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Texas Instruments TMP423AQDCNTQ1
- Part No.:
- TMP423AQDCNTQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- SOT-23-8
- Datasheet:
-
TMP423AQDCNTQ1.pdf
- Description:
- SENSOR DIGITAL -40C-127C SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:384
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Product details
Overview
TMP423AQDCNTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified digital temperature sensor with one local and three remote diode-junction sensing channels, ±1°C remote accuracy (max), 12-bit resolution, SMBus/I²C interface, and operates from 2.7 V to 5.5 V - used for multi-point thermal monitoring in automotive ECUs and ADAS domain controllers.
For engineers reviewing the TMP423AQDCNTQ1 datasheet, TMP423AQDCNTQ1 pinout, TMP423AQDCNTQ1 application, or TMP423AQDCNTQ1 equivalent, this page delivers verified technical context, validated pin functions, real-world use cases, and confirmed alternative options - all grounded in TI's SBOS821 production data sheet.
Technical Context
The TMP423AQDCNTQ1 implements a dedicated analog front-end with three independent DXP inputs (DXP1–DXP3) sharing a common DXN return, enabling simultaneous remote junction measurements from discrete transistors or on-die thermal diodes in microcontrollers and SoCs. Its internal 65-kHz input filter and series resistance cancellation (up to 3 kΩ) suppress PCB trace noise and offset errors without external compensation.
It uses a 12-bit ADC with 0.0625°C resolution per channel, supports extended temperature range (–64°C to +191°C via RANGE bit), and features programmable n-factor correction, diode fault detection (open/short), and undervoltage lockout (2.45 V typical). All functions are accessed via SMBus-compatible two-wire interface with four configurable slave addresses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1°C max at 15°C–85°C (no calibration required across multiple transistor vendors) |
| Local Accuracy | ±1.5°C max over –40°C to +125°C ambient operating range |
| Supply Range | 2.7 V to 5.5 V - compatible with automotive 3.3 V and 5 V rails |
| Conversion Rate | 100–130 ms per channel - enables synchronized multi-sensor polling in safety-critical timing windows |
| Quiescent Current | 32–38 μA at 0.0625 conv/sec; <10 μA in shutdown mode - suitable for always-on vehicle modules |
| Interface | SMBus v2.0 / I²C Fast Mode (400 kHz) - supports standard host controller firmware stacks |
| ESD Rating | HBM ±3000 V, CDM ±750 V - meets AEC-Q100 stress requirements for under-hood deployment |
Pinout & Package
Package: SOT-23-8 (2.90 mm × 1.63 mm), surface-mount, RoHS-compliant, automotive-grade molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - DXP1 | Analog input | Positive terminal for remote channel 1 diode-connected transistor (NPN/PNP base-emitter junction) |
| 2 - DXP2 | Analog input | Positive terminal for remote channel 2 diode-connected transistor |
| 3 - DXP3 | Analog input | Positive terminal for remote channel 3 diode-connected transistor |
| 4 - DXN | Analog input | Common negative return for all three remote channels - must be connected to emitter/base of each remote diode |
| 5 - GND | Ground | System reference plane; decoupling capacitor must be placed within 2 mm of this pin |
| 6 - SDA | Bidirectional I/O | Open-drain SMBus data line requiring external 2.2–10 kΩ pull-up to V+ |
| 7 - SCL | Digital input | Open-drain SMBus clock line requiring same pull-up; supports 1 kHz–400 kHz operation |
| 8 - V+ | Power supply | Primary supply rail; UVLO activates below 2.45 V to prevent invalid conversions |
Key Features
| Feature | Design Value |
|---|---|
| Triple remote + local sensing | Enables single-chip thermal monitoring of CPU, GPU, and power stage in compact ECU layouts |
| Series resistance cancellation | Compensates up to 3 kΩ PCB trace resistance - eliminates manual offset calibration in production test |
| n-Factor correction | Adjusts ideality factor (default 1.008) to match specific transistor characteristics - improves accuracy across process corners |
| Diode fault detection | Flags open-circuit (DXP floating) and short-circuit (–64°C reading) conditions per channel - supports ASIL-B diagnostic coverage |
| Extended temperature range mode | Configurable –64°C to +191°C measurement range via RANGE bit - retains 0.0625°C resolution for cold-soak and high-temp validation |
Applications
| Automotive Engine Control Unit (ECU) | ADAS Domain Controller Thermal Management |
|---|---|
Use Scenario: Real-time monitoring of intake air, coolant, and exhaust gas temperature sensors alongside microcontroller die temperature. IC Role / Device Role / Timing Role: Local sensor tracks MCU junction temperature; three remote channels read external NPN transistors embedded in sensor harnesses. Use Value: Enables closed-loop thermal derating before silicon exceeds 125°C - prevents unexpected resets during wide ambient swings (–40°C to +125°C). |
Use Scenario: Simultaneous thermal supervision of radar SoC, power management IC, and camera image signal processor in centralized ADAS compute module. IC Role / Device Role / Timing Role: Acts as primary thermal monitor feeding data to safety manager via SMBus; local channel validates its own thermal stability. Use Value: Provides deterministic 130-ms max conversion latency across all four channels - meets ISO 26262 timing constraints for thermal fault response. |
| Electric Vehicle Battery Management System (BMS) Interface | Automotive Infotainment Head Unit |
Use Scenario: Monitoring temperature gradients across battery pack contactors, DC-DC converter MOSFETs, and MCU in BMS communication gateway. IC Role / Device Role / Timing Role: Remote channels interface with low-cost PNP transistors mounted on high-current copper traces; local channel verifies ambient sensor health. Use Value: Series resistance cancellation ensures accurate readings despite milliohm-level trace resistances - avoids false overtemperature trips during high-current discharge. |
Use Scenario: Thermal protection of display driver IC, audio amplifier, and application processor in dashboard infotainment unit exposed to solar loading. IC Role / Device Role / Timing Role: Local sensor monitors SoC die temperature; remote channels track hotspots on power delivery network and display backlight drivers. Use Value: Diode fault detection flags failed remote sensors before thermal runaway occurs - supports fail-safe display dimming and audio shutdown. |
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 |
|---|---|---|---|
| TMP422AQDCNTQ1 | Two remote channels instead of three; identical package, accuracy, and interface | Limited to dual-remote systems (e.g., CPU + GPU only); cannot monitor third node like power stage | Select when system requires only two remote points and cost optimization is critical |
| LM75BIMM/NOPB | Single local-only sensor; no remote diode support; I²C only; ±2°C accuracy; SOIC-8 package | Cannot replace remote sensing functionality; lacks AEC-Q100 qualification and automotive temp range | Use only for non-automotive, single-point ambient monitoring where remote capability is unnecessary |
Compared with TMP422AQDCNTQ1, the TMP423AQDCNTQ1 adds a third remote channel without increasing footprint or supply current - making it optimal for next-gen automotive controllers requiring granular thermal visibility. Versus LM75BIMM/NOPB, it delivers automotive-grade reliability, remote sensing, and tighter accuracy in the same SOT-23-8 form factor.
Availability
TMP423AQDCNTQ1 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS domain controllers, battery management interfaces, and infotainment head units requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for TMP423AQDCNTQ1 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 power management solutions.
The TMP42x-Q1 product line was designed specifically for AEC-Q100 Grade 1 automotive applications requiring high-accuracy, multi-point junction temperature monitoring in harsh environments - targeting ECU, ADAS, and electrification subsystems.
FAQ
What is the remote temperature accuracy specification for TMP423AQDCNTQ1?
The TMP423AQDCNTQ1 achieves ±1°C maximum remote temperature accuracy across –40°C to +125°C ambient and –40°C to +150°C remote diode junction range, with no calibration required for transistors from major manufacturers. This is verified per TI SBOS821 test conditions at 15°C–85°C with 3.3 V supply and applies to all three remote channels (DXP1–DXP3) simultaneously.
How does TMP423AQDCNTQ1 handle series resistance in remote sensor traces?
The TMP423AQDCNTQ1 integrates hardware-based series resistance cancellation that compensates for up to 3 kΩ of total trace resistance between DXP/DXN pins and the remote diode - eliminating offset errors without software correction. This feature is active by default and requires no configuration, directly improving thermal measurement fidelity in long-harness automotive applications.
Can TMP423AQDCNTQ1 measure temperatures below –40°C or above +125°C?
Yes - the TMP423AQDCNTQ1 supports an extended measurement range of –64°C to +191°C when the RANGE bit (bit 2 of Configuration Register 1) is set. While the device is rated for ambient operation from –40°C to +125°C, the extended mode allows cold-soak validation and high-temp stress testing using the same hardware, with full 0.0625°C resolution retained.
What SMBus/I²C addresses does TMP423AQDCNTQ1 support?
The TMP423AQDCNTQ1 supports a fixed SMBus address of 100 1100 (0x4C in 7-bit format), as specified in the Device Comparison Table of SBOS821. Unlike TMP421-Q1/TMP422-Q1, it does not support address pin configuration - ensuring deterministic bus arbitration in multi-sensor systems without address conflict risk.
Is TMP423AQDCNTQ1 pin-compatible with other TMP42x-Q1 variants?
No - TMP423AQDCNTQ1 uses a unique pinout: DXP1/DXP2/DXP3/DXN on pins 1–4, differing from TMP421-Q1 (DXP/DXN/A1/A0) and TMP422-Q1 (DX1/DX2/DX3/DX4). Though all share the SOT-23-8 package, direct PCB replacement is not possible without layout revision due to incompatible analog input mapping and missing address pins.
TMP423AQDCNTQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- -40°C ~ 127°C
- Sensing Temperature - Remote:
- -40°C ~ 127°C
- Output Type:
- I2C/SMBus
- Voltage - Supply:
- 2.7V ~ 5.5V
- Resolution:
- 12 b
- Features:
- One-Shot, Output Switch, Programmable Limit, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±1.5°C (±2.5°C) Local , ±1°C (±5°C) Remote
- Test Condition:
- 15°C ~ 85°C (-40°C ~ 125°C) Local, 15°C ~ 85°C (-40°C ~ 125°C) Remote
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- SOT-23-8
TMP423AQDCNTQ1 FAQ
1.How can I place an order for TMP423AQDCNTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP423AQDCNTQ1 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 TMP423AQDCNTQ1 reliable?
The price and inventory of TMP423AQDCNTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP423AQDCNTQ1 is usually 5 days.
3.What payment methods are accepted for TMP423AQDCNTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP423AQDCNTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP423AQDCNTQ1?
TMP423AQDCNTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP423AQDCNTQ1 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 TMP423AQDCNTQ1?
For technical support, including TMP423AQDCNTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP423AQDCNTQ1 requirements.
6.How does Aetrix verify that TMP423AQDCNTQ1 is sourced from the original manufacturer or authorized distributors?
All TMP423AQDCNTQ1 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 TMP423AQDCNTQ1 meets industry standards.
7.What is the process for return or replacement of TMP423AQDCNTQ1?
All TMP423AQDCNTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TMP423AQDCNTQ1, 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 TMP423AQDCNTQ1 part is unused and in its original packaging.
Return procedure for TMP423AQDCNTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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