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Texas Instruments TMP423AIDCNTG4
- Part No.:
- TMP423AIDCNTG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- SOT-23-8
- Datasheet:
-
TMP423AIDCNTG4.pdf
- Description:
- SENSOR DIGITAL -40C-125C SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
TMP423AIDCNTG4 from Texas Instruments is a triple-channel remote/local temperature sensor IC with SMBus interface, ±1°C remote diode accuracy (max), 12-bit resolution per channel, and SOT23-8 package. It measures one local die temperature and three independent remote junctions (e.g., CPU, GPU, VRM) in server and telecom thermal management systems.
For engineers reviewing the TMP423AIDCNTG4 datasheet, TMP423AIDCNTG4 pinout, TMP423AIDCNTG4 application, or TMP423AIDCNTG4 equivalent, key selection criteria include remote channel count, SMBus address configurability (A0/A1), series resistance cancellation up to 3 kΩ, and extended temperature range support (–64°C to +191°C).
Technical Context
The TMP423AIDCNTG4 implements a dedicated delta-sigma ADC per remote channel and a shared local sensor ADC, all synchronized under a single conversion engine. Its series resistance cancellation algorithm dynamically compensates for PCB trace resistance on DXP1/DXP2/DXP3–DXN paths without external calibration.
It supports programmable n-factor correction per remote channel, SMBus timeout (25–35 ms), and configurable conversion rates from 0.0625 to 8 conversions/sec. The device uses a common DXN terminal for all three remote sensors, enabling compact layout while maintaining independent channel accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1°C max at +15°C to +85°C ambient, tested across multiple IC manufacturers - no per-unit calibration required. |
| Local Accuracy | ±1.5°C max over –40°C to +125°C - sufficient for die-temperature monitoring of processors and FPGAs. |
| Resolution | 12-bit for all channels (1°C high-byte + 0.0625°C low-byte) - enables precise thermal throttling thresholds. |
| Supply Range | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V system rails without level-shifting. |
| Quiescent Current | 32–38 μA at 0.0625 conv/sec - enables always-on thermal monitoring in power-constrained systems. |
| SMBus Clock | Up to 3.4 MHz - supports fast polling in multi-sensor thermal control loops. |
| Series R Cancellation | Up to 3 kΩ - eliminates measurement offset from long PCB traces to remote diodes. |
Pinout & Package
SOT23-8 package (DCN designation), 2.9 mm × 1.6 mm × 1.0 mm body, gull-wing leads, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: DXP1 | Positive input for remote channel 1 | Connects to collector/emitter of PNP/NPN transistor or anode of diode - forms first remote sensing pair with DXN. |
| 2: DXP2 | Positive input for remote channel 2 | Independent remote sense path; shares DXN return - requires separate discrete diode/transistor. |
| 3: DXP3 | Positive input for remote channel 3 | Third independent remote input; enables full-board thermal mapping without additional ICs. |
| 4: DXN | Common negative input for all remote channels | Single return node for DXP1–DXP3 - reduces routing complexity vs. fully differential implementations. |
| 5: GND | Analog/digital ground reference | Must be connected to low-impedance system ground plane; decoupling capacitor required near V+ and GND pins. |
| 6: SDA | SMBus data line (open-drain) | Requires external pull-up to V+; supports multi-drop bus with other SMBus devices. |
| 7: SCL | SMBus clock line (open-drain) | Shared clock with other SMBus peripherals; timing compliant with 3.4 MHz high-speed mode. |
| 8: V+ | Positive supply input | Accepts 2.7–5.5 V; internal UVLO (2.3–2.6 V) prevents erroneous readings during brownout. |
Key Features
| Feature | Design Value |
|---|---|
| Triple remote + local sensing | Measures CPU, memory, and VRM temperatures with one IC - reduces BOM count and board area vs. dual-sensor solutions. |
| Programmable n-factor correction | Adjusts ideality factor (η = 1.008 default) per channel to match specific transistor/diode characteristics - improves accuracy across process variations. |
| Diode fault detection | Flags open/short conditions on any DXP–DXN path - enables fail-safe thermal shutdown in mission-critical systems. |
| Extended temperature range mode | Configurable via RANGE bit to support –64°C to +191°C (offset binary format) - covers cryogenic and high-temp industrial use cases. |
| Multiple SMBus addresses | A0/A1 pins allow four unique slave addresses (1001100 to 1001111) - supports up to four TMP423 devices on same bus without address conflict. |
Applications
| Processor/FPGA Thermal Monitoring | Server Blade Temperature Management |
|---|---|
Use Scenario: Real-time monitoring of CPU die, GPU junction, and voltage regulator MOSFET temperatures in a 1U rack server. IC Role / Device Role / Timing Role: Local sensor reads SoC die temperature; DXP1–DXP3 monitor discrete transistors on VRM, memory buffer, and chipset - all sampled synchronously every 125 ms. Use Value: Enables dynamic fan speed control and thermal throttling with <±1°C remote accuracy - reduces acoustic noise and extends component lifetime. | Use Scenario: Distributed thermal sensing across compute, storage, and I/O modules in a blade chassis with shared SMBus backbone. IC Role / Device Role / Timing Role: Each blade uses one TMP423AIDCNTG4 to report local + three remote temps via unique SMBus address (set by A0/A1 straps) to central BMC. Use Value: Eliminates need for multiple dual-channel sensors - cuts interconnect count by 40% and simplifies firmware thermal policy logic. |
| LCD/DLP Projector Lamp Thermal Control | Central Office Telecom Equipment |
Use Scenario: Closed-loop thermal regulation of high-power UHP lamp and color wheel motor in commercial projector. IC Role / Device Role / Timing Role: DXP1 monitors lamp cathode transistor; DXP2 tracks color wheel driver IC; DXP3 reads heatsink thermistor - all referenced to common DXN. Use Value: Prevents lamp explosion risk by triggering shutdown at +110°C with <±1°C repeatability - meets IEC 62368-1 safety requirements. | Use Scenario: Ambient and component-level temperature supervision in carrier-grade DSLAM and OLT line cards operating at –5°C to +55°C. IC Role / Device Role / Timing Role: Local sensor tracks card ambient; DXP1–DXP3 monitor ASIC, laser driver, and power converter junctions - data polled every 2 sec via SMBus. Use Value: Supports NEBS Level 3 compliance with –40°C to +70°C extended operation mode - ensures reliability in uncontrolled telco closets. |
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 |
|---|---|---|---|
| TMP422AIDCNT | Dual remote channels only; identical SMBus interface, accuracy, and SOT23-8 package. | Insufficient for 3-remote-node systems; requires second IC for full coverage. | Select when only two remote points (e.g., CPU + memory) need monitoring - lower cost and power. |
| LM95235CIMMX | Two remote + one local channels; SPI interface only; ±1.5°C remote accuracy; MSOP-8 package. | Not SMBus-compatible; requires SPI host redesign; lower remote accuracy limits precision thermal control. | Choose for SPI-based microcontrollers where SMBus is unavailable - verify SPI timing margins at 3.4 MHz equivalent rate. |
Compared with TMP422AIDCNT and LM95235CIMMX, the TMP423AIDCNTG4 uniquely delivers three independent remote measurements over SMBus in SOT23-8, enabling single-chip thermal visibility across complex multi-die systems without bus arbitration or layout compromise.
Availability
TMP423AIDCNTG4 is available at Aetrix Electronics and suitable for processor thermal monitoring, server blade management, and telecom equipment requiring stable component supply and long-term lifecycle support.
Supply support for TMP423AIDCNTG4 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 connectivity technologies, with decades of expertise in precision sensing and industrial-grade IC design.
The TMP42x family was engineered for high-accuracy, multi-point thermal management in space-constrained computing and communications infrastructure - prioritizing SMBus compatibility, calibration-free operation, and robust remote diode sensing.
FAQ
What is the SMBus address configuration for TMP423AIDCNTG4?
The TMP423AIDCNTG4 uses pins A0 and A1 to set its 7-bit SMBus slave address. With both pins grounded, the address is 1001100 (0x4C). Pulling A0 high sets 1001101 (0x4D); A1 high sets 1001110 (0x4E); both high sets 1001111 (0x4F). This allows up to four TMP423AIDCNTG4 devices on one bus without collision. All addresses are fixed and non-programmable in hardware.
Does TMP423AIDCNTG4 support extended temperature range operation?
Yes, TMP423AIDCNTG4 supports extended range mode via the RANGE bit (bit 2) in Configuration Register 1. When set, the device reports temperatures from –64°C to +191°C using offset binary format (e.g., –64°C = 0x00, +191°C = 0xFF). The local and remote channels both operate in this mode, though the IC's specified ambient range remains –40°C to +125°C per Absolute Maximum Ratings.
How does series resistance cancellation work on TMP423AIDCNTG4?
TMP423AIDCNTG4 performs automatic series resistance cancellation by applying two different current sources to the DXP–DXN path and measuring the resulting voltage difference. This algorithm removes offset errors caused by PCB trace resistance up to 3 kΩ, eliminating the need for manual calibration or external compensation components. It operates transparently during normal temperature conversions and requires no user configuration.
Can unused remote channels on TMP423AIDCNTG4 be left floating?
No, unused remote channels on TMP423AIDCNTG4 must not be left floating. Per TI SBOS398C, DXP1, DXP2, or DXP3 pins for inactive channels should be tied to GND or left open only if explicitly confirmed safe in the target application. Best practice is to connect unused DXP pins to GND through a 10-kΩ resistor to prevent noise coupling and ensure stable bias - DXN remains connected as the common return regardless of channel usage.
What is the conversion time per channel for TMP423AIDCNTG4?
The TMP423AIDCNTG4 requires 100–130 ms per channel for a full temperature conversion, depending on supply voltage and operating conditions. With three remote channels plus local, a complete acquisition cycle takes approximately 400–520 ms in default continuous mode. Conversion rate is adjustable from 0.0625 to 8 conversions/sec via the Conversion Rate Register (pointer 0Bh), allowing trade-offs between update latency and power consumption.
TMP423AIDCNTG4 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 ~ 125°C
- Sensing Temperature - Remote:
- -64°C ~ 191°C
- Output Type:
- SMBus
- Voltage - Supply:
- 2.7V ~ 5.5V
- Resolution:
- 11 b
- Features:
- One-Shot, Output Switch, Programmable Limit, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±1.5°C (±2.5°C)
- Test Condition:
- 15°C ~ 85°C (-40°C ~ 125°C)
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-8
TMP423AIDCNTG4 FAQ
1.How can I place an order for TMP423AIDCNTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP423AIDCNTG4 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 TMP423AIDCNTG4 reliable?
The price and inventory of TMP423AIDCNTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP423AIDCNTG4 is usually 5 days.
3.What payment methods are accepted for TMP423AIDCNTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP423AIDCNTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP423AIDCNTG4?
TMP423AIDCNTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP423AIDCNTG4 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 TMP423AIDCNTG4?
For technical support, including TMP423AIDCNTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP423AIDCNTG4 requirements.
6.How does Aetrix verify that TMP423AIDCNTG4 is sourced from the original manufacturer or authorized distributors?
All TMP423AIDCNTG4 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 TMP423AIDCNTG4 meets industry standards.
7.What is the process for return or replacement of TMP423AIDCNTG4?
All TMP423AIDCNTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TMP423AIDCNTG4, 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 TMP423AIDCNTG4 part is unused and in its original packaging.
Return procedure for TMP423AIDCNTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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