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Texas Instruments TMP451AQDQWRQ1
- Part No.:
- TMP451AQDQWRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-WFDFN
- Datasheet:
-
TMP451AQDQWRQ1.pdf
- Description:
- IC TEMP SENSOR
- Quantity:
- Payment:
- Shipping:
Inventory:5,120
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Product details
Overview
TMP451AQDQWRQ1 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, SMBus™/two-wire interface, and series-resistance cancellation - used for real-time thermal monitoring of ECUs, TCUs, and LED headlight drivers.
For engineers reviewing the TMP451AQDQWRQ1 datasheet, TMP451AQDQWRQ1 pinout, TMP451AQDQWRQ1 application, or TMP451AQDQWRQ1 equivalent, key selection considerations include its wettable-flank WSON-8 (2.5 mm × 2.5 mm) package, programmable digital filter (Level 1/2 averaging), η-factor and offset correction, diode fault detection, and 1.7 V–3.6 V supply operation in harsh automotive environments.
Technical Context
The TMP451AQDQWRQ1 implements dual-channel 12-bit ADC conversion for local silicon and remote junction (NPN/PNP/diode) temperature sensing, with dedicated analog front-end circuitry for series resistance cancellation up to 1 kΩ and differential input capacitance tolerance up to 1000 pF. Its SMBus slave 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 open-drain digital outputs - THERM (pin 4) and ALERT/THERM2 (pin 6) - each configurable with independent hysteresis and consecutive-limit-violation thresholds (1–4). Shutdown mode reduces quiescent current to 3 µA, while conversion rates scale from 0.0625 Hz to 32 Hz with corresponding IQ from 27 µA to 450 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy (local & remote) | ±1°C max over –40°C to 125°C ambient - enables reliable thermal throttling without calibration overhead in automotive control units. |
| Resolution | 0.0625°C (12-bit data format) - supports fine-grained thermal trend analysis for predictive fan control or LED dimming algorithms. |
| Supply voltage | 1.7 V to 3.6 V - compatible with modern low-voltage automotive domains (e.g., 1.8 V/2.5 V/3.3 V rails) without level-shifting. |
| Operating current | 27 µA typical at 16 conversions/sec - allows continuous monitoring in always-on vehicle subsystems with minimal battery drain. |
| Remote sensing support | Supports NPN/PNP transistors or substrate diodes - enables direct integration with SoC/FPGA thermal diodes without external biasing components. |
| Digital filter | Programmable 4-sample (Level 1) or 8-sample (Level 2) moving average - suppresses EMI-induced spikes in noisy engine-bay or infotainment PCB layouts. |
| Package | 8-pin WSON with wettable flanks (2.50 mm × 2.50 mm, DQW) - provides AOI-verified solder joint integrity for automotive-grade reflow reliability. |
Pinout & Package
Package: 8-pin WSON (DQW) with wettable flanks, 2.50 mm × 2.50 mm body size, 0.5 mm pitch, exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Power supply input | Accepts 1.7 V–3.6 V; powers internal regulator and ADC - requires local 100 nF ceramic decoupling near pin 1. |
| D+ | Remote sensor positive input | Analog input for diode anode/NPN collector - includes fault detection for open/short conditions and series-resistance cancellation logic. |
| D− | Remote sensor negative input | Analog input for diode cathode/NPN emitter - differential pair with D+; rejects common-mode noise up to 1000 pF capacitance. |
| THERM | Digital output (open-drain) | Thermal shutdown alert; active-low, pulled up externally to 1.7–3.6 V - configurable hysteresis prevents chatter during transient thermal events. |
| GND | Ground reference | System ground return for analog and digital sections - must be low-impedance connection to minimize measurement offset. |
| SCL | SMBus clock input | Open-drain input requiring external pullup; accepts 1 kHz–2.5 MHz clocks - integrated Schmitt trigger rejects bus noise. |
| SDA | SMBus bidirectional data | Open-drain I/O with spike suppression - supports read/write register access and interrupt polling without additional bus buffers. |
| ALERT/THERM2 | Dual-function digital output | Configurable as second thermal alert or SMBus alert - enables redundant fault signaling or multi-zone threshold monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Series resistance cancellation | Compensates up to 1 kΩ routing resistance in remote sensor traces - eliminates manual offset tuning and improves first-pass thermal accuracy. |
| η-factor and offset correction | Programmable ideality factor (default 1.008) and per-sensor offset registers - corrects for transistor nonideality and PCB-level thermal gradients. |
| Diode fault detection | Real-time open-circuit, short-circuit, and reverse-connection detection on D+/D− - prevents false thermal alarms and logs status in dedicated register bit. |
| Programmable digital filter | Two-stage software-selectable averaging (4 or 8 samples) applied to remote channel output - reduces susceptibility to switching noise without hardware filtering. |
| Wettable flanks package | Side-wettable leads on 2.5 mm × 2.5 mm WSON - enables automated optical inspection (AOI) of solder fillets for zero-defect automotive assembly. |
Applications
| Automotive Infotainment Systems | ECU Processor Temperature Monitoring |
|---|---|
Use Scenario: Real-time thermal management of SoC, GPU, and memory in head-unit systems operating under extended ambient temperatures. IC Role / Device Role / Timing Role: Dual-channel sensor providing local die temperature and remote SoC diode junction temperature via SMBus polling every 100 ms. Use Value: Enables dynamic clock scaling and display brightness reduction before thermal throttling occurs, maintaining UI responsiveness. |
Use Scenario: Continuous monitoring of engine control unit microcontroller junction temperature during cold-start and high-load operation. IC Role / Device Role / Timing Role: Remote sensor connected to MCU's internal thermal diode; local sensor monitors ambient PCB temperature near power stages. Use Value: Supports ASIL-B compliant thermal shutdown at 125°C with 5°C hysteresis, preventing silicon damage without system-level intervention. |
| TCM Processor Temperature Monitoring | LED Headlight Thermal Control |
Use Scenario: Thermal supervision of transmission control module processors exposed to under-hood heat soak and vibration. IC Role / Device Role / Timing Role: Local sensor tracks ambient board temperature; remote channel reads TCM ASIC diode with η-factor compensation for aging effects. Use Value: Maintains ±1°C accuracy across 15-year vehicle lifetime by correcting for diode ideality drift using programmable η-factor register. |
Use Scenario: Closed-loop thermal regulation of high-power LED arrays in adaptive driving beam (ADB) headlamps. IC Role / Device Role / Timing Role: Remote sensor bonded directly to LED substrate; local sensor monitors heatsink baseplate - both feed PWM dimming algorithm. Use Value: Prevents LED lumen depreciation and color shift by limiting junction temperature to ≤115°C with 0.0625°C resolution feedback. |
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 remote sensing, no series-resistance cancellation, no η-factor correction. | Limited to ambient-only monitoring; unsuitable for processor/junction sensing or automotive Grade 1 operation. | Select only for cost-sensitive non-automotive applications where remote diode sensing is unnecessary. |
| STTS751DTYQTR | ±1.5°C accuracy, 0.125°C resolution, supports SMBus but lacks programmable digital filter and wettable-flank packaging. | Meets basic AEC-Q100 Grade 2 but not Grade 1; no series-resistance cancellation limits trace-length flexibility in ECU designs. | Consider for lower-tier automotive modules where 0.0625°C resolution and 1 kΩ series-resistance tolerance are not required. |
Compared with LM75BIMMX/NOPB and STTS751DTYQTR, the TMP451AQDQWRQ1 uniquely delivers Grade 1 automotive qualification, dual-channel 0.0625°C resolution, on-chip series-resistance cancellation, and wettable-flank WSON packaging - making it the only option qualified for safety-critical ECU, TCM, and LED headlight thermal management where first-pass accuracy and solder-joint reliability are mandatory.
Availability
TMP451AQDQWRQ1 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 production lifecycles.
Supply support for TMP451AQDQWRQ1 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 ICs, with decades of experience delivering AEC-Q100-qualified solutions for safety-critical vehicle systems.
The TMP451-Q1 product line was designed specifically for high-accuracy, low-power thermal monitoring in automotive sub-systems - addressing the need for robust remote diode sensing, series-resistance immunity, and visual-solderability assurance in modern ADAS and electrification platforms.
FAQ
What automotive qualification does the TMP451AQDQWRQ1 meet?
The TMP451AQDQWRQ1 is AEC-Q100 qualified for Grade 1 operation (–40°C to +125°C ambient), with HBM ESD rating of ±2000 V and CDM rating of ±750 V on corner pins. It meets all stress test requirements for automotive electronics, including thermal cycling, humidity bias, and mechanical shock - ensuring reliability in engine bay and cabin-mounted modules.
Does the TMP451AQDQWRQ1 support remote temperature sensing with discrete transistors?
Yes, the TMP451AQDQWRQ1 supports remote sensing using low-cost discrete NPN or PNP transistors, as well as substrate thermal transistors or diodes integrated into microprocessors, microcontrollers, or FPGAs. Its series resistance cancellation and programmable η-factor ensure accurate readings even with long PCB traces or aged silicon junctions.
How does the programmable digital filter in the TMP451AQDQWRQ1 improve measurement stability?
The TMP451AQDQWRQ1 offers two programmable digital filter levels: Level 1 performs a moving average of four consecutive remote temperature samples, and Level 2 averages eight samples. This reduces the impact of EMI and switching noise on the final reported value - especially critical in noisy automotive environments like infotainment power supplies or motor drivers.
What is the purpose of the wettable flanks on the TMP451AQDQWRQ1 WSON package?
The wettable flanks on the TMP451AQDQWRQ1's 2.5 mm × 2.5 mm WSON (DQW) package enable automated optical inspection (AOI) of solder fillets along the side walls. This provides visual confirmation of solder joint integrity - a critical requirement for zero-defect manufacturing in automotive electronics assembly lines.
Can the TMP451AQDQWRQ1 operate with a 1.8-V supply rail?
Yes, the TMP451AQDQWRQ1 operates across a 1.7 V to 3.6 V supply range, fully supporting 1.8 V logic and power domains. Its SMBus interface remains functional at 1.8 V, with VIH = 1.4 V and VIL = 0.45 V - eliminating the need for level shifters when interfacing with 1.8 V microcontrollers or PMICs in modern automotive domain controllers.
TMP451AQDQWRQ1 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)
TMP451AQDQWRQ1 FAQ
1.How can I place an order for TMP451AQDQWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP451AQDQWRQ1 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 TMP451AQDQWRQ1 reliable?
The price and inventory of TMP451AQDQWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP451AQDQWRQ1 is usually 5 days.
3.What payment methods are accepted for TMP451AQDQWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP451AQDQWRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP451AQDQWRQ1?
TMP451AQDQWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP451AQDQWRQ1 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 TMP451AQDQWRQ1?
For technical support, including TMP451AQDQWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP451AQDQWRQ1 requirements.
6.How does Aetrix verify that TMP451AQDQWRQ1 is sourced from the original manufacturer or authorized distributors?
All TMP451AQDQWRQ1 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 TMP451AQDQWRQ1 meets industry standards.
7.What is the process for return or replacement of TMP451AQDQWRQ1?
All TMP451AQDQWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TMP451AQDQWRQ1, 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 TMP451AQDQWRQ1 part is unused and in its original packaging.
Return procedure for TMP451AQDQWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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