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Texas Instruments TMP431ADGKR
- Part No.:
- TMP431ADGKR
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TMP431ADGKR.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,680
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Product details
Overview
TMP431ADGKR from Texas Instruments is a dual-channel digital temperature sensor IC with one local and one remote diode-connected transistor sensing channel, ±1°C remote accuracy (0°C–100°C), SMBus 2-wire interface, and programmable ALERT/THERM2 output configuration - used for precision thermal monitoring in FPGA and processor subsystems.
For engineers reviewing the TMP431ADGKR datasheet, TMP431ADGKR pinout, TMP431ADGKR application, or TMP431ADGKR equivalent, key selection criteria include remote diode measurement resolution (0.0625°C), series resistance cancellation (up to 1 kΩ), automatic beta compensation range (0.1–27), η-factor correction (1.000/1.008), and VSSOP-8 package compatibility with space-constrained embedded thermal management designs.
Technical Context
The TMP431ADGKR implements a dedicated analog front-end with dual current sources for remote diode biasing, integrated 12-bit ADCs for local and remote channels, and SMBus-compliant serial interface logic supporting write byte, read byte, send byte, and receive byte commands. It features auto-ranging beta compensation that dynamically selects optimal collector current based on external transistor characteristics.
Its functional architecture includes independent register banks for configuration, temperature data, high/low limit thresholds, and status flags - enabling simultaneous local die temperature tracking and remote junction monitoring with programmable alert behavior via open-drain ALERT and THERM outputs requiring external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±1.25°C max error (–40°C to 125°C); enables reliable on-die thermal guardbanding for SoC/FPGA junction protection |
| Remote Accuracy | ±0.25°C typ / ±1°C max (0°C–100°C, TDIODE = –40°C–150°C); supports high-fidelity CPU/GPU diode sensing without calibration |
| Resolution | 0.0625°C per LSB (12-bit + fractional byte); provides fine-grained thermal trend analysis for dynamic throttling decisions |
| 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 conv/s; enables always-on thermal supervision in low-power industrial controllers |
| SMBus Speed | Up to 3.4 MHz; supports fast polling in high-throughput server thermal management loops |
| Series R Cancellation | Up to 1 kΩ (beta disabled) or 300 Ω (beta enabled); eliminates PCB trace resistance-induced offset in long-sensor layouts |
Pinout & Package
VSSOP-8 (DGK) package, 3.00 mm × 3.00 mm body size, 0.65 mm lead pitch, exposed thermal pad optional - optimized for compact placement near heat sources and minimal board area consumption.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Power supply input | Accepts 2.7–5.5 V; powers internal regulator, ADC, and SMBus interface - requires 0.1 μF local bypass capacitor |
| GND | Ground reference | Analog/digital common return; must be low-impedance connection to minimize noise coupling into remote sensing path |
| SCL | SMBus clock input | Open-drain, requires external pullup to V+; defines timing for all serial transactions including alarm threshold writes |
| SDA | SMBus bidirectional data | Open-drain, shared bus line; supports multi-drop configurations with other SMBus devices on same net |
| DXP | Remote sensor positive | Analog input for PNP/NPN transistor anode/cathode; biased with programmable current sources for diode voltage measurement |
| DXN | Remote sensor negative | Analog input for transistor emitter/base; differential pair with DXP enables rejection of common-mode noise on remote lines |
| THERM | Dedicated thermal flag output | Open-drain, active-low; asserts when local or remote temperature exceeds user-defined THERM limit - used for hardware shutdown triggers |
| ALERT/THERM2 | Reconfigurable alert output | Open-drain, active-low; defaults as second thermal flag (THERM2), configurable via register to function as general-purpose ALERT |
Key Features
| Feature | Design Value |
|---|---|
| Automatic beta compensation | Supports PNP transistors with β as low as 0.1; eliminates manual β tuning and maintains ±1°C accuracy across process/voltage/temperature variation |
| η-factor correction | Programmable ideality factor (1.000 or 1.008); corrects for non-ideal diode behavior in discrete or integrated remote sensors |
| Diode fault detection | Identifies open-circuit, short-circuit, or reverse-biased remote diodes; prevents false thermal alarms and enables robust system diagnostics |
| Programmable resolution mode | Configurable conversion rate (0.0625–8 conversions/s); balances measurement latency vs. power consumption for real-time thermal control |
| Extended temperature range | –64°C to 191°C measurement capability (via register bit); supports legacy diodes rated to –55°C and high-temp industrial sensors up to 150°C |
Applications
| Processor Thermal Monitoring | FPGA Junction Sensing |
|---|---|
Use Scenario: Real-time die temperature tracking of x86 CPUs or ARM-based SoCs using integrated PNP transistor diodes. IC Role / Device Role / Timing Role: Remote channel measures junction voltage drop across CPU-embedded diode; local channel monitors sensor die temperature for self-heating compensation. Use Value: Enables dynamic frequency scaling and thermal throttling with ±1°C remote accuracy - critical for maintaining performance within JEDEC thermal limits. | Use Scenario: Monitoring core and I/O bank temperatures in Xilinx or Intel FPGAs with multiple on-die diode sensors. IC Role / Device Role / Timing Role: Dual-channel operation allows concurrent measurement of two independent remote diodes (e.g., core + I/O), while local sensor validates ambient reference. Use Value: Supports per-region thermal management policies with 0.0625°C resolution - improves reliability during partial reconfiguration and high-speed transceiver operation. |
| Industrial Controller Thermal Guarding | Server DIMM Slot Monitoring |
Use Scenario: Continuous thermal surveillance in PLCs and motor drives where ambient temperature swings exceed 85°C. IC Role / Device Role / Timing Role: Local sensor tracks PCB temperature rise; remote channel interfaces with external 2N3906 PNP transistor mounted on heatsink or power stage. Use Value: Automatic beta compensation ensures stable readings across –40°C to 125°C operating range - avoids recalibration during seasonal environmental shifts. | Use Scenario: Per-module temperature monitoring in DDR4/DDR5 memory subsystems with discrete diode sensors on DIMMs. IC Role / Device Role / Timing Role: SMBus address flexibility (multiple configurable addresses) allows daisy-chaining up to 8 TMP431ADGKR units on single bus for dense memory thermal mapping. Use Value: Programmable ALERT/THERM2 outputs drive hardware throttling signals directly to memory controller - reduces latency versus software-based polling. |
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 |
|---|---|---|---|
| TMP451RTET | Higher remote accuracy (±0.75°C), integrated EEPROM for calibration storage, same VSSOP-8 footprint | Targeted at systems requiring factory-trimmed offsets and long-term drift compensation | Select TMP451RTET when absolute accuracy stability over 10-year life is required; TMP431ADGKR preferred for cost-sensitive, high-volume industrial use |
| LM95235EIMM/NOPB | Two remote channels + local, SPI interface only, MSOP-10 package, no beta compensation | Used where SPI bus availability simplifies host interface and dual remote sensing is mandatory | Choose LM95235EIMM/NOPB if existing design uses SPI and needs two independent remote inputs; TMP431ADGKR fits SMBus-only or space-constrained VSSOP-8 layouts |
Compared with TMP451RTET and LM95235EIMM/NOPB, the TMP431ADGKR delivers optimal balance of SMBus compatibility, automatic beta compensation, and VSSOP-8 footprint - making it ideal for FPGA/CPU thermal monitoring where remote diode accuracy and layout simplicity are prioritized over EEPROM-based calibration or SPI interface support.
Availability
TMP431ADGKR is available at Aetrix Electronics and suitable for server thermal management, industrial controller safety monitoring, and FPGA-based embedded systems requiring stable component supply and guaranteed long-term manufacturability.
Supply support for TMP431ADGKR 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 precision sensing, power management, and interface solutions.
The TMP43x product line was designed specifically for high-accuracy, low-power thermal monitoring in computing, communications, and industrial equipment - emphasizing SMBus integration, automatic sensor compensation, and robust diode fault handling.
FAQ
What is the remote temperature accuracy specification for TMP431ADGKR under typical operating conditions?
The TMP431ADGKR achieves ±0.25°C typical and ±1°C maximum remote temperature accuracy over 0°C to 100°C ambient and –40°C to 150°C remote diode temperature, measured at V+ = 3.3 V. This specification holds without calibration and applies to standard NPN/PNP transistors or diodes used as remote sensors - a key advantage confirmed in TI's SBOS441I datasheet Section 6.5.
Does TMP431ADGKR support automatic compensation for series resistance in the remote sensor path?
Yes, TMP431ADGKR supports series resistance cancellation of up to 1 kΩ when beta compensation is disabled, and up to 300 Ω when enabled. This feature actively removes measurement offset caused by PCB trace resistance or connector impedance - verified in Electrical Characteristics Table 6.5 and detailed in Section 8.3.3 of the TMP431ADGKR datasheet.
Can TMP431ADGKR measure temperatures below 0°C, and what is its extended range capability?
Yes, TMP431ADGKR supports extended-range operation from –64°C to 191°C by setting bit 2 of Configuration Register 1. While the device is rated for ambient operation from –40°C to 125°C, its internal measurement engine accommodates this full extended range - with practical remote diode limits typically –55°C to 150°C as noted in Section 8.3.1 of the TMP431ADGKR datasheet.
How does the ALERT/THERM2 pin function on TMP431ADGKR, and can it be reconfigured?
The ALERT/THERM2 pin on TMP431ADGKR is a dual-function, open-drain output that defaults to THERM2 (second thermal flag) but can be reconfigured via Configuration Register 1 to operate as a general-purpose ALERT signal. Both modes are active-low and require an external pullup resistor - functionality confirmed in Pin Functions Table 5 and Section 8.4 of the official TMP431ADGKR datasheet.
What SMBus communication speeds does TMP431ADGKR support, and are timing parameters guaranteed?
TMP431ADGKR supports SMBus Fast Mode (up to 400 kHz) and High-Speed Mode (up to 3.4 MHz), with fully specified timing parameters including t(HDSTA), t(SUDAT), t(LOW), and t(HIGH) provided in Section 6.6 of the datasheet. These values are production-tested and guaranteed across –40°C to 125°C ambient temperature and 2.7 V to 5.5 V supply voltage.
TMP431ADGKR 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:
- 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:
- 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
TMP431ADGKR FAQ
1.How can I place an order for TMP431ADGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP431ADGKR 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 TMP431ADGKR reliable?
The price and inventory of TMP431ADGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP431ADGKR is usually 5 days.
3.What payment methods are accepted for TMP431ADGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP431ADGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP431ADGKR?
TMP431ADGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP431ADGKR 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 TMP431ADGKR?
For technical support, including TMP431ADGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP431ADGKR requirements.
6.How does Aetrix verify that TMP431ADGKR is sourced from the original manufacturer or authorized distributors?
All TMP431ADGKR 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 TMP431ADGKR meets industry standards.
7.What is the process for return or replacement of TMP431ADGKR?
All TMP431ADGKR units undergo pre-shipment inspection (PSI). If there is an issue with TMP431ADGKR, 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 TMP431ADGKR part is unused and in its original packaging.
Return procedure for TMP431ADGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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