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Texas Instruments TMP431ADGKT
- Part No.:
- TMP431ADGKT
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TMP431ADGKT.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:970
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Product details
Overview
TMP431ADGKT from Texas Instruments is a dual-channel digital temperature sensor IC featuring one local die temperature channel and one remote junction temperature channel, with ±1°C accuracy (0°C to 100°C), SMBus™/I²C-compatible two-wire interface, and automatic beta compensation for PNP/NPN transistors used in FPGA or processor thermal monitoring.
For engineers reviewing the TMP431ADGKT datasheet, TMP431ADGKT pinout, TMP431ADGKT application, or TMP431ADGKT equivalent, key selection considerations include its VSSOP-8 package, 12-bit resolution (0.0625°C step), programmable ALERT/THERM2 output configuration, diode fault detection, and support for series resistance cancellation up to 1 kΩ when beta correction is disabled.
Technical Context
The TMP431ADGKT implements a dedicated analog front-end with dual current sources for remote diode sensing, coupled with an on-die ADC and SMBus controller. Its beta compensation logic dynamically selects optimal collector current ranges (0.1–27 β) per conversion cycle to maintain accuracy across transistor process variations.
It supports extended temperature measurement range (–64°C to 191°C) via register-configurable extended binary format, while maintaining 1°C integer resolution in high byte and 0.0625°C fractional resolution in low byte - both stored across two registers per channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±1°C over 0°C to 100°C ambient; enables reliable die-temperature triggering without calibration. |
| Remote Accuracy | ±1°C over 0°C to 100°C ambient and –40°C to 150°C remote diode; validated across multiple NPN/PNP transistors. |
| Resolution | 0.0625°C (12-bit); provides fine-grained thermal margining for high-performance processors and FPGAs. |
| Supply Range | 2.7 V to 5.5 V; compatible with 3.3 V and 5 V system rails without level-shifting. |
| Quiescent Current | 35–45 μA at 0.0625 conversions/sec; enables ultra-low-power thermal monitoring in always-on subsystems. |
| SMBus Speed | Up to 3.4 MHz; supports fast polling in dense multi-sensor server or telecom backplane environments. |
| Series Resistance Cancellation | Up to 1 kΩ (beta disabled); eliminates PCB trace-induced offset without hardware compensation networks. |
Pinout & Package
VSSOP-8 package (3.00 mm × 3.00 mm, 0.65 mm pitch), thermally enhanced for PCB-mounted thermal sensing applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V+ | Power supply input | Accepts 2.7–5.5 V; internal regulator powers analog/digital blocks; requires 0.1-μF bypass capacitor. |
| 2 - DXP | Remote sensor positive terminal | Drives current into base-collector junction of external PNP/NPN transistor; forms sensing loop with DXN. |
| 3 - DXN | Remote sensor negative terminal | Returns remote sensing current; differential pair with DXP rejects common-mode noise on long traces. |
| 4 - THERM | Dedicated thermal flag output | Open-drain, active-low; asserts when local/remote exceeds programmable THERM limit; wired-OR capable. |
| 5 - GND | Analog/digital ground reference | Single ground pin; must be connected to low-impedance system ground plane for accurate remote sensing. |
| 6 - ALERT/THERM2 | Reconfigurable alert output | Open-drain, active-low; default SMBus alert function; can be remapped as second thermal flag via register. |
| 7 - SDA | Bidirectional SMBus data line | Open-drain I/O; requires external pullup to V+; supports read/write byte, send/receive byte commands. |
| 8 - SCL | SMBus clock input | Open-drain input; requires external pullup to V+; defines timing for all serial transactions. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic beta compensation | Adapts collector current drive per conversion to match β = 0.1–27 transistors, eliminating manual β tuning. |
| η-factor correction | Supports ideality factor 1.000 or 1.008; corrects for non-ideal diode behavior in integrated processor junctions. |
| Programmable threshold limits | Independent high/low limits for local and remote channels; enables dual-zone thermal management policies. |
| Diode fault detection | Identifies open-circuit, short-circuit, or reversed diode connections; prevents false temperature readings. |
| ALERT/THERM2 pin reconfiguration | Single pin serves either SMBus alert or secondary thermal flag; reduces board routing complexity. |
Applications
| Processor Thermal Monitoring | FPGA Junction Sensing |
|---|---|
Use Scenario: Real-time die temperature tracking of x86 CPUs or ARM SoCs during dynamic workload scaling. IC Role / Device Role / Timing Role: Local sensor measures package die temperature; remote channel monitors external transistor embedded in CPU package. Use Value: Enables OS-level thermal throttling and DVFS control with ±1°C accuracy, avoiding unnecessary frequency reduction. | Use Scenario: Monitoring hotspots in large-scale FPGA fabric during compute-intensive acceleration tasks. IC Role / Device Role / Timing Role: Remote channel reads junction temperature of on-die PNP transistor; local channel tracks ambient PCB temperature. Use Value: Supports adaptive partial reconfiguration based on localized thermal stress, extending device lifetime. |
| Server Blade Management | Industrial Controller Thermal Safety |
Use Scenario: Multi-point thermal supervision across CPU, memory, and VRM zones in 1U rack servers. IC Role / Device Role / Timing Role: SMBus-connected node providing local + remote readings to BMC; ALERT triggers fan ramp-up or shutdown. Use Value: Reduces thermal-related field failures by detecting early-stage overheating before catastrophic failure. | Use Scenario: Overtemperature lockout in PLCs operating in uncooled enclosures at 70°C ambient. IC Role / Device Role / Timing Role: THERM output directly drives safety relay; local sensor validates enclosure air temperature. Use Value: Meets IEC 61508 functional safety requirements for thermal cut-off without external comparators. |
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 |
|---|---|---|---|
| TMP451RTER | VQFN-16 package; adds second remote channel and EEPROM for calibration storage; higher quiescent current (65 μA). | Required for triple-sensor systems (e.g., CPU + GPU + VRM); not drop-in due to pin count and footprint change. | Select when needing nonvolatile limit storage or third remote channel; not suitable for space-constrained VSSOP layouts. |
| LM95235EMMX/NOPB | MSOP-10; ±1.5°C remote accuracy; no automatic beta compensation; fixed η = 1.008 only. | Lacks auto-ranging for low-β transistors; requires manual β setting; lower accuracy at extremes. | Choose for cost-sensitive industrial designs where ±1.5°C tolerance is acceptable and transistor β is stable. |
Compared with TMP431ADGKT, TMP451RTER offers expanded channel count and nonvolatile configuration but requires PCB redesign, while LM95235EMMX/NOPB trades accuracy and adaptive compensation for lower unit cost and simpler register mapping.
Availability
TMP431ADGKT is available at Aetrix Electronics and suitable for server thermal management, FPGA monitoring, and industrial controller safety systems requiring stable component supply and long-term lifecycle support.
Supply support for TMP431ADGKT 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The TMP43x product line was designed specifically for high-accuracy, low-power thermal monitoring in computing and infrastructure equipment, addressing the need for calibrated remote diode sensing without factory trimming.
FAQ
What is the maximum remote temperature measurement range supported by the TMP431ADGKT?
The TMP431ADGKT supports an extended remote temperature measurement range of –64°C to 191°C when configured via Configuration Register 1 bit 2. However, practical operation is limited to –40°C to 150°C for most remote diodes, and the local sensor is rated only from –40°C to 125°C. The TMP431ADGKT achieves this using extended binary encoding with a 64-count offset in the high byte register.
Does the TMP431ADGKT require external calibration for remote diode sensing?
No, the TMP431ADGKT does not require external calibration. It delivers ±1°C remote accuracy across multiple transistor manufacturers without trimming, enabled by automatic beta compensation, η-factor correction, and series resistance cancellation. These features are implemented in hardware and operate per conversion cycle, making the TMP431ADGKT suitable for production deployment without per-unit calibration.
How does the ALERT/THERM2 pin function on the TMP431ADGKT?
The ALERT/THERM2 pin on the TMP431ADGKT is a multifunction, open-drain output that defaults to SMBus alert signaling but can be reconfigured via register to act as a second thermal flag. When asserted, it pulls low to indicate violation of user-programmed temperature thresholds. It requires an external pullup resistor to V+ and supports wired-OR connection with other devices on the same bus, enabling centralized thermal event handling in complex systems using the TMP431ADGKT.
What is the power supply rejection performance of the TMP431ADGKT?
The TMP431ADGKT exhibits ±0.2°C to ±0.5°C/V temperature error versus supply voltage variation across its 2.7 V to 5.5 V operating range. This specification ensures stable thermal readings despite rail droop or ripple in noisy power environments - critical for reliable operation in servers and industrial controllers where the TMP431ADGKT monitors sensitive thermal margins under dynamic load conditions.
Can the TMP431ADGKT interface with standard I²C controllers, or is SMBus required?
The TMP431ADGKT is fully compatible with standard I²C controllers operating in Standard Mode (100 kHz) and Fast Mode (400 kHz), in addition to SMBus-compliant hosts. It supports core I²C protocols including write byte, read byte, send byte, and receive byte commands. While it implements SMBus alert response addressing, this feature is optional - the TMP431ADGKT functions correctly with any I²C master without SMBus-specific firmware extensions.
TMP431ADGKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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:
- 12 b
- Features:
- One-Shot, Output Switch, Programmable Limit, Programmable Resolution, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±1°C (±2.5°C)
- Test Condition:
- 0°C ~ 100°C (-40°C ~ 125°C)
- Operating Temperature:
- -55°C ~ 127°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-VSSOP
TMP431ADGKT FAQ
1.How can I place an order for TMP431ADGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP431ADGKT 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 TMP431ADGKT reliable?
The price and inventory of TMP431ADGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP431ADGKT is usually 5 days.
3.What payment methods are accepted for TMP431ADGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP431ADGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP431ADGKT?
TMP431ADGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP431ADGKT 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 TMP431ADGKT?
For technical support, including TMP431ADGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP431ADGKT requirements.
6.How does Aetrix verify that TMP431ADGKT is sourced from the original manufacturer or authorized distributors?
All TMP431ADGKT 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 TMP431ADGKT meets industry standards.
7.What is the process for return or replacement of TMP431ADGKT?
All TMP431ADGKT units undergo pre-shipment inspection (PSI). If there is an issue with TMP431ADGKT, 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 TMP431ADGKT part is unused and in its original packaging.
Return procedure for TMP431ADGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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