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Texas Instruments TMP431BDGKR
- Part No.:
- TMP431BDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TMP431BDGKR.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,779
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Product details
Overview
TMP431BDGKR 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–100°C), SMBus 2.0/3.0 interface, 12-bit resolution (0.0625°C step), and automatic beta compensation for PNP/NPN transistors. It operates from 2.7 V to 5.5 V and targets FPGA, processor, and industrial controller thermal monitoring.
For engineers reviewing the TMP431BDGKR datasheet, TMP431BDGKR pinout, TMP431BDGKR application, or TMP431BDGKR equivalent, key selection considerations include its VSSOP-8 package, single-remote-diode architecture, ALERT/THERM2 reconfigurable flag, series resistance cancellation (up to 1 kΩ), and support for extended temperature range (–64°C to 191°C) via register configuration.
Technical Context
The TMP431BDGKR implements a dedicated analog front-end with programmable current sources (6–120 μA) for remote diode biasing, integrated ADC with 12-bit resolution, and on-chip oscillator for conversion timing. Its beta compensation logic dynamically selects correction ranges (0.1–27) per conversion cycle based on external transistor characteristics.
It uses SMBus-compatible two-wire communication with 3.4 MHz max clock frequency, supports multiple slave addresses, and features dual thermal alert outputs (ALERT and THERM) with open-drain configuration requiring external pullups. The device includes minimum/maximum temperature tracking registers and diode fault detection logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±1°C over 0°C–100°C - enables precise die-temperature monitoring without calibration in CPU/FPGA thermal management. |
| Remote Accuracy | ±1°C over 0°C–100°C, TDIODE = –40°C–150°C - ensures reliable junction sensing across semiconductor process nodes. |
| Resolution | 0.0625°C (12-bit) - provides fine-grained thermal trending for fan control and throttling algorithms. |
| Supply Range | 2.7 V–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 - supports low-power thermal monitoring in always-on subsystems. |
| SMBus Speed | Up to 3.4 MHz - allows fast register reads during high-frequency thermal polling in server applications. |
| Package | VSSOP-8 (3.0 mm × 3.0 mm) - enables compact placement near hot components with minimal PCB footprint. |
Pinout & Package
VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, 0.65 mm lead pitch, exposed thermal pad (not electrically connected), RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V+ | Power supply input | Accepts 2.7–5.5 V; requires 0.1 μF bypass capacitor close to pin for stable ADC and SMBus operation. |
| 2 - DXP | Remote diode positive terminal | Bias current source output; connects to collector/base of PNP or emitter of NPN remote transistor. |
| 3 - DXN | Remote diode negative terminal | Differential input for remote junction voltage measurement; rejects common-mode noise on PCB traces. |
| 4 - ALERT/THERM2 | Configurable open-drain output | Programmable as second thermal alert (THERM2) or general-purpose interrupt; requires external pullup to V+. |
| 5 - GND | Analog/digital ground reference | Single ground connection; must be routed with low-impedance path to minimize measurement offset. |
| 6 - SCL | SMBus clock input | Open-drain input; requires external pullup; supports standard/fast/high-speed modes up to 3.4 MHz. |
| 7 - SDA | SMBus bidirectional data | Open-drain I/O; shares bus with other SMBus devices; supports write byte, read byte, send byte commands. |
| 8 - THERM | Dedicated thermal flag output | Active-low open-drain output triggered when temperature exceeds programmable THERM limit; independent of ALERT. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic beta compensation | Dynamically adjusts for transistor beta variation (0.1–27) per conversion, eliminating manual calibration for 90-nm and smaller process nodes. |
| Series resistance cancellation | Compensates up to 1 kΩof PCB trace resistance when beta correction is disabled, removing fixed thermal offset without hardware changes. |
| η-factor correction | Supports ideality factor tuning (1.000 or 1.008) to match diode-connected or GND-collector PNP transistors, improving remote accuracy by >0.5°C. |
| Programmable threshold limits | Independent high/low limits for local and remote channels stored in nonvolatile registers, enabling autonomous overtemperature shutdown. |
| Diode fault detection | Identifies open-circuit, short-circuit, and reverse-biased conditions on DXP/DXN, preventing false thermal alarms in field deployments. |
Applications
| Processor Thermal Monitoring | FPGA Temperature Management |
|---|---|
Use Scenario: Real-time junction temperature tracking of multi-core CPUs during dynamic load changes in servers and workstations. IC Role / Device Role / Timing Role: Remote diode sensor interfacing with on-die PNP transistor; provides 12-bit temperature data every 15–137 ms depending on beta mode. Use Value: Enables accurate thermal throttling and fan speed control using ±1°C remote accuracy without factory calibration. |
Use Scenario: Monitoring die temperature of high-density FPGAs in telecom baseband units and industrial PLCs. IC Role / Device Role / Timing Role: Local + remote dual-channel sensor feeding thermal management firmware; supports extended range (–64°C to 191°C) for cold-start validation. Use Value: Prevents thermal runaway during reconfiguration bursts using programmable THERM flag with sub-100 ms response latency. |
| Industrial Controller Thermal Protection | Storage Area Network (SAN) Enclosure Monitoring |
Use Scenario: Ambient and component-level temperature supervision in DIN-rail mounted PLCs operating from –40°C to 125°C. IC Role / Device Role / Timing Role: Local sensor measures ambient PCB temperature; remote channel monitors power MOSFET junction via external diode. Use Value: Delivers ±1°C local accuracy and series resistance cancellation to maintain reliability across wide industrial temperature extremes. |
Use Scenario: Multi-point thermal monitoring inside 2U/4U SAN chassis housing dozens of hot-pluggable drives and controllers. IC Role / Device Role / Timing Role: SMBus-addressable node in daisy-chained thermal network; ALERT output wired-OR'd with other sensors for centralized fault reporting. Use Value: Reduces BOM count via single-device dual-channel capability and eliminates need for external level shifters with 3.3 V/5 V tolerant interface. |
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/NOPB | VSSOP-10; dual remote channels only (no local sensor); ±1.5°C remote accuracy; no beta compensation. | Lacks local die sensing; requires external local sensor for full thermal visibility; lower accuracy limits use in precision CPU monitoring. | Select when dual remote diodes are needed and local sensing is handled separately; not suitable as drop-in replacement for TMP431BDGKR. |
| MAX6642AESA+ | SOIC-8; single remote + local; ±2°C remote accuracy; I²C-only (no SMBus Alert response); no series resistance cancellation. | Higher thermal error margin; lacks SMBus ALERT protocol compliance and diode fault detection; limited to basic thermal flagging. | Choose for cost-sensitive industrial applications where ±2°C accuracy suffices and SMBus Alert functionality is unused. |
Compared with LM95235CIMMX/NOPB and MAX6642AESA+, the TMP431BDGKR uniquely integrates local + single-remote sensing with ±1°C accuracy, automatic beta compensation, and SMBus Alert compliance in a space-saving VSSOP-8 package-making it optimal for processor/FPGA thermal management where calibration-free precision and protocol robustness are required.
Availability
TMP431BDGKR is available at Aetrix Electronics and suitable for server thermal management, industrial controller protection, and FPGA temperature monitoring requiring stable component supply and long-term lifecycle support.
Supply support for TMP431BDGKR 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, calibration-free thermal monitoring in computing, telecom, and industrial systems-addressing challenges of beta drift, series resistance, and multi-node SMBus thermal networks.
FAQ
What is the maximum remote temperature measurement range supported by the TMP431BDGKR?
The TMP431BDGKR supports an extended remote temperature measurement range of –64°C to 191°C when configured via bit 2 of Configuration Register 1. However, practical accuracy of ±1°C is guaranteed only from –40°C to 150°C for the remote diode sensor, as validated across multiple transistor manufacturers. The local sensor remains specified from –40°C to 125°C.
Does the TMP431BDGKR require external calibration for remote temperature measurements?
No, the TMP431BDGKR does not require external calibration. Its automatic beta compensation, η-factor correction, and series resistance cancellation enable ±1°C remote accuracy across diverse PNP/NPN transistors and PCB layouts without user calibration. This is confirmed in TI's SBOS441I datasheet Section 3 and Table 6.5.
Can the ALERT and THERM pins of the TMP431BDGKR be used simultaneously for different thermal thresholds?
Yes, the TMP431BDGKR supports independent configuration of ALERT and THERM outputs. ALERT is triggered by user-programmed high/low limits for local or remote channels, while THERM responds to a separate set of programmable thresholds. Both are open-drain and can be wired-OR'd with other devices on the same SMBus line.
What SMBus protocols does the TMP431BDGKR support, and is it compatible with standard I²C hosts?
The TMP431BDGKR supports SMBus 2.0 and 3.0 protocols including Write Byte, Read Byte, Send Byte, and Receive Byte commands. It is electrically compatible with standard I²C hosts operating at ≤400 kHz, but full SMBus Alert response functionality (e.g., Alert Response Address) requires an SMBus-aware controller.
How does the TMP431BDGKR handle series resistance in the remote diode connection?
The TMP431BDGKR cancels up to 1 kΩof total series resistance (RS1 + RS2) on the DXP/DXN lines when beta correction is disabled, and up to 300 Ωwhen enabled. This cancellation occurs automatically during each conversion cycle and eliminates thermal offset caused by PCB trace resistance-no external compensation components are needed.
TMP431BDGKR 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
TMP431BDGKR FAQ
1.How can I place an order for TMP431BDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP431BDGKR 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 TMP431BDGKR reliable?
The price and inventory of TMP431BDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP431BDGKR is usually 5 days.
3.What payment methods are accepted for TMP431BDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP431BDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP431BDGKR?
TMP431BDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP431BDGKR 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 TMP431BDGKR?
For technical support, including TMP431BDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP431BDGKR requirements.
6.How does Aetrix verify that TMP431BDGKR is sourced from the original manufacturer or authorized distributors?
All TMP431BDGKR 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 TMP431BDGKR meets industry standards.
7.What is the process for return or replacement of TMP431BDGKR?
All TMP431BDGKR units undergo pre-shipment inspection (PSI). If there is an issue with TMP431BDGKR, 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 TMP431BDGKR part is unused and in its original packaging.
Return procedure for TMP431BDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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