamic frequency scaling and display brightness control based on validated ±1°C remote readings - preventing thermal throttling instability. |
Use Scenario: Continuous junction temperature supervision of MCU and power management ICs in engine bay environments exposed to vibration and wide ambient swings. IC Role / Device Role / Timing Role: Local + remote dual-channel monitor with THERM output directly driving fan controller or safety shutdown logic. Use Value: Delivers fail-safe thermal response with <34 ms total conversion time and programmable hysteresis - meeting ASIL-B thermal protection requirements. |
| LED Headlight Driver Thermal Management | Transmission Control Module (TCM) ASIC Temperature Guarding |
|
Use Scenario: Closed-loop thermal regulation of high-power LED arrays in adaptive front-lighting systems (AFS), where luminance must scale with junction temperature. IC Role / Device Role / Timing Role: Remote sensor bonded to LED driver MOSFET die; local sensor tracks heatsink temperature for derating compensation. Use Value: Achieves 0.0625°C resolution and series-resistance cancellation to maintain consistent lumen output across 10-year vehicle lifetime despite solder fatigue. |
Use Scenario: Monitoring thermal stress on transmission solenoid drivers and communication PHYs during extended highway operation or towing cycles. IC Role / Device Role / Timing Role: Dual-point sensor feeding diagnostic log and real-time CAN message generation via host microcontroller. Use Value: Supports ISO 14229 UDS DTCs (e.g., P003A) with validated ±1°C accuracy - enabling predictive maintenance and warranty analytics. |
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-channel local-only sensor; no remote diode interface, no series-resistance cancellation, no η-factor tuning. | Limited to ambient or package-surface monitoring; unsuitable for SoC/ASIC junction sensing. | Select only when remote sensing is unnecessary and AEC-Q100 qualification is not required. |
| MAX6642AESA+ | Remote+local sensing but lacks wettable-flank package, series-resistance cancellation, and programmable digital filter. | Lower noise immunity in high-EMI engine compartments; requires external calibration for trace resistance effects. | Consider only for non-automotive industrial use where AOI capability and ±1°C remote accuracy are secondary. |
Compared with LM75BIMMX/NOPB and MAX6642AESA+, the TMP451HQDQWRQ1 uniquely delivers automotive-grade dual-channel accuracy with hardware-assisted remote error correction, making it the only option qualified for direct integration into AEC-Q100 Grade 1 ECU, TCM, and BCM thermal architectures.
Availability
TMP451HQDQWRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, engine control units, and LED headlight thermal control requiring stable component supply across extended production lifecycles.
Supply support for TMP451HQDQWRQ1 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 electronics, with decades of experience delivering AEC-Q100-qualified components for safety-critical vehicle systems.
The TMP451-Q1 product line was designed specifically for high-accuracy, low-power thermal monitoring in automotive sub-systems - emphasizing robustness against EMI, PCB trace resistance, and long-term drift in harsh under-hood and cabin environments.
FAQ
What is the maximum series resistance the TMP451HQDQWRQ1 can cancel in remote diode measurements?
The TMP451HQDQWRQ1 supports series resistance cancellation up to 1 kΩ in the remote diode path - compensating for PCB trace resistance and optional low-pass filter resistors without requiring external calibration. This capability is confirmed in Figure 6-5 of the official datasheet and applies directly to the TMP451HQDQWRQ1 under recommended operating conditions (TA = –40°C to 125°C, V+ = 1.7 V to 3.6 V).
Does the TMP451HQDQWRQ1 support both local and remote temperature sensing simultaneously?
Yes, the TMP451HQDQWRQ1 performs concurrent local (on-die thermal transistor) and remote (external diode) temperature measurements with 0.0625°C resolution per channel. Each channel uses independent 12-bit ADCs and registers, and conversion results are stored separately - enabling real-time thermal profiling of both ambient environment and semiconductor junctions in the same device.
What package type does the TMP451HQDQWRQ1 use, and why is it significant for automotive applications?
The TMP451HQDQWRQ1 uses an 8-pin WSON package with wettable flanks (DQW, 2.50 mm × 2.50 mm). This package enables automatic optical inspection (AOI) of solder joints - reducing post-reflow defect escape rates in high-reliability automotive manufacturing. Its RθJA of 128.5°C/W and qualified AEC-Q100 Grade 1 rating (–40°C to 125°C) make it suitable for under-hood and cabin modules.
Can the TMP451HQDQWRQ1 operate on a 2.5-V supply rail?
Yes, the TMP451HQDQWRQ1 operates across a 1.7-V to 3.6-V supply range, fully supporting 2.5-V logic and power domains. Its SMBus interface pins (SCL, SDA, ALERT/THERM2, THERM) accept pull-up voltages from 1.7 V to 3.6 V, ensuring interoperability with mixed-voltage automotive subsystems without level shifters.
How does the programmable digital filter in the TMP451HQDQWRQ1 improve thermal measurement reliability?
The TMP451HQDQWRQ1's programmable digital filter applies a moving average to remote temperature samples - Level 1 averages four consecutive readings, Level 2 averages eight. This suppresses transient noise from nearby switching regulators or CAN transceivers, reducing false THERM assertions and improving stability of thermal control loops in electric powertrain modules.
TMP451HQDQWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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 (±2°C)
- Test Condition:
- 0°C ~ 70°C (-40°C ~ 125°C)
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Mounting Type:
- Surface Mount, Wettable Flank
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 8-WSON (2x2.5)
TMP451HQDQWRQ1 FAQ
1.How can I place an order for TMP451HQDQWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP451HQDQWRQ1 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 TMP451HQDQWRQ1 reliable?
The price and inventory of TMP451HQDQWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP451HQDQWRQ1 is usually 5 days.
3.What payment methods are accepted for TMP451HQDQWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP451HQDQWRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP451HQDQWRQ1?
TMP451HQDQWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP451HQDQWRQ1 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 TMP451HQDQWRQ1?
For technical support, including TMP451HQDQWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP451HQDQWRQ1 requirements.
6.How does Aetrix verify that TMP451HQDQWRQ1 is sourced from the original manufacturer or authorized distributors?
All TMP451HQDQWRQ1 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 TMP451HQDQWRQ1 meets industry standards.
7.What is the process for return or replacement of TMP451HQDQWRQ1?
All TMP451HQDQWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TMP451HQDQWRQ1, 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 TMP451HQDQWRQ1 part is unused and in its original packaging.
Return procedure for TMP451HQDQWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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