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Texas Instruments TMP451HQDQWTQ1
- Part No.:
- TMP451HQDQWTQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-WFDFN
- Datasheet:
-
TMP451HQDQWTQ1.pdf
- Description:
- TEMP SENSOR
- Quantity:
- Payment:
- Shipping:
Inventory:4,943
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Product details
Overview
TMP451HQDQWTQ1 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 TMP451HQDQWTQ1 datasheet, TMP451HQDQWTQ1 pinout, TMP451HQDQWTQ1 application, or TMP451HQDQWTQ1 equivalent, key selection considerations include its series-resistance cancellation (up to 1 kΩ), programmable η-factor and offset correction, diode fault detection, dual open-drain thermal alert outputs (THERM/ALERT), and wettable-flank WSON-8 (2.5 mm × 2.5 mm) packaging for automated optical inspection.
Technical Context
The TMP451HQDQWTQ1 implements a dual-channel 12-bit ADC architecture: one channel digitizes the on-die thermal transistor (local), while the other measures voltage across an external NPN/PNP junction (remote) using current-source excitation (7.5–120 µA selectable). It applies real-time series resistance cancellation and η-factor compensation before storing temperature data in high/low byte registers with extended binary format support (–64°C to 191°C).
Its SMBus slave interface supports Fast Mode (≤400 kHz) and High-Speed Mode (≤2.5 MHz), includes built-in spike suppression and Schmitt triggers on SDA/SCL, and enables programmable digital filtering (4- or 8-sample moving average) on remote measurements - all configurable via 8-bit register map with POR defaults. Thermal alerts (THERM and ALERT/THERM2) are independently programmable with hysteresis and consecutive violation thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±1°C max over –40°C to 125°C ambient - ensures reliable junction temperature tracking without calibration in ECU thermal management loops. |
| Remote Accuracy | ±1°C max over –40°C to 100°C ambient & –55°C to 150°C diode range - enables precise die-temperature monitoring of processors/FPGAs using substrate transistors. |
| Resolution | 0.0625°C (12-bit) for both local and remote - supports fine-grained thermal throttling decisions in automotive infotainment SoCs. |
| Supply Range | 1.7 V to 3.6 V - compatible with 1.8 V, 2.5 V, and 3.3 V automotive domain controllers without level-shifting. |
| Quiescent Current | 27 µA typical at 1 conversion/sec - extends battery life in always-on BCM thermal supervision circuits. |
| Shutdown Current | 3 µA typical - allows deep-sleep operation during vehicle ignition-off states while retaining SMBus addressability. |
| SMBus Speed | Up to 2.5 MHz - supports high-throughput thermal polling in multi-sensor clusters (e.g., ADAS domain controllers). |
Pinout & Package
Package: 8-pin WSON (Wettable Flanks), 2.50 mm × 2.50 mm (DQW), RoHS-compliant, with visual solder-joint inspection capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Power supply input | Accepts 1.7–3.6 V; powers internal regulator, ADC, and SMBus I/O - requires local 100 nF ceramic decoupling. |
| GND | Ground reference | Common return for analog and digital sections; must be low-impedance connection to minimize measurement noise. |
| SCL | SMBus clock input | Open-drain, 1.7–3.6 V tolerant; requires external pull-up; supports up to 2.5 MHz timing with defined rise/fall specs. |
| SDA | SMBus bidirectional data | Open-drain, 1.7–3.6 V tolerant; shares bus with other SMBus slaves; includes internal spike filter and Schmitt trigger. |
| THERM | Digital thermal alert output | Open-drain, active-low; asserts when local/remote exceeds programmable limit - directly drives fan control or MCU interrupt. |
| ALERT/THERM2 | Secondary alert or THERM output | Configurable as second independent thermal interrupt or mirrored THERM signal - enables dual-threshold safety logic. |
| D+ | Remote sensor positive input | Analog input for diode anode or PNP emitter; includes fault detection for open/short conditions and series resistance cancellation. |
| D− | Remote sensor negative input | Analog input for diode cathode or PNP collector; differential pair with D+ tolerates up to 1000 pF capacitance and 1 kΩ series resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Series resistance cancellation | Compensates up to 1 kΩ routing resistance in remote diode traces - eliminates need for board-level calibration or manual offset tuning. |
| Programmable η-factor | Adjusts ideality factor (default 1.008) to match specific transistor geometry - improves remote accuracy across silicon process variations. |
| Dual programmable thermal alerts | THERM and ALERT/THERM2 support independent limits, hysteresis, and consecutive-violation filtering - enables fail-safe thermal shutdown and predictive warning. |
| Programmable digital filter | 4- or 8-sample moving average on remote channel - reduces noise-induced false alarms in high-EMI environments like powertrain ECUs. |
| Diode fault detection | Identifies open-circuit, short-circuit (–64°C), and reverse-bias faults on D+/D− - prevents erroneous thermal shutdowns in production systems. |
Applications
| Automotive Infotainment SoC Monitoring | ECU Processor Junction Temperature |
|---|---|
Use Scenario: Real-time thermal supervision of quad-core application processors in head-unit systems under varying ambient and load conditions. IC Role / Device Role / Timing Role: Remote temperature sensor measuring substrate transistor of SoC; local sensor monitors ambient PCB temperature near processor. Use Value: Enables dynamic frequency scaling and display brightness reduction before thermal throttling occurs, maintaining UI responsiveness. |
Use Scenario: Closed-loop thermal protection of engine control unit microcontrollers operating in under-hood environments (–40°C to 125°C). IC Role / Device Role / Timing Role: Local sensor tracks ambient ECU temperature; remote channel monitors MCU die junction via integrated thermal transistor. Use Value: Triggers THERM-driven fan activation and firmware-initiated safe shutdown within <100 ms of exceeding 115°C threshold. |
| TCM Transmission Control Module | LED Headlight Thermal Management |
Use Scenario: Monitoring transmission controller ASIC temperature during gear-shift transients and prolonged highway operation. IC Role / Device Role / Timing Role: Remote sensor connected to ASIC's thermal diode; local sensor validates cold-soak startup behavior. Use Value: Prevents torque derating by detecting localized hot spots before ASIC thermal shutdown, improving shift quality consistency. |
Use Scenario: Regulating high-power LED array temperature in adaptive front-lighting systems (AFS) to maintain lumen output and color stability. IC Role / Device Role / Timing Role: Remote sensor bonded to LED driver IC; local sensor monitors heatsink baseplate temperature. Use Value: Adjusts PWM dimming duty cycle based on real-time junction temperature feedback, extending LED lifetime by >30% at 85°C ambient. |
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; I²C only. | Limited to ambient temperature monitoring; unsuitable for processor/diode junction sensing or automotive-grade thermal safety. | Select only for cost-sensitive non-automotive ambient sensing where remote capability is unnecessary. |
| MAX6642AESA+ | Remote-only sensor; no local channel; ±1.5°C remote accuracy; fixed η = 1.008; SMBus-compatible but no digital filter or wettable flanks. | Requires separate local sensor; lacks dual-alert outputs and failsafe fault detection needed for ASIL-B thermal monitoring. | Consider only when remote sensing is sole requirement and PCB space permits two discrete sensors. |
Compared with LM75BIMMX/NOPB and MAX6642AESA+, TMP451HQDQWTQ1 delivers integrated dual-channel measurement, automotive qualification (AEC-Q100 Grade 1), series-resistance immunity, and production-ready wettable-flank packaging - making it the only option supporting full ASIL-B thermal supervision in single-chip form.
Availability
TMP451HQDQWTQ1 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 lifecycle requirements.
Supply support for TMP451HQDQWTQ1 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 in high-reliability sensor design.
The TMP451-Q1 product line was engineered specifically for AEC-Q100 Grade 1 automotive subsystems requiring robust, high-accuracy thermal monitoring - targeting ECU, TCM, BCM, and ADAS domain controllers where junction temperature fidelity directly impacts functional safety compliance.
FAQ
What is the operating temperature range for the TMP451HQDQWTQ1?
The TMP451HQDQWTQ1 is specified for an ambient operating temperature range of –40°C to 125°C, meeting AEC-Q100 Grade 1 requirements. Its local sensor maintains ±1°C accuracy across this full range, while the remote channel achieves ±1°C accuracy from –40°C to 100°C ambient and –55°C to 150°C diode temperature - validated for under-hood and cabin-mounted automotive modules.
Does the TMP451HQDQWTQ1 support remote temperature sensing with discrete transistors?
Yes, the TMP451HQDQWTQ1 supports remote sensing using low-cost discrete NPN or PNP transistors, as well as substrate thermal transistors 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 impedance.
How does the programmable digital filter in the TMP451HQDQWTQ1 improve thermal measurement reliability?
The TMP451HQDQWTQ1's programmable digital filter performs a 4- or 8-sample moving average on remote temperature measurements, reducing susceptibility to EMI-induced spikes in noisy automotive environments. This filtering is applied before alert generation, ensuring THERM and ALERT outputs reflect true thermal trends - not transient noise - which prevents false shutdowns in powertrain or ADAS ECUs.
What package options are available for the TMP451HQDQWTQ1, and why does the DQW variant feature wettable flanks?
The TMP451HQDQWTQ1 is offered in an 8-pin WSON package, with the DQW variant (2.50 mm × 2.50 mm) featuring wettable flanks. These chamfered package edges enable automatic optical inspection (AOI) of solder joints during reflow, significantly reducing post-production visual inspection time and improving first-pass yield in automotive PCB assembly lines.
Can the TMP451HQDQWTQ1 operate with a 1.8-V supply, and what is its typical current draw?
Yes, the TMP451HQDQWTQ1 operates across 1.7 V to 3.6 V, fully supporting 1.8-V domain controllers. At 1.8 V and default 1 conversion per second, its typical quiescent current is 27 µA; in shutdown mode, it draws just 3 µA - enabling energy-efficient thermal supervision in always-on vehicle networks such as LIN or CAN partial networking states.
TMP451HQDQWTQ1 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, Wettable Flank
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 8-WSON (2x2.5)
TMP451HQDQWTQ1 FAQ
1.How can I place an order for TMP451HQDQWTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP451HQDQWTQ1 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 TMP451HQDQWTQ1 reliable?
The price and inventory of TMP451HQDQWTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP451HQDQWTQ1 is usually 5 days.
3.What payment methods are accepted for TMP451HQDQWTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP451HQDQWTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP451HQDQWTQ1?
TMP451HQDQWTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP451HQDQWTQ1 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 TMP451HQDQWTQ1?
For technical support, including TMP451HQDQWTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP451HQDQWTQ1 requirements.
6.How does Aetrix verify that TMP451HQDQWTQ1 is sourced from the original manufacturer or authorized distributors?
All TMP451HQDQWTQ1 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 TMP451HQDQWTQ1 meets industry standards.
7.What is the process for return or replacement of TMP451HQDQWTQ1?
All TMP451HQDQWTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TMP451HQDQWTQ1, 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 TMP451HQDQWTQ1 part is unused and in its original packaging.
Return procedure for TMP451HQDQWTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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