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Texas Instruments TMP451HQDQFRQ1
- Part No.:
- TMP451HQDQFRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-WFDFN
- Datasheet:
-
TMP451HQDQFRQ1.pdf
- Description:
- IC TEMP SENSOR
- Quantity:
- Payment:
- Shipping:
Inventory:4,547
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Product details
Overview
TMP451HQDQFRQ1 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, 1.7–3.6 V supply range, and SMBus-compatible two-wire interface - used for precision thermal monitoring in ECU, TCM, and BCM processor subsystems.
For engineers reviewing the TMP451HQDQFRQ1 datasheet, TMP451HQDQFRQ1 pinout, TMP451HQDQFRQ1 application, or TMP451HQDQFRQ1 equivalent, key selection considerations include series-resistance cancellation capability (up to 1 kΩ), programmable η-factor and offset correction, dual digital filter levels, diode fault detection, and wettable-flank WSON-8 (2.0 mm × 2.0 mm) packaging for AVI-compliant solder joint inspection.
Technical Context
The TMP451HQDQFRQ1 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 or substrate diode (remote), applying real-time series-resistance cancellation and η-factor compensation. It supports extended temperature measurement range (–64°C to 191°C) via configurable RANGE bit and stores results in high/low byte registers with 0.0625°C resolution.
Its SMBus slave interface operates at up to 2.5 MHz, includes built-in Schmitt triggers and spike suppression on SDA/SCL, and supports programmable ALERT/THERM2 interrupt behavior with hysteresis and consecutive-limit-violation filtering (1–4 violations). Shutdown mode reduces quiescent current to 3 µA, and conversion rate is configurable from 0.0625 Hz to 32 Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local/Remote Accuracy | ±1°C max (0°C–70°C ambient); enables reliable junction temperature tracking without per-unit calibration |
| Resolution | 0.0625°C (12-bit); allows fine-grained thermal trend analysis and precise trip-point setting |
| Supply Voltage | 1.7 V–3.6 V; compatible with automotive 3.3 V and low-voltage 1.8 V logic domains |
| Operating Current | 27 µA typical (1-shot mode); supports always-on thermal monitoring in power-constrained ECUs |
| Series Resistance Cancellation | Up to 1 kΩ; eliminates PCB trace resistance-induced error without external compensation circuitry |
| Digital Filter | Programmable 4-sample or 8-sample moving average; suppresses noise spikes in high-EMI engine bay environments |
| Package | WSON-8 (2.0 mm × 2.0 mm, DQF); wettable flanks enable automated optical solder-joint inspection |
Pinout & Package
Package: 8-pin WSON (DQF), 2.00 mm × 2.00 mm, wettable flanks, nominal 0.5 mm pitch.
| 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 bypass capacitor |
| D+ | Remote sensor positive input | Analog input for diode anode or PNP emitter; supports series-resistance cancellation and fault detection |
| D− | Remote sensor negative input | Analog input for diode cathode or PNP collector; differential pair with D+ rejects common-mode noise |
| THERM | Digital output (open-drain) | Configurable thermal shutdown/fan-control signal; active-low, requires external pull-up to 1.7–3.6 V |
| GND | Ground reference | Return path for analog and digital circuits; must be low-impedance connection to system ground plane |
| SCL | Serial clock input | SMBus clock line; open-drain, requires external pull-up; supports 1 kHz–2.5 MHz operation |
| SDA | Serial data I/O | Bidirectional SMBus data line; open-drain, requires external pull-up; MSB-first transmission |
| ALERT/THERM2 | Digital output (open-drain) | Programmable second alert output; can mirror THERM or trigger on independent limit conditions |
Key Features
| Feature | Design Value |
|---|---|
| η-Factor and offset correction | Compensates for nonideal diode ideality (default η = 1.008) and sensor-specific offsets, improving remote accuracy across process/voltage/temperature |
| Diode fault detection | Identifies open-circuit, short-circuit (–64°C response), and reverse-biased conditions on D+/D−, preventing false thermal alarms |
| Programmable digital filter | Two-level moving-average filter (4 or 8 samples) applied to remote temperature result register before limit comparison and ALERT assertion |
| Wettable flanks package | DQF WSON-8 provides visible solder fillet for automated visual inspection (AVI), reducing post-reflow defect escape in automotive production |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2 kV and CDM ±750 V (corner pins), meeting automotive reliability requirements |
Applications
| Automotive Infotainment Systems | ECU Processor Temperature Monitoring |
|---|---|
Use Scenario: Real-time thermal management of SoC and GPU in head-unit systems under varying cabin temperatures and compute loads. IC Role / Device Role / Timing Role: Local sensor monitors die temperature; remote sensor tracks SoC junction via integrated substrate diode; SMBus updates every 34 ms. Use Value: Prevents thermal throttling by triggering fan control (THERM) or display dimming (ALERT) before critical junction limits are exceeded. | Use Scenario: Continuous monitoring of microcontroller junction temperature in powertrain control modules exposed to under-hood heat and electrical noise. IC Role / Device Role / Timing Role: Remote channel reads MCU's internal thermal diode; local channel verifies ambient sensor health; series-resistance cancellation compensates for long PCB traces. Use Value: Enables robust overtemperature shutdown (THERM) with <1°C uncertainty, meeting ASIL-B thermal safety requirements. |
| TCM Processor Temperature Monitoring | LED Headlight Thermal Control |
Use Scenario: Thermal supervision of transmission control unit processors during gear-shifting transients and prolonged highway operation. IC Role / Device Role / Timing Role: Dual-sensor architecture simultaneously tracks local ambient and remote processor junction; programmable digital filter suppresses switching noise from solenoid drivers. Use Value: Maintains safe operating temperature via dynamic clock scaling or torque limiting, using accurate remote readings unaffected by trace resistance. | Use Scenario: Closed-loop thermal regulation of high-power LED arrays in adaptive front-lighting systems (AFS), where junction temperature directly impacts lumen output and lifetime. IC Role / Device Role / Timing Role: Remote sensor attached to LED driver IC's thermal diode; local sensor monitors heatsink baseplate; ALERT asserts when forward-voltage-derived junction exceeds 110°C. Use Value: Enables real-time dimming or current derating to extend LED life and maintain photometric compliance across ambient ranges. |
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), ±2°C accuracy, no series-resistance cancellation or η-factor tuning | Lacks remote diode sensing; suitable only for ambient monitoring, not processor junction tracking | Select when only local temperature is required and cost sensitivity outweighs accuracy and feature needs |
| MAX6642AESA+ | Remote-only (no local sensor), ±1°C accuracy, fixed 1.5 kΩ series-resistance cancellation, no programmable digital filter | Requires separate local sensor; lacks dual-alert outputs and wettable-flank package for automotive AVI | Choose for legacy remote-only designs where SMBus compatibility and basic diode sensing suffice |
Compared with LM75BIMMX/NOPB and MAX6642AESA+, the TMP451HQDQFRQ1 uniquely integrates local + remote sensing, full η-factor/offset programmability, and wettable-flank packaging - making it the only option qualified for AEC-Q100 Grade 1 multi-sensor thermal management in modern ECUs and ADAS domains.
Availability
TMP451HQDQFRQ1 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 product lifecycles.
Supply support for TMP451HQDQFRQ1 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 connectivity technologies for automotive, industrial, and consumer markets.
The TMP451-Q1 product line delivers high-accuracy, low-power, AEC-Q100-qualified temperature sensors optimized for multi-point thermal monitoring in automotive electronic control units, body control modules, and advanced driver-assistance systems.
FAQ
What is the maximum series resistance cancellation capability of the TMP451HQDQFRQ1?
The TMP451HQDQFRQ1 supports series resistance cancellation up to 1 kΩ on the remote sensor inputs (D+ and D−). This feature actively compensates for PCB trace resistance and optional external filter resistors, eliminating associated temperature measurement errors without requiring manual calibration or external circuitry. The cancellation is applied automatically during each remote temperature conversion, and its effectiveness is confirmed in Figure 6-5 of the official datasheet.
Does the TMP451HQDQFRQ1 support both local and remote temperature sensing simultaneously?
Yes, the TMP451HQDQFRQ1 integrates two independent temperature sensing channels: a local sensor measuring the die temperature and a remote channel measuring an external diode (e.g., from a microcontroller or FPGA). Both channels operate concurrently, provide 12-bit results (0.0625°C resolution), and are accessible via separate SMBus registers. The device performs one-shot or continuous conversions for both channels, with total conversion time of 34 ms in default mode.
What package type and dimensions does the TMP451HQDQFRQ1 use?
The TMP451HQDQFRQ1 is packaged in an 8-pin WSON (DQF) variant measuring 2.00 mm × 2.00 mm with wettable flanks. This package features a nominal 0.5 mm pitch and exposes solderable sidewalls to enable automated visual inspection (AVI) of solder joints - a critical requirement for automotive manufacturing. It is distinct from the larger 2.50 mm × 2.50 mm DQW variant, and the DQF footprint is specified in TI's SLOS877C datasheet revision C.
How does the programmable digital filter in the TMP451HQDQFRQ1 improve measurement robustness?
The TMP451HQDQFRQ1 includes a programmable digital filter that applies a moving average to remote temperature samples - either 4 samples (Level 1) or 8 samples (Level 2). This filter reduces the impact of transient noise (e.g., from switching regulators or CAN bus activity) before the value is written to the result register and compared against ALERT/THERM limits. Because the filter output drives the interrupt logic, it prevents spurious thermal alerts in electrically noisy automotive environments.
Is the TMP451HQDQFRQ1 qualified for automotive applications?
Yes, the TMP451HQDQFRQ1 is AEC-Q100 qualified for automotive applications, specifically Grade 1 (–40°C to +125°C ambient operating temperature). It meets stringent reliability requirements including HBM ±2 kV ESD rating and CDM ±750 V (corner pins), and is designed for use in safety-critical subsystems such as engine control units, transmission control modules, and body control modules. Its qualification status is documented in Section 1 of the SLOS877C datasheet.
TMP451HQDQFRQ1 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
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 8-WSON (2x2)
TMP451HQDQFRQ1 FAQ
1.How can I place an order for TMP451HQDQFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP451HQDQFRQ1 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 TMP451HQDQFRQ1 reliable?
The price and inventory of TMP451HQDQFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP451HQDQFRQ1 is usually 5 days.
3.What payment methods are accepted for TMP451HQDQFRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP451HQDQFRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP451HQDQFRQ1?
TMP451HQDQFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP451HQDQFRQ1 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 TMP451HQDQFRQ1?
For technical support, including TMP451HQDQFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP451HQDQFRQ1 requirements.
6.How does Aetrix verify that TMP451HQDQFRQ1 is sourced from the original manufacturer or authorized distributors?
All TMP451HQDQFRQ1 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 TMP451HQDQFRQ1 meets industry standards.
7.What is the process for return or replacement of TMP451HQDQFRQ1?
All TMP451HQDQFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TMP451HQDQFRQ1, 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 TMP451HQDQFRQ1 part is unused and in its original packaging.
Return procedure for TMP451HQDQFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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