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Texas Instruments TMP451AQDQWTQ1
- Part No.:
- TMP451AQDQWTQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-WFDFN
- Datasheet:
-
TMP451AQDQWTQ1.pdf
- Description:
- TEMP SENSOR
- Quantity:
- Payment:
- Shipping:
Inventory:578
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Product details
Overview
TMP451AQDQWTQ1 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 TMP451AQDQWTQ1 datasheet, TMP451AQDQWTQ1 pinout, TMP451AQDQWTQ1 application, or TMP451AQDQWTQ1 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 2.5 mm × 2.5 mm WSON package for automated optical inspection.
Technical Context
The TMP451AQDQWTQ1 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 PNP/NPN junction (remote) using programmable current sources (7.5/45/120 µA). It applies real-time series-resistance cancellation and η-factor compensation during conversion to correct for PCB trace resistance and nonideal diode behavior.
Its SMBus interface supports Fast Mode (400 kHz) and High-Speed Mode (2.5 MHz), with built-in spike suppression, Schmitt-trigger inputs, and configurable alert latching via THERM and ALERT/THERM2 pins - both open-drain outputs with independent limit registers, hysteresis control, and consecutive violation filtering (1–4 violations).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local/Remote Accuracy | ±1°C max over –40°C to 125°C ambient - enables reliable thermal throttling without calibration in automotive ECU/TCU environments. |
| Resolution | 0.0625°C (12-bit data format) - supports fine-grained fan speed or LED dimming control based on sub-degree temperature changes. |
| Supply Voltage Range | 1.7 V to 3.6 V - compatible with 2.5 V and 3.3 V automotive domain controllers and low-voltage microcontrollers. |
| Operating Current | 27 µA typical at 1 conversion/sec - allows continuous monitoring in always-on vehicle subsystems without battery drain concerns. |
| Series Resistance Cancellation | Up to 1 kΩ - eliminates need for board-level compensation when routing remote sensor traces across long PCB distances. |
| Digital Filter Levels | Programmable 4-sample or 8-sample moving average - suppresses noise-induced false alerts in high-EMI engine bay or infotainment environments. |
| Package | 8-pin WSON (DQW) with 2.50 mm × 2.50 mm footprint and wettable flanks - enables AOI-compatible solder joint verification for automotive production. |
Pinout & Package
Package: 8-pin WSON (DQW) with 2.50 mm × 2.50 mm body size and wettable flanks for automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Power supply input | Accepts 1.7–3.6 V; powers internal regulator and analog/digital blocks - requires local 100-nF ceramic decoupling. |
| GND | Ground reference | Common return for all analog and digital circuits - must be connected to low-impedance system ground plane. |
| SCL | SMBus clock input | Open-drain input with Schmitt trigger; requires external pullup to same voltage as V+ - supports up to 2.5 MHz clock rate. |
| SDA | SMBus bidirectional data | Open-drain I/O with integrated spike filter; shares pullup with SCL - handles read/write commands and register access. |
| THERM | Digital thermal alert output | Open-drain output asserting low on local/remote overtemperature - configurable hysteresis and latching behavior via registers. |
| ALERT/THERM2 | Secondary alert or dual THERM output | Configurable as second thermal interrupt or alternate alert signal - independent limit register and hysteresis control. |
| D+ | Remote sensor positive input | Analog input for PNP emitter or NPN collector connection - includes fault detection for open/short conditions. |
| D− | Remote sensor negative input | Analog input for PNP base or NPN emitter connection - differential pair with 1000 pF capacitance tolerance. |
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 actual transistor characteristics - improves remote accuracy across process/voltage/temperature corners. |
| Offset correction per channel | Independent 8-bit offset registers for local and remote sensors - enables one-time calibration against reference thermometers. |
| Diode fault detection | Identifies open-circuit, short-circuit, and reverse-biased conditions on D+/D− - prevents invalid temperature reporting in safety-critical systems. |
| Wettable flanks WSON | Exposed copper on package sides enables visual solder fillet inspection - reduces AVI time and improves first-pass yield in automotive SMT lines. |
Applications
| Automotive Infotainment SoC Thermal Monitoring | Transmission Control Module (TCM) Processor Sensing |
|---|---|
Use Scenario: Real-time die temperature tracking of high-performance infotainment application processors during video rendering or navigation compute loads. IC Role / Device Role / Timing Role: Remote temperature sensor interfacing with substrate diode inside SoC package; local sensor monitors ambient PCB temperature near processor. Use Value: Enables dynamic frequency scaling and thermal throttling with ±1°C accuracy - prevents thermal runaway while maintaining UI responsiveness. |
Use Scenario: Continuous junction temperature monitoring of TCM microcontroller under heavy load during gear-shifting sequences. IC Role / Device Role / Timing Role: Local sensor tracks board ambient; remote sensor reads integrated transistor in MCU die - both channels sampled every 34 ms in One-Shot mode. Use Value: Supports ASIL-B compliant thermal shutdown via THERM pin assertion within 34 ms of overtemperature event - meets functional safety timing requirements. |
| Body Control Module (BCM) Power IC Monitoring | LED Headlight Driver Thermal Management |
Use Scenario: Monitoring temperature rise of high-side power switches in BCM door-lock or window-lift driver circuits. IC Role / Device Role / Timing Role: Remote sensor connected to discrete NPN transistor placed adjacent to power MOSFET; local sensor tracks cabin ambient. Use Value: Series-resistance cancellation ensures accurate reading despite 500 Ω trace resistance - avoids premature derating of drive capability. |
Use Scenario: Closed-loop thermal control of high-brightness LED arrays in adaptive front-lighting systems (AFS). IC Role / Device Role / Timing Role: Remote sensor bonded to LED substrate; local sensor monitors heatsink baseplate - both used to adjust PWM dimming in real time. Use Value: Programmable digital filter (Level 2) rejects EMI from nearby switching regulators - maintains stable dimming without flicker or false overtemperature trips. |
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, 9-bit resolution. | Only suitable for ambient temperature monitoring; cannot replace TMP451AQDQWTQ1 in diode-based junction sensing roles. | Select only if system uses only local sensing and cost sensitivity outweighs accuracy and feature requirements. |
| MAX6642AESA+ | Remote-only sensor with local reference; no programmable η-factor; ±1.5°C remote accuracy; 11-bit resolution; 2.7–5.5 V supply. | Lacks local sensor integration - requires separate ambient sensor; incompatible with 1.7–3.6 V low-voltage automotive domains. | Consider only for legacy 3.3 V or 5 V systems where remote-only measurement suffices and wettable-flank inspection is not required. |
Compared with LM75BIMMX/NOPB and MAX6642AESA+, the TMP451AQDQWTQ1 uniquely delivers dual-channel ±1°C accuracy, automotive qualification (AEC-Q100 Grade 1), series-resistance cancellation, and wettable-flank packaging - making it the only option for safety-critical, space-constrained, multi-point thermal management in modern vehicle ECUs and lighting modules.
Availability
TMP451AQDQWTQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, transmission control modules, and LED headlight thermal control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TMP451AQDQWTQ1 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 and embedded processing technologies, with leadership in automotive-grade sensing, power management, and interface solutions.
The TMP451-Q1 product line was designed specifically for high-accuracy, low-power thermal monitoring in automotive subsystems - emphasizing AEC-Q100 compliance, robustness against EMI and series resistance, and manufacturability in automated SMT lines.
FAQ
What is the maximum series resistance the TMP451AQDQWTQ1 can cancel?
The TMP451AQDQWTQ1 supports series resistance cancellation up to 1 kΩ in the remote diode path. This feature compensates for voltage drop across PCB traces or external filter resistors, eliminating fixed temperature offset errors without requiring firmware calibration. The cancellation is applied automatically during each remote temperature conversion and is confirmed in Figure 6-5 of the official datasheet.
Does the TMP451AQDQWTQ1 support both local and remote temperature sensing simultaneously?
Yes, the TMP451AQDQWTQ1 performs concurrent local and remote temperature measurements using independent 12-bit ADC channels. Both channels deliver 0.0625°C resolution and store results in dedicated registers. Conversion time for one complete cycle (local + remote) is 34 ms in One-Shot mode, enabling synchronized thermal visibility across multiple points in automotive control units.
What package variant does TMP451AQDQWTQ1 use, and why is it significant for automotive manufacturing?
The TMP451AQDQWTQ1 uses the 8-pin WSON (DQW) package with 2.50 mm × 2.50 mm body size and wettable flanks. The exposed copper sidewalls enable automated optical inspection (AOI) of solder fillets - reducing visual inspection time and improving first-pass yield in high-reliability automotive SMT lines. This package is explicitly qualified under AEC-Q100 and referenced in TI's orderable addendum.
How does the programmable digital filter in the TMP451AQDQWTQ1 improve noise immunity?
The TMP451AQDQWTQ1 includes a programmable digital filter for remote temperature readings with two configurable levels: Level 1 applies a 4-sample moving average, and Level 2 applies an 8-sample moving average. This filter operates on raw ADC output before limit comparison, reducing susceptibility to transient noise spikes - especially critical in high-EMI environments like engine bays or LED driver circuits.
Can the ALERT and THERM pins of the TMP451AQDQWTQ1 be configured independently?
Yes, the TMP451AQDQWTQ1 supports independent configuration of ALERT (pin 6, also configurable as THERM2) and THERM (pin 4). Each has dedicated limit registers, hysteresis values, and consecutive violation counters (1–4). This allows distinct thermal thresholds for system-level alerts (e.g., dashboard warning) versus hardware shutdown (e.g., forced fan activation), enhancing functional safety design flexibility.
TMP451AQDQWTQ1 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:
- 2-Wire Serial, 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 (TA)
- Mounting Type:
- Surface Mount, Wettable Flank
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 8-WSON (2x2.5)
TMP451AQDQWTQ1 FAQ
1.How can I place an order for TMP451AQDQWTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP451AQDQWTQ1 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 TMP451AQDQWTQ1 reliable?
The price and inventory of TMP451AQDQWTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP451AQDQWTQ1 is usually 5 days.
3.What payment methods are accepted for TMP451AQDQWTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP451AQDQWTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP451AQDQWTQ1?
TMP451AQDQWTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP451AQDQWTQ1 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 TMP451AQDQWTQ1?
For technical support, including TMP451AQDQWTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP451AQDQWTQ1 requirements.
6.How does Aetrix verify that TMP451AQDQWTQ1 is sourced from the original manufacturer or authorized distributors?
All TMP451AQDQWTQ1 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 TMP451AQDQWTQ1 meets industry standards.
7.What is the process for return or replacement of TMP451AQDQWTQ1?
All TMP451AQDQWTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TMP451AQDQWTQ1, 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 TMP451AQDQWTQ1 part is unused and in its original packaging.
Return procedure for TMP451AQDQWTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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