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Texas Instruments TMP423AIDCNT
- Part No.:
- TMP423AIDCNT
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- SOT-23-8
- Datasheet:
-
TMP423AIDCNT.pdf
- Description:
- SENSOR DIGITAL -40C-125C SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,392
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Product details
Overview
TMP423AIDCNT from Texas Instruments is a triple-channel remote/local temperature sensor IC with one local and three remote diode junction sensing channels, ±1°C remote accuracy (max), 12-bit resolution, SMBus 2-wire interface, and SOT23-8 package - used for multi-point thermal monitoring in server CPU/GPU and FPGA power domains.
For engineers reviewing the TMP423AIDCNT datasheet, TMP423AIDCNT pinout, TMP423AIDCNT application, or TMP423AIDCNT equivalent, key selection criteria include remote channel count (3), SMBus address configurability (A0/A1), series resistance cancellation up to 3 kΩ, and extended temperature range support (–64°C to +191°C via configuration).
Technical Context
The TMP423AIDCNT implements dual-slope ADC architecture with programmable conversion rate (0.0625–8 conversions/sec) and supports diode-connected or transistor-connected remote sensors. It integrates series resistance cancellation and n-factor correction per remote channel to maintain ±1°C accuracy across PCB trace variations and semiconductor process mismatches.
Its SMBus interface complies with Intel SMBus v2.0 specifications, supporting Write Byte, Read Byte, Send Byte, and Receive Byte commands. The device uses a shared DXN terminal for all three remote channels (DXP1/DXP2/DXP3), enabling compact layout while retaining independent remote measurements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1°C max over –40°C to +125°C ambient; enables reliable thermal throttling without calibration. |
| Local Accuracy | ±1.5°C max over –40°C to +125°C; sufficient for die temperature tracking of host processors. |
| Resolution | 12-bit (1°C high byte + 0.0625°C low byte); delivers fine-grained thermal trend analysis. |
| 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; supports ultra-low-power thermal monitoring in always-on subsystems. |
| SMBus Clock | Up to 3.4 MHz; allows fast register reads during dynamic thermal events. |
| Series Resistance Cancellation | Up to 3 kΩ per remote channel; eliminates PCB trace resistance-induced offset without external compensation. |
Pinout & Package
SOT23-8 package (DCN designation), 2.9 mm × 1.6 mm × 1.0 mm body, surface-mount, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - DXP1 | Positive input for remote channel 1 | Connects to collector/emitter of PNP/NPN transistor or anode/cathode of diode for first remote junction. |
| 2 - DXP2 | Positive input for remote channel 2 | Independent positive terminal for second remote sensor; shares DXN (pin 4) as common negative reference. |
| 3 - DXP3 | Positive input for remote channel 3 | Enables third independent remote measurement point using same shared DXN return path. |
| 4 - DXN | Common negative input for all remote channels | Single return path for DXP1/DXP2/DXP3; reduces routing complexity and pin count vs discrete solutions. |
| 5 - GND | Analog/digital ground reference | Must be connected to low-impedance system ground plane to minimize noise coupling into remote sensing paths. |
| 6 - SDA | SMBus data line (open-drain) | Requires external pull-up resistor to V+; supports bidirectional communication and bus arbitration. |
| 7 - SCL | SMBus clock line (open-drain) | Master-generated clock; timing-critical for SMBus timeout compliance (25–35 ms). |
| 8 - V+ | Positive supply voltage | Supplies internal regulator, ADC, and interface logic; bypass capacitor (0.1 μF) required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Triple remote + local sensing | Measures temperature at four distinct points (1 die + 3 external junctions) in single SOT23-8 footprint - saves board space vs multiple single-channel sensors. |
| Programmable n-factor correction | Per-channel ideality factor (η = 1.008 default) adjustable via registers to match specific transistor/diode characteristics and improve accuracy. |
| Diode fault detection | Automatically flags open/short conditions on any remote channel and reports status in dedicated OPEN bit of low-byte registers. |
| Extended temperature range mode | Configurable via RANGE bit to support –64°C to +191°C (unsigned offset format), enabling cold-start and high-temp industrial use cases. |
| Multiple SMBus addresses | Two hardware address pins (A0, A1) allow up to four unique slave addresses (1001100x) on same bus - simplifies multi-sensor system design. |
Applications
| Processor Thermal Monitoring | FPGA Power Domain Sensing |
|---|---|
Use Scenario: Real-time junction temperature tracking of multi-core CPUs and GPUs under variable load in rack-mounted servers. IC Role / Device Role / Timing Role: Local sensor monitors SoC die temperature; three remote channels monitor VRM MOSFETs, memory modules, and heatsink baseplate. Use Value: Enables dynamic frequency scaling and fan control with ±1°C remote accuracy, reducing thermal derating margins by up to 3°C. | Use Scenario: Thermal profiling of configurable logic blocks, transceivers, and power delivery stages in high-end FPGAs deployed in telecom infrastructure. IC Role / Device Role / Timing Role: Remote channels track hotspots across FPGA banks; local channel validates on-die thermal sensor correlation. Use Value: Supports adaptive partial reconfiguration based on localized thermal stress, extending device lifetime in 24/7 operation. |
| Storage Area Network (SAN) Enclosure | LCD/DLP Projector Light Engine |
Use Scenario: Compact multi-drive chassis requiring individual HDD/SSD temperature supervision alongside controller ASIC thermal management. IC Role / Device Role / Timing Role: One remote channel per drive bay (DXP1–DXP3); local channel monitors RAID controller die temperature. Use Value: Prevents thermal-induced data corruption by triggering drive spin-down before exceeding 70°C - enabled by 3 kΩ series resistance cancellation across long flex cables. | Use Scenario: Thermal protection of high-brightness LED or laser light sources and associated driver ICs in portable projection systems. IC Role / Device Role / Timing Role: Remote channels monitor LED junction, driver MOSFET, and heat sink; local channel tracks projector SoC temperature. Use Value: Maintains color consistency and lumen output by limiting LED drive current when any remote channel exceeds 85°C - supported by 12-bit resolution and 100 ms conversion time. |
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 (DX1–DX4), identical SOT23-8 package and SMBus interface; no DXP3/DXN pin mapping. | Limited to two remote points; suitable when only CPU + VRM or FPGA + memory require monitoring. | Select TMP422AIDCNT if third remote channel is unnecessary - reduces BOM cost and firmware complexity. |
| LM95235CIMMX | Two remote + one local channel, SPI interface, 10-bit resolution, ±2°C remote accuracy, MSOP-8 package. | Requires SPI host support; lower resolution and accuracy limit use in precision thermal control loops. | Choose LM95235CIMMX only if existing system lacks SMBus infrastructure but requires dual remote sensing. |
Compared with TMP422AIDCNT and LM95235CIMMX, the TMP423AIDCNT uniquely delivers three independent remote measurements in the same SOT23-8 footprint with ±1°C accuracy and SMBus compatibility - making it optimal for dense, high-accuracy thermal architectures where pin count and bus standardization are critical.
Availability
TMP423AIDCNT is available at Aetrix Electronics and suitable for processor thermal monitoring, FPGA power domain sensing, storage area network enclosures, and LCD/DLP projector light engines requiring stable component supply and long-term industrial availability.
Supply support for TMP423AIDCNT 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 real-time signal chain technologies with over 50 years of innovation in precision sensing and power management.
The TMP423AIDCNT belongs to TI's precision temperature sensor product line, designed specifically for multi-point thermal management in high-performance computing, telecom, and industrial systems where accuracy, small size, and SMBus interoperability are essential.
FAQ
What is the maximum remote temperature measurement range supported by the TMP423AIDCNT?
The TMP423AIDCNT supports a default remote temperature range of –55°C to +150°C. When configured for extended range mode (RANGE bit = 1 in Configuration Register 1), it measures from –64°C to +191°C using unsigned extended binary format with 64°C offset. This mode is validated for use with standard diode-connected transistors and enables cold-start and high-temp industrial applications. The TMP423AIDCNT datasheet specifies ambient operating range as –40°C to +125°C.
How does the TMP423AIDCNT handle series resistance in remote sensor traces?
The TMP423AIDCNT implements automatic series resistance cancellation capable of compensating up to 3 kΩ of total series resistance per remote channel - caused by PCB traces, connectors, or bond wires. This is achieved through dual-current-source measurement and internal calculation, eliminating manual calibration or external compensation networks. The feature is active by default and verified across voltage (2.7 V–5.5 V) and temperature (–40°C to +125°C) ranges per the TMP423AIDCNT electrical characteristics table.
Can the TMP423AIDCNT measure three remote temperatures simultaneously?
No - the TMP423AIDCNT performs sequential conversions: one local and up to three remote channels are measured one after another in programmable order, with typical per-channel conversion time of 100–130 ms. Total cycle time for all four channels is ~400–520 ms at default rate. However, its register architecture allows reading all four temperature values from dedicated high/low byte registers (00h–03h, 10h–13h) without re-triggering conversions, enabling efficient polling. The TMP423AIDCNT does not support true simultaneous sampling.
What SMBus addresses are available for the TMP423AIDCNT?
With address pins A0 and A1 tied to V+ or GND, the TMP423AIDCNT supports four SMBus slave addresses: 10011000b (0x48), 10011001b (0x49), 10011010b (0x4A), and 10011011b (0x4B). These correspond to binary combinations A1:A0 = 00, 01, 10, 11. The default hardwired address is 10011000b (0x48) when both pins float or are pulled low per TI reference designs. All addresses comply with SMBus v2.0 and support standard read/write protocols without conflict.
Does the TMP423AIDCNT require external components for basic operation?
Yes - the TMP423AIDCNT requires three external components for reliable operation: (1) a 0.1 μF ceramic bypass capacitor between V+ and GND, placed within 5 mm of the device; (2) pull-up resistors on SDA and SCL lines (typically 4.7 kΩ to V+); and (3) remote sensor elements (diode-connected transistors or diodes) connected to DXP1/DXP2/DXP3 and DXN. No external RC filters or calibration components are needed due to integrated series resistance cancellation and n-factor correction in the TMP423AIDCNT.
TMP423AIDCNT 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
TMP423AIDCNT FAQ
1.How can I place an order for TMP423AIDCNT through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP423AIDCNT 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 TMP423AIDCNT reliable?
The price and inventory of TMP423AIDCNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP423AIDCNT is usually 5 days.
3.What payment methods are accepted for TMP423AIDCNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP423AIDCNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP423AIDCNT?
TMP423AIDCNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP423AIDCNT 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 TMP423AIDCNT?
For technical support, including TMP423AIDCNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP423AIDCNT requirements.
6.How does Aetrix verify that TMP423AIDCNT is sourced from the original manufacturer or authorized distributors?
All TMP423AIDCNT 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 TMP423AIDCNT meets industry standards.
7.What is the process for return or replacement of TMP423AIDCNT?
All TMP423AIDCNT units undergo pre-shipment inspection (PSI). If there is an issue with TMP423AIDCNT, 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 TMP423AIDCNT part is unused and in its original packaging.
Return procedure for TMP423AIDCNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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