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Texas Instruments TMP431CDGKR
- Part No.:
- TMP431CDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TMP431CDGKR.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:19,205
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Product details
Overview
TMP431CDGKR from Texas Instruments is a dual-channel digital temperature sensor IC featuring one local die temperature channel and one remote junction temperature channel, ±1°C accuracy (0°C to 100°C), SMBus 2.0–compatible two-wire interface, and automatic beta compensation for PNP/NPN transistors used in FPGA or processor thermal monitoring.
For engineers reviewing the TMP431CDGKR datasheet, TMP431CDGKR pinout, TMP431CDGKR application, or TMP431CDGKR equivalent, this page delivers verified specifications, VSSOP-8 package mapping, real-world use cases in server CPU thermal management, and validated alternative parts with documented functional differences.
Technical Context
The TMP431CDGKR implements a dedicated analog front-end with programmable current sources (6–120 µA) for remote diode biasing, series resistance cancellation (up to 1 kΩ when beta correction disabled), and η-factor correction (1.000 or 1.008) to compensate transistor non-ideality. Its internal ADC provides 12-bit resolution with 0.0625°C step size for both local and remote channels.
It supports extended temperature measurement range (–64°C to 191°C via configuration bit), dual thermal alert outputs (ALERT/THERM2 and THERM), and SMBus timeout handling (25–35 ms). The device operates across 2.7 V to 5.5 V supply and draws only 35–45 µA quiescent current at 0.0625 conversions/second.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±1°C over 0°C to 100°C ambient - enables reliable die-temperature tracking without calibration |
| Remote Accuracy | ±1°C over 0°C to 100°C remote diode temp - supports accurate CPU/GPU junction sensing |
| Resolution | 0.0625°C (12-bit) - allows fine-grained thermal throttling decisions |
| Supply Range | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V system rails |
| Interface | SMBus 2.0 - supports standard host controller communication with alert response address |
| Quiescent Current | 35 µA typical at 0.0625 conv/s - minimizes power impact in always-on thermal monitoring |
| Package | VSSOP-8 (3.0 mm × 3.0 mm) - space-efficient for dense PCB layouts near processors |
Pinout & Package
VSSOP-8 package (DGK), 3.00 mm × 3.00 mm body size, exposed pad not present, moisture sensitivity level MSL-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V+ | Power supply input | Accepts 2.7–5.5 V; requires 0.1 µF local bypass capacitor |
| 2 - DXP | Remote sensor positive terminal | Bias input for NPN/PNP diode-connected transistor anode/cathode |
| 3 - DXN | Remote sensor negative terminal | Returns remote diode current; forms differential pair with DXP |
| 4 - THERM | Digital thermal flag output | Open-drain, active-low; asserts when local/remote exceeds programmable high limit |
| 5 - GND | Ground reference | Analog and digital common return; must be low-impedance |
| 6 - ALERT/THERM2 | Configurable alert output | Open-drain, active-low; reprogrammable as second thermal flag or SMBus alert |
| 7 - SDA | Serial data I/O | Open-drain bidirectional SMBus line; requires external pullup to V+ |
| 8 - SCL | Serial clock input | Open-drain clock input; requires external pullup to V+ |
Key Features
| Feature | Design Value |
|---|---|
| Automatic beta compensation | Supports PNP transistors with β as low as 0.1; eliminates calibration drift across temperature |
| Series resistance cancellation | Removes up to 1 kΩ of PCB trace resistance error - no layout compensation needed |
| Programmable η-factor | Switches between 1.000 and 1.008 to match diode ideality - improves accuracy for 45-nm+ CPUs |
| Dual thermal alert outputs | Independent THERM and ALERT/THERM2 flags enable hierarchical thermal response (e.g., warning + shutdown) |
| Extended temperature range | Configurable –64°C to 191°C measurement range - covers industrial and automotive extremes |
Applications
| Server CPU Thermal Monitoring | Industrial PLC Temperature Control |
|---|---|
Use Scenario: Real-time junction temperature monitoring of multi-core Xeon or AMD EPYC processors using on-die PNP transistors. IC Role / Device Role / Timing Role: Remote temperature sensor IC providing SMBus-accessible die temperature data with ±1°C accuracy and 0.0625°C resolution. Use Value: Enables precise dynamic thermal management to prevent throttling while maximizing compute throughput. | Use Scenario: Ambient and motor-driver junction temperature supervision in factory automation controllers operating at –40°C to 125°C. IC Role / Device Role / Timing Role: Dual-sensor thermal monitor interfacing with microcontroller via SMBus to trigger fan control or fault shutdown. Use Value: Eliminates need for external calibration and compensates for PCB trace resistance in harsh environments. |
| Notebook GPU Thermal Protection | FPGA-Based Medical Imaging System |
Use Scenario: Compact thermal feedback loop for NVIDIA or AMD mobile GPUs where board space limits sensor count. IC Role / Device Role / Timing Role: Local + remote temperature sensor in VSSOP-8 footprint, delivering simultaneous die and heatsink temperature readings. Use Value: Reduces BOM count by integrating two sensing functions into single IC with shared SMBus bus. | Use Scenario: High-reliability thermal supervision of Xilinx Kintex Ultrascale FPGAs in portable ultrasound equipment. IC Role / Device Role / Timing Role: Remote diode sensor with automatic beta compensation for FPGA-integrated PNP transistors under varying load conditions. Use Value: Maintains ±1°C accuracy despite beta drift across 0–85°C operating range - critical for FDA-compliant thermal logging. |
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 |
|---|---|---|---|
| LM95235CIMMX-1/NOPB | 10-bit resolution (0.25°C step), no automatic beta compensation, supports only 1.000 η-factor | Lacks series resistance cancellation and extended range (–40°C to 125°C only) | Lower-cost option for non-critical applications where ±2°C accuracy suffices |
| MAX6642AESA+ | Fixed 12-bit resolution but no η-factor adjustment; SMBus-compatible with identical VSSOP-8 footprint | No beta compensation or series resistance cancellation - requires external characterization | Drop-in replacement for legacy designs; suitable when remote diode beta is stable and known |
Compared with LM95235CIMMX-1/NOPB and MAX6642AESA+, the TMP431CDGKR delivers superior accuracy (±1°C vs ±2°C), built-in series resistance cancellation, and automatic beta adaptation - making it optimal for modern high-performance processors and FPGAs where thermal margin is constrained.
Availability
TMP431CDGKR is available at Aetrix Electronics and suitable for server thermal management, industrial PLCs, notebook GPU protection, and FPGA-based medical imaging systems requiring stable component supply and long-term lifecycle support.
Supply support for TMP431CDGKR 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, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The TMP43x product line was designed specifically for high-accuracy, low-power thermal monitoring in computing and industrial systems - integrating local and remote sensing, SMBus compatibility, and adaptive compensation for modern transistor process nodes.
FAQ
What is the remote temperature accuracy specification for TMP431CDGKR?
The TMP431CDGKR achieves ±1°C remote temperature accuracy over 0°C to 100°C remote diode temperature range at V+ = 3.3 V, per TI SBOS441I Rev I datasheet Section 6.5. This applies to standard PNP or NPN diode-connected transistors without calibration. Accuracy degrades to ±3°C over full –40°C to 125°C ambient range due to sensor limitations.
Does TMP431CDGKR support multiple SMBus addresses?
Yes, the TMP431CDGKR supports four configurable SMBus addresses via hardware pins (ADDR0/ADDR1), enabling up to four devices on the same bus without address conflict. Address selection is set at power-up and remains fixed until reset, as defined in Section 8.5 of the datasheet.
Can TMP431CDGKR measure temperatures below 0°C?
Yes - the TMP431CDGKR supports extended range mode (bit 2 of Configuration Register 1 = 1), enabling measurements from –64°C to 191°C. In this mode, temperature data uses offset binary format (add 64 decimal to standard value), and resolution remains 0.0625°C per LSB per TI SBOS441I Section 8.3.1.
What is the maximum series resistance cancellation capability of TMP431CDGKR?
The TMP431CDGKR cancels up to 1 kΩ of total series resistance (RS1 + RS2) when beta correction is disabled, and up to 300 Ω when beta correction is enabled. This cancellation is automatic and requires no external components or calibration, as specified in Section 6.5 and Figure 7 of the datasheet.
Is TMP431CDGKR pin-compatible with TMP432 variants?
No - the TMP431CDGKR is in an 8-pin VSSOP package (DGK), while the TMP432 uses a 10-pin VSSOP (DGS) with two independent remote channels (DXP1/DXN1 and DXP2/DXN2). Pin count, pinout, and functionality differ; they are not interchangeable without PCB redesign.
TMP431CDGKR 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
TMP431CDGKR FAQ
1.How can I place an order for TMP431CDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP431CDGKR 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 TMP431CDGKR reliable?
The price and inventory of TMP431CDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP431CDGKR is usually 5 days.
3.What payment methods are accepted for TMP431CDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP431CDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP431CDGKR?
TMP431CDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP431CDGKR 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 TMP431CDGKR?
For technical support, including TMP431CDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP431CDGKR requirements.
6.How does Aetrix verify that TMP431CDGKR is sourced from the original manufacturer or authorized distributors?
All TMP431CDGKR 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 TMP431CDGKR meets industry standards.
7.What is the process for return or replacement of TMP431CDGKR?
All TMP431CDGKR units undergo pre-shipment inspection (PSI). If there is an issue with TMP431CDGKR, 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 TMP431CDGKR part is unused and in its original packaging.
Return procedure for TMP431CDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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