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Texas Instruments TMP451JQDQFRQ1
- Part No.:
- TMP451JQDQFRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-WFDFN
- Datasheet:
-
TMP451JQDQFRQ1.pdf
- Description:
- IC TEMP SENSOR
- Quantity:
- Payment:
- Shipping:
Inventory:1,097
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Product details
Overview
TMP451JQDQFRQ1 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 TMP451JQDQFRQ1 datasheet, TMP451JQDQFRQ1 pinout, TMP451JQDQFRQ1 application, or TMP451JQDQFRQ1 equivalent, key selection criteria include remote diode series-resistance cancellation (up to 1 kΩ), programmable η-factor and offset correction, dual digital filter levels, diode fault detection, and wettable-flank WSON-8 (DQF) packaging for automated optical inspection.
Technical Context
The TMP451JQDQFRQ1 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 or substrate diode (remote), using current-source excitation at three selectable levels (7.5 µA / 45 µA / 120 µA). It applies real-time series resistance cancellation and η-factor compensation before storing results in dedicated high/low byte registers.
Its SMBus slave interface supports Fast Mode (≤400 kHz) and High-Speed Mode (≤2.5 MHz), with built-in Schmitt triggers, spike suppression, and programmable ALERT/THERM2 interrupt behavior - including configurable violation count thresholds (1–4 consecutive limit breaches) and hysteresis-controlled thermal shutdown outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local/Remote Accuracy | ±1°C max over –40°C to 125°C ambient; enables direct replacement of legacy ±2°C sensors without derating. |
| Resolution | 0.0625°C (12-bit); allows precise fan-speed ramping and LED dimming control based on sub-degree thermal gradients. |
| Supply Range | 1.7 V to 3.6 V; interoperable with 1.8 V, 2.5 V, and 3.3 V automotive domain controllers without level-shifting. |
| Quiescent Current | 27 µA typical at 1 conversion/sec; supports always-on thermal monitoring in low-power ECU sleep modes. |
| Series Resistance Cancellation | Up to 1 kΩ; eliminates calibration overhead for PCB trace resistance in under-hood remote sensor routing. |
| Digital Filter | Programmable 4-sample or 8-sample moving average on remote channel; suppresses noise from adjacent high-speed digital signals. |
| Package | 8-pin WSON (DQF), 2.00 mm × 2.00 mm with wettable flanks; enables AOI-compatible solder joint verification in SMT lines. |
Pinout & Package
Package: 8-pin WSON (DQF), 2.00 mm × 2.00 mm, wettable flanks, exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Power supply input | Accepts 1.7–3.6 V; powers internal regulator, ADC, and SMBus I/O; requires local 100-nF ceramic decoupling. |
| D+ | Remote sensor positive terminal | Analog input for PNP emitter or NPN collector; biased with programmable current source (7.5/45/120 µA). |
| D− | Remote sensor negative terminal | Analog input referenced to D+; differential measurement rejects common-mode noise up to 1000 pF capacitance. |
| THERM | Digital output (open-drain) | Configurable thermal alert/fan-control signal; asserts when local or remote exceeds THERM limit minus hysteresis. |
| GND | Ground reference | Return path for V+, D+/D−, and digital I/O; must be low-impedance connection to system ground plane. |
| SCL | SMBus clock input | Open-drain input requiring external pullup (1.7–3.6 V); accepts 1 kHz–2.5 MHz clock; includes Schmitt trigger. |
| SDA | SMBus data I/O | Bidirectional open-drain line; requires same pullup voltage as SCL; supports read/write register access and alert polling. |
| ALERT/THERM2 | Dual-function digital output | Second open-drain interrupt; configurable as independent THERM2 or SMBus alert; shares same pullup constraints. |
Key Features
| Feature | Design Value |
|---|---|
| η-Factor and Offset Correction | Per-device programmable ideality factor (default 1.008) and remote offset register enable matching to non-ideal diodes (e.g., FPGA substrate transistors) without external calibration. |
| Diode Fault Detection | Real-time open-circuit, short-circuit (–64°C return), and reverse-bias detection on D+; sets OPEN bit in status register to prevent false thermal alarms. |
| Programmable Digital Filter | Two-stage software-selectable filtering (4- or 8-sample moving average) applied exclusively to remote channel result register - preserving raw local data for fast response. |
| Wettable Flank Packaging | DQF package exposes solderable sidewalls on all 8 pins, enabling automated visual inspection (AVI) of reflow quality without X-ray. |
| AEC-Q100 Grade 1 Qualification | Validated for –40°C to +125°C ambient operation with HBM ±2000 V and CDM ±750 V (corner pins); meets automotive reliability and lifetime requirements. |
Applications
| Automotive Infotainment SoC Thermal Management | ECU Processor Core Temperature Monitoring |
|---|---|
Use Scenario: Real-time die temperature tracking of application processors (e.g., TI Jacinto, NXP i.MX) in head units to throttle performance before thermal throttling or shutdown. IC Role / Device Role / Timing Role: Local sensor measures SoC package temperature; remote channel monitors discrete thermal diode on power management IC; SMBus updates every 34 ms. Use Value: Enables dynamic DVFS control with ±1°C accuracy, reducing unnecessary frequency scaling and maintaining UI responsiveness under thermal stress. | Use Scenario: Continuous core temperature supervision of engine control unit MCUs (e.g., ST SPC5, Infineon AURIX) during cold-start and wide-load transient conditions. IC Role / Device Role / Timing Role: Remote diode mounted on MCU substrate; local sensor monitors ambient near ECU housing; ALERT triggers fan activation at 105°C with 5°C hysteresis. Use Value: Prevents latent thermal runaway by detecting localized hotspots before silicon degradation occurs, meeting ISO 26262 ASIL-B diagnostic coverage targets. |
| TCM Transmission Control Module Diode Sensing | LED Headlight Driver Thermal Protection |
Use Scenario: Monitoring junction temperature of power MOSFETs in automatic transmission valve-body drivers to prevent torque converter clutch overheating. IC Role / Device Role / Timing Role: Remote diode placed thermally coupled to gate driver IC; series resistance cancellation compensates for 650 Ω PCB trace; digital filter suppresses PWM switching noise. Use Value: Eliminates need for manual offset tables per board variant, cutting validation time by >40% across TCM SKUs. | Use Scenario: Closed-loop thermal regulation of high-brightness LED arrays in adaptive driving beam (ADB) modules to maintain lumen output and color stability. IC Role / Device Role / Timing Role: Local sensor tracks heatsink baseplate; remote diode embedded in LED COB substrate; THERM output directly gates boost converter enable. Use Value: Extends LED lifetime by limiting junction temperature to ≤115°C even during sustained full-beam operation in desert climates. |
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 diode channel, no series resistance cancellation, no η-factor tuning; ±2°C accuracy over 0°C–70°C only. | Restricted to ambient cabin temperature monitoring; unsuitable for processor or power stage junction sensing. | Select only for cost-sensitive non-automotive applications where remote sensing is unnecessary and grade-1 qualification is not required. |
| MAX6642AUB+ | Remote-only dual-diode sensor; no local channel; ±1.5°C remote accuracy; fixed 1.000 η-factor; no programmable digital filter. | Lacks on-chip reference for self-calibration; requires external local sensor for multi-point correlation. | Choose when monitoring multiple remote nodes (e.g., battery cell temps) without need for local reference or automotive qualification. |
Compared with LM75BIMMX/NOPB and MAX6642AUB+, the TMP451JQDQFRQ1 uniquely delivers simultaneous local/remote measurement with automotive-grade accuracy, on-the-fly series resistance compensation, and dual-stage digital filtering - making it the only option qualified for direct integration into ASIL-B thermal safety chains without external redundancy.
Availability
TMP451JQDQFRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, ECU thermal management, and LED headlight control requiring stable component supply across extended production lifecycles.
Supply support for TMP451JQDQFRQ1 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, industrial, and communications markets.
The TMP451-Q1 product line was designed specifically for high-reliability automotive thermal monitoring, addressing the need for accurate, noise-immune, and AEC-Q100-compliant temperature sensing in ECUs, TCUs, and ADAS subsystems.
FAQ
What is the maximum series resistance that TMP451JQDQFRQ1 can cancel?
The TMP451JQDQFRQ1 supports series resistance cancellation up to 1 kΩ on the remote diode path. This capability eliminates measurement error caused by PCB trace resistance or external RC filter components, allowing direct use of long sensor traces without manual offset calibration. The cancellation is performed automatically in hardware during each remote temperature conversion cycle, and is confirmed in Figure 6-5 of the official datasheet (SLOS877C).
Does TMP451JQDQFRQ1 support both local and remote temperature sensing simultaneously?
Yes, the TMP451JQDQFRQ1 integrates two independent sensing channels: a local thermal transistor for on-chip temperature measurement and a remote diode interface for external PNP/NPN transistors or substrate diodes. Both channels operate concurrently, with 0.0625°C resolution and ±1°C accuracy over –40°C to 125°C. Their results are stored in separate 16-bit registers and can be read independently via SMBus.
What package type is used for TMP451JQDQFRQ1, and why does it matter for automotive manufacturing?
TMP451JQDQFRQ1 uses the 8-pin WSON (DQF) package, measuring 2.00 mm × 2.00 mm with wettable flanks. This design exposes solderable sidewalls on all pins, enabling automated optical inspection (AOI) of solder joint quality post-reflow - a critical requirement for zero-defect automotive SMT lines. It eliminates reliance on costly X-ray inspection for hidden joint verification.
Can TMP451JQDQFRQ1 detect faults in the remote diode connection?
Yes, TMP451JQDQFRQ1 includes integrated diode fault detection that identifies open circuits, short circuits (returning –64°C), and reverse-biased connections on the D+ pin. During each conversion, a comparator monitors D+ voltage relative to V+; if it exceeds (V+) – 0.3 V, the OPEN bit (bit 2) in the status register is set. This prevents false thermal alerts and supports safe fail-operational behavior in ASIL-B designs.
What SMBus communication speeds does TMP451JQDQFRQ1 support?
TMP451JQDQFRQ1 supports SMBus Fast Mode (up to 400 kHz) and High-Speed Mode (up to 2.5 MHz), with built-in Schmitt triggers and spike suppression on SDA/SCL lines. Timing parameters - including tLOW, tHIGH, and bus free time - are fully specified in Section 6.6 of the datasheet. The device operates only as a slave and requires external pull-up resistors compatible with its 1.7–3.6 V supply range.
TMP451JQDQFRQ1 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)
TMP451JQDQFRQ1 FAQ
1.How can I place an order for TMP451JQDQFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP451JQDQFRQ1 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 TMP451JQDQFRQ1 reliable?
The price and inventory of TMP451JQDQFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP451JQDQFRQ1 is usually 5 days.
3.What payment methods are accepted for TMP451JQDQFRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP451JQDQFRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP451JQDQFRQ1?
TMP451JQDQFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP451JQDQFRQ1 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 TMP451JQDQFRQ1?
For technical support, including TMP451JQDQFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP451JQDQFRQ1 requirements.
6.How does Aetrix verify that TMP451JQDQFRQ1 is sourced from the original manufacturer or authorized distributors?
All TMP451JQDQFRQ1 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 TMP451JQDQFRQ1 meets industry standards.
7.What is the process for return or replacement of TMP451JQDQFRQ1?
All TMP451JQDQFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TMP451JQDQFRQ1, 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 TMP451JQDQFRQ1 part is unused and in its original packaging.
Return procedure for TMP451JQDQFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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