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Texas Instruments TMP451JQDQWRQ1
- Part No.:
- TMP451JQDQWRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-WFDFN
- Datasheet:
-
TMP451JQDQWRQ1.pdf
- Description:
- IC TEMP SENSOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,624
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Product details
Overview
TMP451JQDQWRQ1 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 - deployed for ECU, TCM, and BCM processor thermal monitoring.
For engineers reviewing the TMP451JQDQWRQ1 datasheet, TMP451JQDQWRQ1 pinout, TMP451JQDQWRQ1 application, or TMP451JQDQWRQ1 equivalent, this page delivers verified technical context, validated pin functions, real-world automotive use cases, and confirmed alternative options - all grounded in TI's production-grade SLOS877C specification.
Technical Context
The TMP451JQDQWRQ1 implements dual-channel 12-bit ADC conversion for local silicon and remote junction (NPN/PNP/substrate diode) temperature measurement, with programmable η-factor (1.008), offset correction, and two-level digital filtering (4- or 8-sample moving average). It supports SMBus fast mode (400 kHz) and high-speed mode (2.5 MHz).
Its architecture includes dedicated analog front-end circuitry for series resistance cancellation (up to 1 kΩ), differential input capacitance tolerance (≤1000 pF), open/short diode fault detection, and dual open-drain digital outputs (THERM and ALERT/THERM2) with configurable hysteresis and violation counting - all operating from a single 1.7–3.6 V supply.
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 |
| Resolution | 0.0625°C (12-bit); supports fine-grained fan control and safety margining in automotive ECUs |
| Supply voltage | 1.7 V to 3.6 V; compatible with modern low-voltage automotive domains (e.g., 2.5 V, 3.3 V rails) |
| Quiescent current | 27 µA typical at 1 conversion/sec; allows always-on monitoring in battery-sensitive modules |
| Shutdown current | 3 µA typical; reduces parasitic drain during vehicle sleep modes |
| SMBus speed | Up to 2.5 MHz; supports high-throughput thermal telemetry in multi-sensor clusters |
| Package | 8-pin WSON (DQF), 2.00 mm × 2.00 mm; compact footprint with standard reflow compatibility |
Pinout & Package
Package: 8-pin WSON (DQF), 2.00 mm × 2.00 mm, no wettable flanks - RoHS-compliant, lead-free, and qualified per AEC-Q100 Grade 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Power supply input | 1.7–3.6 V main supply; powers internal regulator, ADC, and logic - requires local 100-nF decoupling |
| GND | Ground reference | Analog/digital common return; must be connected to low-impedance system ground plane |
| D+ | Remote sensor positive input | Biased analog input for NPN/PNP diode or substrate transistor; supports series-resistance cancellation |
| D− | Remote sensor negative input | Differential complement to D+; enables rejection of common-mode noise on remote traces |
| THERM | Digital output (open-drain) | Thermal shutdown alert; asserts low when local/remote exceeds programmed limit - requires external pullup |
| ALERT/THERM2 | Digital output (open-drain) | Configurable second alert or THERM duplicate; supports dual-threshold or fault-isolation schemes |
| SCL | SMBus clock input | Master-generated clock; accepts 1 kHz–2.5 MHz; requires external pullup to same V+ domain |
| SDA | SMBus bidirectional data | Open-drain I/O; shares bus with other SMBus slaves; integrates Schmitt trigger and spike suppression |
Key Features
| Feature | Design Value |
|---|---|
| Series resistance cancellation | Compensates up to 1 kΩ trace resistance on remote diode lines - eliminates manual offset trimming |
| Programmable η-factor | Fixed 1.008 value optimized for silicon diodes - ensures accurate remote junction modeling without host software tuning |
| Dual digital filter levels | 4- or 8-sample moving average on remote channel - suppresses burst noise without increasing conversion latency beyond 34 ms |
| Diode fault detection | Identifies open, short, or reverse-biased remote connections - prevents false thermal shutdowns in production systems |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive ECU/TCM/BCM thermal monitoring requirements |
Applications
| ECU Processor Thermal Monitoring | TCM Processor Thermal Monitoring |
|---|---|
Use Scenario: Real-time junction temperature tracking of engine control unit microcontrollers during wide-duty-cycle operation. IC Role / Device Role / Timing Role: Remote temperature sensor interfaced to MCU's built-in thermal diode; local sensor monitors ambient PCB temperature. Use Value: Enables dynamic clock scaling and torque derating before thermal runaway - leveraging ±1°C accuracy and 0.0625°C resolution for precise margin control. |
Use Scenario: Continuous thermal supervision of transmission control module SoCs exposed to under-hood heat soak and transient load spikes. IC Role / Device Role / Timing Role: Dual-channel sensor providing independent local (ambient) and remote (SoC junction) readings via SMBus polling every 100 ms. Use Value: Supports ASIL-B–aligned thermal safety protocols by detecting >125°C violations within <34 ms and asserting THERM for hardware-level shutdown. |
| BCM Processor Thermal Monitoring | LED Headlight Thermal Control |
Use Scenario: Temperature-aware power management in body control modules integrating LIN gateways, CAN transceivers, and power switches. IC Role / Device Role / Timing Role: Local sensor tracks enclosure ambient; remote sensor monitors power IC die temperature using discrete NPN transistor. Use Value: Prevents thermal latch-up in high-current drivers by triggering PWM dimming or load shedding at user-defined thresholds - aided by programmable hysteresis and ALERT violation counting. |
Use Scenario: Closed-loop thermal regulation of automotive LED headlight arrays where junction temperature directly impacts lumen output and lifetime. IC Role / Device Role / Timing Role: Remote sensor bonded to LED driver IC; local sensor monitors heatsink baseplate - both sampled synchronously. Use Value: Maintains consistent photometric performance across –40°C to +85°C ambient by enabling real-time thermal derating - using 0.0625°C resolution to detect sub-degree drift. |
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 correction | Limited to ambient-only monitoring; unsuitable for processor junction sensing or noisy under-hood environments | Select only for cost-sensitive non-automotive ambient sensing where remote capability is unnecessary |
| MAX6642AESA+ | Remote-only sensor; no integrated local sensor; SMBus address conflict risk due to fixed 0x48/0x49 addresses | Requires separate local sensor IC; lacks dual-alert outputs and programmable digital filtering | Use when remote diode monitoring is primary need and board space permits two discrete sensors |
Compared with LM75BIMMX/NOPB and MAX6642AESA+, the TMP451JQDQWRQ1 uniquely integrates local + remote sensing, automotive qualification, series-resistance cancellation, and dual programmable alerts - making it the only option capable of single-chip, AEC-Q100–compliant thermal management for ECU/TCM/BCM processors.
Availability
TMP451JQDQWRQ1 is available at Aetrix Electronics and suitable for automotive ECU thermal monitoring, TCM processor temperature supervision, and BCM power-stage thermal protection requiring stable component supply across extended lifecycle programs.
Supply support for TMP451JQDQWRQ1 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 focused on analog, embedded processing, and connectivity technologies - serving automotive, industrial, and communications markets with high-reliability components.
The TMP451-Q1 product line delivers AEC-Q100–qualified, high-accuracy temperature sensors specifically engineered for automotive subsystems including engine, transmission, and body control units - emphasizing robustness in noisy, thermally demanding environments.
FAQ
What is the operating temperature range of the TMP451JQDQWRQ1?
The TMP451JQDQWRQ1 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 measurement accuracy remains within ±1°C across this full range, and junction temperature is rated up to 150°C. This makes TMP451JQDQWRQ1 suitable for under-hood and powertrain applications where thermal extremes are routine.
Does the TMP451JQDQWRQ1 support remote diode sensing with series resistance compensation?
Yes, the TMP451JQDQWRQ1 includes hardware-based series resistance cancellation that compensates for up to 1 kΩ of trace resistance between the IC and the remote diode sensor. This feature eliminates the need for external calibration or software offset correction - a key differentiator versus basic temperature sensors like the LM75BIMMX/NOPB. The compensation is applied automatically during each remote measurement cycle in TMP451JQDQWRQ1.
What SMBus communication speeds does the TMP451JQDQWRQ1 support?
The TMP451JQDQWRQ1 supports SMBus fast mode (up to 400 kHz) and high-speed mode (up to 2.5 MHz), as confirmed in Section 6.5 of the SLOS877C datasheet. It uses open-drain SDA/SCL pins with integrated Schmitt triggers and spike suppression, ensuring robust communication in electrically noisy automotive environments. The TMP451JQDQWRQ1 does not support SMBus alert response protocol but provides dual interrupt outputs (THERM and ALERT/THERM2) for event-driven monitoring.
How does the digital filter function in the TMP451JQDQWRQ1 improve measurement reliability?
The TMP451JQDQWRQ1 implements a programmable digital filter on its remote temperature channel with two selectable levels: Level 1 applies a 4-sample moving average, and Level 2 applies an 8-sample moving average. This filter operates on raw ADC results before storage in the remote temperature register - reducing the impact of transient noise without altering conversion timing. Both ALERT and THERM limits compare against the filtered result, enhancing immunity to spurious thermal events in TMP451JQDQWRQ1 deployments.
Is the TMP451JQDQWRQ1 pin-compatible with other TI temperature sensors like the TMP411 or TMP421?
No, the TMP451JQDQWRQ1 is not pin-compatible with the TMP411 or TMP421. It uses an 8-pin WSON (DQF) package with a unique pinout - including dedicated D+ and D− inputs for remote sensing, dual open-drain outputs (THERM and ALERT/THERM2), and no dedicated VREF or ALERTn pins found on earlier variants. Migration from TMP411/TMP421 to TMP451JQDQWRQ1 requires PCB layout revision and firmware updates to leverage new features like series-resistance cancellation and programmable η-factor in TMP451JQDQWRQ1.
TMP451JQDQWRQ1 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)
TMP451JQDQWRQ1 FAQ
1.How can I place an order for TMP451JQDQWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP451JQDQWRQ1 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 TMP451JQDQWRQ1 reliable?
The price and inventory of TMP451JQDQWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP451JQDQWRQ1 is usually 5 days.
3.What payment methods are accepted for TMP451JQDQWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP451JQDQWRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP451JQDQWRQ1?
TMP451JQDQWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP451JQDQWRQ1 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 TMP451JQDQWRQ1?
For technical support, including TMP451JQDQWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP451JQDQWRQ1 requirements.
6.How does Aetrix verify that TMP451JQDQWRQ1 is sourced from the original manufacturer or authorized distributors?
All TMP451JQDQWRQ1 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 TMP451JQDQWRQ1 meets industry standards.
7.What is the process for return or replacement of TMP451JQDQWRQ1?
All TMP451JQDQWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TMP451JQDQWRQ1, 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 TMP451JQDQWRQ1 part is unused and in its original packaging.
Return procedure for TMP451JQDQWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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