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Texas Instruments TMP451JQDQWTQ1
- Part No.:
- TMP451JQDQWTQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-WFDFN
- Datasheet:
-
TMP451JQDQWTQ1.pdf
- Description:
- TEMP SENSOR
- Quantity:
- Payment:
- Shipping:
Inventory:4,671
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Product details
Overview
TMP451JQDQWTQ1 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 TMP451JQDQWTQ1 datasheet, TMP451JQDQWTQ1 pinout, TMP451JQDQWTQ1 application, or TMP451JQDQWTQ1 equivalent, key selection criteria include remote diode series-resistance cancellation (up to 1 kΩ), programmable η-factor and offset correction, dual open-drain thermal alert outputs (THERM/ALERT), wettable-flank WSON-8 package for AVI compatibility, and automotive-grade reliability across –40°C to 125°C ambient.
Technical Context
The TMP451JQDQWTQ1 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 or substrate diode (remote), applying real-time series-resistance cancellation and η-factor compensation. Its SMBus interface supports fast mode (400 kHz) and high-speed mode (2.5 MHz) with built-in spike suppression and Schmitt-triggered inputs.
It operates in continuous-conversion or shutdown mode (3 µA typical), with programmable digital filtering (Level 1: 4-sample moving average; Level 2: 8-sample), configurable THERM/ALERT thresholds with hysteresis, and fault detection for open/shorted remote sensors. All registers-including configuration, limits, and status-are accessible via 8-bit slave address 0x4C (default).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy (Local) | ±1°C max over –40°C to 125°C ambient - enables direct replacement of analog thermistors without calibration. |
| Accuracy (Remote) | ±1°C max over –40°C to 100°C ambient & –55°C to 150°C remote junction - validated for microcontroller die thermal monitoring. |
| Resolution | 0.0625°C (12-bit) for both local and remote - supports fine-grained thermal throttling in automotive processors. |
| Supply Range | 1.7 V to 3.6 V - compatible with 1.8 V, 2.5 V, and 3.3 V automotive domain controllers and power rails. |
| Operating Current | 27 µA typical at 1 conversion/sec - allows always-on thermal supervision in low-power ECU sleep modes. |
| Shutdown Current | 3 µA typical - reduces system standby power without sacrificing rapid wake-up capability. |
| SMBus Speed | Up to 2.5 MHz - supports high-throughput thermal polling in multi-sensor vehicle networks. |
| Package | WSON-8 (DQW), 2.50 mm × 2.50 mm with wettable flanks - enables automated optical inspection (AOI) and robust solder-joint reliability. |
Pinout & Package
Package: 8-pin WSON (DQW) with wettable flanks, 2.50 mm × 2.50 mm body size, exposed thermal pad (not electrically connected), RoHS-compliant matte tin finish.
| 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 ceramic decoupling. |
| D+ | Remote sensor positive input | Analog input for PNP/base or NPN/emitter connection; includes series-resistance cancellation circuitry. |
| D− | Remote sensor negative input | Analog input for PNP/emitter or NPN/base; differential pair rejects common-mode noise up to 1000 pF. |
| THERM | Digital output (open-drain) | Configurable thermal shutdown/fan-control signal; active-low, pulled up externally to 1.7–3.6 V. |
| GND | Ground reference | Common return for analog and digital sections; must be low-impedance connection to PCB ground plane. |
| SCL | Serial clock input | Open-drain SMBus clock line; requires external pullup; supports 1 kHz–2.5 MHz timing with Schmitt trigger. |
| SDA | Serial data I/O | Bidirectional open-drain bus line; supports read/write commands and register access per SMBus protocol. |
| ALERT/THERM2 | Dual-function digital output | Programmable second thermal alert; defaults to SMBus ALERT but can be remapped as THERM2 output. |
Key Features
| Feature | Design Value |
|---|---|
| Series resistance cancellation | Compensates up to 1 kΩ trace resistance in remote diode paths - eliminates manual offset trimming in PCB layout. |
| Programmable η-factor | Adjusts ideality factor (default 1.008) to match specific transistor/diode characteristics - improves remote accuracy by >0.5°C. |
| Programmable digital filter | Two-level moving-average filter (4- or 8-sample) suppresses transient noise on D+/D− - prevents false thermal alerts. |
| Diode fault detection | Identifies open-circuit, short-circuit, and reverse-biased conditions on remote inputs - sets OPEN bit in status register. |
| Wettable flanks package | Side-wettable leads enable automated visual inspection (AVI) of solder joints - improves manufacturing yield in automotive SMT lines. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2 kV and CDM ±750 V - meets ISO/TS 16949 requirements. |
Applications
| ECU Processor Thermal Monitoring | LED Headlight Thermal Control |
|---|---|
|
Use Scenario: Real-time junction temperature tracking of automotive engine control unit (ECU) microcontrollers during cold cranking and wide-load transients. IC Role / Device Role / Timing Role: Remote temperature sensor interfaced to substrate diode inside MCU die; local sensor monitors ambient near power stage. Use Value: Enables dynamic clock throttling and safe torque reduction when die temperature exceeds 115°C - prevents thermal runaway without external ADC or firmware overhead. |
Use Scenario: Closed-loop thermal regulation of high-power LED arrays in adaptive front-lighting systems (AFS) under solar loading and ambient extremes. IC Role / Device Role / Timing Role: Local sensor monitors heatsink temperature; remote channel tracks LED junction via external diode on emitter pad. Use Value: Triggers dimming or current derating at 85°C using THERM output - maintains LED lumen output and lifetime within JEDEC JESD57 limits. |
| TCM Processor Temperature Monitoring | BCM Thermal Supervision |
|
Use Scenario: Continuous thermal surveillance of transmission control module (TCM) SoCs during gear-shift sequences and hydraulic pressure modulation. IC Role / Device Role / Timing Role: Dual-channel measurement: local for ambient air near TCM housing; remote for SoC die via integrated transistor. Use Value: Supports ASIL-B compliant thermal diagnostics by logging min/max temperatures and fault events to CAN bus via host MCU - satisfies ISO 26262 diagnostic coverage requirements. |
Use Scenario: Multi-point thermal validation of body control module (BCM) power ICs including LIN transceivers, motor drivers, and LED drivers. IC Role / Device Role / Timing Role: Single TMP451JQDQWTQ1 monitors local ambient and up to three remote locations via shared D+/D− traces with series-resistance cancellation. Use Value: Reduces BOM count vs. discrete NTC solutions while delivering ±1°C accuracy across all zones - simplifies thermal mapping and calibration in production test. |
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. | Limited to ambient monitoring only; unsuitable for processor die or LED junction sensing. | Select only for cost-sensitive cabin ambient sensing where remote capability is unnecessary. |
| MAX6642AESA+ | Remote-only sensor with local reference; ±1.5°C remote accuracy; no wettable flanks; SO-8 package. | Requires external local sensor; lacks integrated local channel and automotive qualification. | Use when remote sensing is primary need and board space allows SO-8; not drop-in for TMP451JQDQWTQ1 footprint. |
Compared with LM75BIMMX/NOPB and MAX6642AESA+, the TMP451JQDQWTQ1 delivers integrated dual-channel precision, automotive qualification, and advanced error-correction features - making it the only option capable of meeting AEC-Q100 Grade 1 requirements for ECU/TCM/BCM thermal management with single-device simplicity.
Availability
TMP451JQDQWTQ1 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 TMP451JQDQWTQ1 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 and automotive qualification.
The TMP451-Q1 product line was engineered specifically for AEC-Q100 Grade 1 automotive subsystems requiring high-accuracy, low-power, dual-channel thermal monitoring - targeting ECU, TCM, BCM, and ADAS domain controllers.
FAQ
What is the default SMBus address for the TMP451JQDQWTQ1?
The TMP451JQDQWTQ1 uses a fixed SMBus slave address of 0x4C (7-bit) by default. This address is hardwired and cannot be changed via pins or registers. The device supports standard SMBus read/write protocols including block read, byte write, and word write operations. All communication occurs over the open-drain SDA and SCL lines with required external pullup resistors to 1.7–3.6 V. The TMP451JQDQWTQ1 does not support address selection via ADDR pin or EEPROM configuration.
Does the TMP451JQDQWTQ1 support remote temperature sensing with PNP transistors?
Yes, the TMP451JQDQWTQ1 supports both PNP and NPN bipolar junction transistors as remote temperature sensors. It applies programmable η-factor correction and series-resistance cancellation optimized for either polarity. For PNP use, connect the emitter to D+ and collector to D−; for NPN, connect collector to D+ and emitter to D−. The TMP451JQDQWTQ1 automatically handles bias current direction and polarity inversion in its internal measurement algorithm - no external circuit changes are needed when switching between PNP and NPN devices.
How does series resistance cancellation work in the TMP451JQDQWTQ1?
The TMP451JQDQWTQ1 performs series resistance cancellation by measuring the voltage drop across D+ and D− at two different current levels (high/medium/low source currents) and calculating the parasitic resistance contribution using a patented algorithm. This eliminates temperature errors caused by PCB trace resistance up to 1 kΩ without requiring calibration or external components. The feature is enabled by default and operates transparently during every remote temperature conversion. It is validated across the full –55°C to 150°C remote junction range and is independent of η-factor or offset settings - ensuring consistent accuracy regardless of routing length or copper weight.
Can the ALERT and THERM outputs of the TMP451JQDQWTQ1 drive external MOSFETs directly?
No, the ALERT and THERM outputs of the TMP451JQDQWTQ1 are open-drain digital outputs rated for 6 mA sink current at 0.4 V, and they require external pullup resistors to 1.7–3.6 V. They are not designed to drive MOSFET gates directly due to limited voltage swing and current capability. To control external MOSFETs, interface these outputs through a level-shifting buffer or dedicated gate driver IC. The TMP451JQDQWTQ1 datasheet explicitly prohibits direct connection to MOSFET gates and specifies that external pullups must be placed between the output pin and the target supply rail - confirming that the outputs serve as logic-level interrupt signals, not power switches.
Is the TMP451JQDQWTQ1 pin-compatible with the TMP451AQDQWTQ1?
Yes, the TMP451JQDQWTQ1 and TMP451AQDQWTQ1 share identical pinout, package (WSON-8 DQW), and electrical interface - both are functionally identical except for AEC-Q100 qualification grade. The "J" suffix denotes Grade 1 (–40°C to 125°C), while "A" denotes Grade 0 (–40°C to 150°C junction). All registers, timing, and feature sets are identical. However, the TMP451JQDQWTQ1 is qualified per AEC-Q100 Rev G with full automotive test reports, whereas the "A" variant is not automotive-qualified. For automotive production, only the "J" version is approved - the "A" part may be used in non-automotive designs where higher junction temperature is required.
TMP451JQDQWTQ1 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)
TMP451JQDQWTQ1 FAQ
1.How can I place an order for TMP451JQDQWTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP451JQDQWTQ1 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 TMP451JQDQWTQ1 reliable?
The price and inventory of TMP451JQDQWTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP451JQDQWTQ1 is usually 5 days.
3.What payment methods are accepted for TMP451JQDQWTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP451JQDQWTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP451JQDQWTQ1?
TMP451JQDQWTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP451JQDQWTQ1 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 TMP451JQDQWTQ1?
For technical support, including TMP451JQDQWTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP451JQDQWTQ1 requirements.
6.How does Aetrix verify that TMP451JQDQWTQ1 is sourced from the original manufacturer or authorized distributors?
All TMP451JQDQWTQ1 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 TMP451JQDQWTQ1 meets industry standards.
7.What is the process for return or replacement of TMP451JQDQWTQ1?
All TMP451JQDQWTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TMP451JQDQWTQ1, 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 TMP451JQDQWTQ1 part is unused and in its original packaging.
Return procedure for TMP451JQDQWTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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