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Texas Instruments TMP451HQDQFTQ1
- Part No.:
- TMP451HQDQFTQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-WFDFN
- Datasheet:
-
TMP451HQDQFTQ1.pdf
- Description:
- SENSOR TEMPERATURE
- Quantity:
- Payment:
- Shipping:
Inventory:16,284
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Product details
Overview
TMP451HQDQFTQ1 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 (–40°C to 125°C), 0.0625°C resolution, 1.7–3.6 V supply range, and SMBus™/two-wire interface - deployed for real-time thermal monitoring of ECUs, TCUs, and LED headlight drivers.
For engineers reviewing the TMP451HQDQFTQ1 datasheet, TMP451HQDQFTQ1 pinout, TMP451HQDQFTQ1 application, or TMP451HQDQFTQ1 equivalent, key selection considerations include its series-resistance cancellation (up to 1 kΩ), programmable η-factor and offset correction, dual open-drain thermal alert outputs (THERM/ALERT), diode fault detection, and wettable-flank 2.0 mm × 2.0 mm WSON package for automated optical inspection.
Technical Context
The TMP451HQDQFTQ1 implements a dual-channel 12-bit ADC architecture: one channel digitizes the on-die thermal transistor (local), while the other measures voltage across external NPN/PNP or substrate diodes (remote), using current-source excitation (7.5/45/120 µA selectable). It applies real-time series-resistance cancellation and η-factor compensation before storing temperature data in high/low byte registers.
Its SMBus interface supports Fast Mode (≤400 kHz) and High-Speed Mode (≤2.5 MHz), with built-in spike suppression, Schmitt-trigger inputs, and programmable digital filtering (Level 1: 4-sample moving average; Level 2: 8-sample moving average) applied exclusively to remote temperature results prior to limit comparison and ALERT/THERM assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local/Remote Accuracy | ±1°C max over –40°C to 125°C ambient - enables direct use in automotive ECU thermal throttling without calibration. |
| Resolution | 0.0625°C (12-bit) for both channels - supports fine-grained fan speed or LED dimming control steps. |
| Supply Range | 1.7 V to 3.6 V - compatible with 1.8 V and 3.3 V automotive domain controllers and I/O rails. |
| Operating Current | 27 µA typical at 1 conversion/sec - allows continuous monitoring in always-on vehicle modules without battery drain. |
| Series Resistance Cancellation | Up to 1 kΩ - eliminates PCB trace resistance error in remote sensor routing without manual offset tuning. |
| Digital Filter | Programmable 4- or 8-sample moving average on remote channel only - suppresses noise-induced false thermal alerts in noisy engine-bay environments. |
| Package | 8-pin WSON (DQF), 2.00 mm × 2.00 mm with standard footprint - supports high-density automotive PCB layouts and AVI-compatible solder joint inspection. |
Pinout & Package
Package: 8-pin WSON (DQF), 2.00 mm × 2.00 mm body size, non-leaded, wettable flanks - optimized for automated optical inspection and high-reliability automotive reflow.
| 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. |
| GND | Ground reference | Analog and digital common return - must be low-impedance connection to minimize measurement noise. |
| SCL | SMBus clock input | Open-drain, Schmitt-triggered; requires external pullup to 1.7–3.6 V - defines bus timing and synchronization. |
| SDA | SMBus bidirectional data | Open-drain, Schmitt-triggered; requires external pullup - carries address, command, and temperature data. |
| THERM | Thermal shutdown output | Open-drain, active-low; asserts when local or remote exceeds programmed limit - drives fan or processor throttle directly. |
| ALERT/THERM2 | Configurable interrupt output | Open-drain, programmable as second THERM or SMBus alert - enables dual-threshold or fault-signaling schemes. |
| D+ | Remote sensor positive input | Analog input for diode anode or PNP emitter - includes fault detection for open/short conditions. |
| D− | Remote sensor negative input | Analog input for diode cathode or NPN collector - differential pair rejects common-mode noise on long traces. |
Key Features
| Feature | Design Value |
|---|---|
| Series resistance cancellation | Compensates up to 1 kΩ trace resistance in remote diode paths - removes fixed offset error without firmware intervention. |
| Programmable η-factor | Adjusts ideality factor (default 1.008) to match specific transistor/diode characteristics - improves remote accuracy across process variations. |
| Diode fault detection | Identifies open-circuit, short-circuit (–64°C), and reverse-connection faults on D+/D− - prevents invalid thermal decisions in safety-critical systems. |
| Wettable flanks package | 2.0 mm × 2.0 mm WSON with solderable side walls - enables automated visual inspection of solder fillets for zero-defect automotive assembly. |
| Two independent thermal outputs | THERM and ALERT/THERM2 support separate trip thresholds and hysteresis - allows hierarchical thermal management (e.g., warning + shutdown). |
Applications
| Automotive Infotainment SoC Monitoring | ECU Processor Thermal Throttling |
|---|---|
Use Scenario: Real-time junction temperature tracking of application processors in head units under varying compute loads and cabin temperatures. IC Role / Device Role / Timing Role: Local sensor measures die temperature; remote channel monitors external power management IC via substrate diode - both updated every 34 ms in One-Shot mode. Use Value: Enables dynamic DVFS scaling within ±1°C accuracy, preventing thermal runaway while maximizing performance in confined enclosures. |
Use Scenario: Continuous thermal supervision of engine control unit microcontrollers during cold-start, idle, and full-load operation. IC Role / Device Role / Timing Role: Remote diode attached to MCU package; local sensor monitors ambient near ECU housing - dual inputs feed independent THERM and ALERT outputs. Use Value: Triggers immediate fan activation (THERM) and diagnostic logging (ALERT) upon threshold breach, meeting ISO 26262 ASIL-B thermal safety requirements. |
| TCM Transmission Control Module | LED Headlight Thermal Management |
Use Scenario: Monitoring power MOSFET junction temperature in automatic transmission solenoid drivers exposed to under-hood heat soak. IC Role / Device Role / Timing Role: Remote diode embedded in driver IC; series-resistance cancellation compensates for 800 Ω PCB trace length - measurements immune to layout variation. Use Value: Prevents derating of solenoid current during sustained high-temperature operation, maintaining shift precision and clutch engagement reliability. |
Use Scenario: Closed-loop thermal regulation of high-power LED arrays in adaptive front-lighting systems (AFS), where luminance degrades above 85°C. IC Role / Device Role / Timing Role: Local sensor tracks heatsink temperature; remote channel reads LED substrate diode - both fed into PID controller via SMBus polling. Use Value: Maintains lumen output stability across –40°C to 105°C ambient by enabling precise dimming and current reduction before LED color shift occurs. |
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 | Local-only sensor; no remote channel, no series-resistance cancellation, no η-factor tuning; ±2°C accuracy; 8-pin SOIC. | Restricted to ambient or single-die monitoring; unsuitable for multi-point or diode-based junction sensing. | Select only if system uses only local temperature and cost is primary constraint - lacks automotive qualification and remote capability. |
| MAX6642AESA+ | Local + remote sensing; ±2°C accuracy; no series-resistance cancellation; fixed η = 1.008; 8-pin SOIC; 2.7–5.5 V supply. | Lower accuracy limits use in tight thermal margins; wider supply range increases design flexibility but excludes 1.8 V domains. | Consider for non-AEC-Q100 industrial applications requiring dual-channel sensing without advanced compensation features. |
Compared with LM75BIMMX/NOPB and MAX6642AESA+, the TMP451HQDQFTQ1 delivers automotive-grade accuracy (±1°C), on-the-fly series-resistance and η-factor correction, and a compact wettable-flank package - making it uniquely suited for safety-critical, multi-sensor thermal management in modern vehicle ECUs and lighting systems.
Availability
TMP451HQDQFTQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, ECU thermal protection, and LED headlight thermal control requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for TMP451HQDQFTQ1 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 focused on analog and embedded processing technologies, with leadership in automotive, industrial, and power management solutions.
The TMP451-Q1 product line delivers high-accuracy, low-power thermal monitoring ICs specifically engineered for AEC-Q100 Grade 1 automotive subsystems - emphasizing robustness against EMI, series-resistance errors, and harsh thermal environments.
FAQ
What is the operating temperature range of the TMP451HQDQFTQ1?
The TMP451HQDQFTQ1 is qualified for automotive Grade 1 operation, with a specified ambient operating temperature range of –40°C to 125°C. Its local and remote temperature sensors maintain ±1°C maximum accuracy across this full range, and the device supports junction temperatures up to 150°C per absolute maximum ratings - making it suitable for under-hood and powertrain applications where thermal stress is extreme.
Does the TMP451HQDQFTQ1 support remote temperature sensing with discrete transistors?
Yes, the TMP451HQDQFTQ1 supports remote temperature sensing using low-cost discrete NPN or PNP transistors, as well as substrate thermal transistors or diodes integrated into microprocessors, microcontrollers, or FPGAs. Its programmable η-factor (default 1.008) and series-resistance cancellation (up to 1 kΩ) ensure accurate junction temperature readings regardless of transistor type or PCB trace resistance - all without external calibration.
How does the digital filter in the TMP451HQDQFTQ1 improve thermal measurement reliability?
The TMP451HQDQFTQ1 includes a programmable digital filter applied exclusively to remote temperature measurements: Level 1 performs a 4-sample moving average, and Level 2 performs an 8-sample moving average. This reduces susceptibility to transient noise on D+/D− lines - such as EMI from nearby switching regulators - ensuring that ALERT and THERM outputs respond only to sustained thermal events, not momentary spikes.
What package options are available for the TMP451HQDQFTQ1, and why does the DQF variant matter?
The TMP451HQDQFTQ1 is offered in two 8-pin WSON variants: DQF (2.00 mm × 2.00 mm) and DQW (2.50 mm × 2.50 mm with wettable flanks). The DQF package used in TMP451HQDQFTQ1 provides the smallest footprint for space-constrained automotive modules and features standard wettable flanks - enabling automated visual inspection (AVI) of solder joints to meet zero-defect manufacturing standards in Tier-1 production.
Can the TMP451HQDQFTQ1 detect faults in the remote temperature sensor connection?
Yes, the TMP451HQDQFTQ1 includes dedicated diode fault detection on the D+ and D− inputs. It identifies open-circuit conditions (sets OPEN bit in status register), short-circuits (returns –64°C), and reverse-connection faults. The detection circuit uses a voltage comparator that trips when D+ exceeds (V+) – 0.3 V, and the result is continuously checked during each conversion - providing fail-safe thermal monitoring for ASIL-compliant systems.
TMP451HQDQFTQ1 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:
- I2C/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
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 8-WSON (2x2)
TMP451HQDQFTQ1 FAQ
1.How can I place an order for TMP451HQDQFTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP451HQDQFTQ1 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 TMP451HQDQFTQ1 reliable?
The price and inventory of TMP451HQDQFTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP451HQDQFTQ1 is usually 5 days.
3.What payment methods are accepted for TMP451HQDQFTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP451HQDQFTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP451HQDQFTQ1?
TMP451HQDQFTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP451HQDQFTQ1 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 TMP451HQDQFTQ1?
For technical support, including TMP451HQDQFTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP451HQDQFTQ1 requirements.
6.How does Aetrix verify that TMP451HQDQFTQ1 is sourced from the original manufacturer or authorized distributors?
All TMP451HQDQFTQ1 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 TMP451HQDQFTQ1 meets industry standards.
7.What is the process for return or replacement of TMP451HQDQFTQ1?
All TMP451HQDQFTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TMP451HQDQFTQ1, 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 TMP451HQDQFTQ1 part is unused and in its original packaging.
Return procedure for TMP451HQDQFTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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