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Texas Instruments TMP431BDGKT
- Part No.:
- TMP431BDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TMP431BDGKT.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
TMP431BDGKT 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 for both channels over –40°C to 125°C ambient, 0.0625°C resolution, SMBus 2.0 interface, and automatic beta/series-resistance compensation - used for real-time thermal monitoring in CPU/FPGA power domains.
For engineers reviewing the TMP431BDGKT datasheet, TMP431BDGKT pinout, TMP431BDGKT application, or TMP431BDGKT equivalent, key selection criteria include its VSSOP-8 package, single-remote-diode support, ALERT/THERM2 reconfigurable flag pin, diode fault detection, and compatibility with low-beta (≥0.1) PNP transistors in high-density compute systems.
Technical Context
The TMP431BDGKT implements a dedicated analog front-end with programmable current sources (6–120 μA) for remote diode biasing, auto-ranging beta compensation across 0.1–27 range, and series resistance cancellation up to 1 kΩ (beta disabled) or 300 Ω (beta enabled). Its internal oscillator drives 12-bit ADC conversions with configurable conversion rates from 0.0625 to 8 conversions/sec.
It uses SMBus 2.0 protocol with 3.4 MHz max clock frequency, supports multiple slave addresses, and features two independent thermal alert outputs (ALERT and THERM) with open-drain configuration requiring external pullups - enabling wired-OR integration into system-level thermal management logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±1°C over 0°C–100°C at 3.3 V - enables reliable die-temperature triggering without calibration |
| Remote Accuracy | ±1°C over –40°C–100°C remote diode range - ensures precise junction monitoring of CPUs/FPGAs |
| Resolution | 0.0625°C (12-bit + fractional byte) - supports fine-grained thermal throttling decisions |
| Supply Range | 2.7 V–5.5 V - compatible with 3.3 V and 5 V system rails without level-shifting |
| Interface | SMBus 2.0 (I²C-compatible), 3.4 MHz max - integrates into existing server/industrial bus infrastructure |
| Quiescent Current | 35–45 μA at 0.0625 conv/sec - suitable for always-on thermal supervision in low-power states |
| Package | VSSOP-8 (3.0 mm × 3.0 mm) - enables compact placement near heat sources on dense PCBs |
Pinout & Package
VSSOP-8 package (DGK), 3.00 mm × 3.00 mm body size, exposed pad not present, RoHS-compliant, moisture sensitivity level 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V+) | Power supply input | Accepts 2.7–5.5 V; powers internal regulator, ADC, and SMBus I/O; requires 0.1-μF bypass capacitor |
| 2 (DXP) | Remote diode positive terminal | Analog input for PNP/NPN transistor anode/cathode; biased with programmable current source |
| 3 (DXN) | Remote diode negative terminal | Analog return path; completes remote sensing loop; enables differential measurement |
| 4 (THERM) | Digital thermal flag output | Open-drain active-low output; asserts when local/remote exceeds programmable THERM limit |
| 5 (ALERT/THERM2) | Reconfigurable alert output | Open-drain active-low; defaults as ALERT; can be software-configured as second thermal flag |
| 6 (GND) | Ground reference | Analog and digital common return; must be low-impedance connection to system ground plane |
| 7 (SCL) | SMBus clock input | Open-drain input; requires external pullup to V+; supports 3.4 MHz high-speed mode |
| 8 (SDA) | SMBus bidirectional data | Open-drain I/O; shares bus with other SMBus devices; supports read/write/send/receive commands |
Key Features
| Feature | Design Value |
|---|---|
| Automatic beta compensation | Adapts collector-current biasing to external transistor beta (0.1–27), eliminating drift-induced error in sub-90nm processors |
| Series resistance cancellation | Compensates up to 1 kΩPCB trace resistance without calibration, preserving accuracy in long-sensor layouts |
| η-factor correction | Supports ideality factor tuning (1.000 or 1.008) to match diode-connected or GND-collector PNP transistors |
| Programmable thresholds | Independent high/low limits for local and remote channels stored in nonvolatile registers - enables autonomous alarm triggering |
| Diode fault detection | Identifies open-circuit, short-circuit, or reverse-biased conditions on DXP/DXN and flags via status register |
Applications
| Processor Thermal Monitoring | FPGA Junction Sensing |
|---|---|
Use Scenario: Real-time die temperature tracking of multi-core x86 CPUs during turbo boost and AVX workloads. IC Role / Device Role / Timing Role: Local sensor measures SoC die temperature; remote channel monitors external transistor embedded in CPU package. Use Value: Enables dynamic frequency scaling and thermal throttling with ±1°C accuracy, preventing thermal runaway without host intervention. | Use Scenario: Monitoring junction temperature of high-performance FPGA fabric under variable logic utilization and transceiver activity. IC Role / Device Role / Timing Role: Remote diode interface reads temperature from FPGA-integrated PNP transistor; local sensor tracks ambient board temperature. Use Value: Supports adaptive voltage/frequency scaling (AVFS) by delivering 0.0625°C-resolution data to FPGA configuration logic via SMBus. |
| Industrial Controller Thermal Safety | Server DIMM Slot Monitoring |
Use Scenario: Overtemperature protection in PLCs and motion controllers operating in uncooled enclosures from –40°C to 70°C ambient. IC Role / Device Role / Timing Role: TMP431BDGKT acts as standalone thermal supervisor - triggers hardware shutdown via THERM pin when local or remote exceeds 85°C. Use Value: Eliminates need for microcontroller-based polling; provides fail-safe response within 15 ms of threshold breach. | Use Scenario: Per-module temperature monitoring in DDR4/DDR5 memory subsystems where each DIMM requires independent thermal profiling. IC Role / Device Role / Timing Role: Mounted directly on DIMM PCB; remote diode senses DRAM junction; local sensor tracks module ambient. Use Value: Enables JEDEC-compliant thermal throttling (TT) and memory refresh rate adjustment using SMBus-accessible min/max registers. |
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, no local sensor, ±1.5°C remote accuracy, 1.7 V–3.6 V supply | Lacks local temperature sensing; optimized for multi-die monitoring rather than combined die+ambient use cases | Select when monitoring ≥2 remote diodes is required and local sensing is handled elsewhere |
| MAX6642AESA+ | SOIC-8, single remote + local, ±2°C accuracy, 3.0 V–5.5 V, no beta compensation, fixed 1.000 η-factor | No automatic beta or series-resistance cancellation - requires manual characterization for low-beta transistors | Choose for cost-sensitive industrial applications where ±2°C tolerance and legacy diode types suffice |
Compared with LM95235CIMMX/NOPB and MAX6642AESA+, the TMP431BDGKT uniquely delivers ±1°C local+remote accuracy with automatic beta/series-resistance compensation in a space-constrained VSSOP-8, making it optimal for CPU/FPGA thermal management where precision and minimal layout overhead are critical.
Availability
TMP431BDGKT is available at Aetrix Electronics and suitable for server thermal management, industrial controller safety systems, and FPGA-based embedded computing requiring stable component supply and long-term lifecycle assurance.
Supply support for TMP431BDGKT 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 with broad industrial, automotive, and communications reach.
The TMP43x product line was designed specifically for high-accuracy, low-power thermal monitoring in space-constrained computing platforms - targeting CPU, GPU, FPGA, and ASIC junction temperature control with minimal host intervention.
FAQ
What is the maximum remote temperature measurement range supported by the TMP431BDGKT?
The TMP431BDGKT supports an extended remote temperature measurement range of –55°C to 150°C when configured for extended binary mode (bit 2 of Configuration Register 1 = 1). Its internal accuracy specification remains ±1°C over 0°C–100°C, and the device's ambient operating range is –40°C to 125°C. The TMP431BDGKT does not guarantee accuracy beyond 150°C for remote diodes due to physical limitations of standard silicon transistors.
Does the TMP431BDGKT require external calibration for different transistor beta values?
No, the TMP431BDGKT performs automatic beta compensation at the start of every temperature conversion, adapting to external transistor beta values from 0.1 to 27 without user calibration. This feature eliminates manual characterization and maintains ±1°C remote accuracy across process variations and temperature gradients - a core capability confirmed in the SBOS441I datasheet revision October 2019.
Can the ALERT and THERM pins of the TMP431BDGKT be used simultaneously as independent thermal flags?
Yes, the TMP431BDGKT supports dual thermal flag operation: THERM is fixed as a primary thermal alert, while ALERT/THERM2 can be software-reconfigured via Configuration Register 1 to function as either a second independent thermal flag (THERM2) or a general-purpose SMBus alert. Both outputs are open-drain and support wired-OR sharing with other devices on the same bus.
What is the SMBus timing compliance of the TMP431BDGKT?
The TMP431BDGKT complies with SMBus 2.0 specifications, supporting standard mode (100 kHz), fast mode (400 kHz), and high-speed mode (3.4 MHz). It includes built-in timeout protection (25–35 ms), meets VIH/VIL thresholds (2.1 V/0.8 V), and specifies SCL/SDA input capacitance at ≤3 pF - ensuring interoperability with TI's TPSxxxx PMICs and industry-standard SMBus masters.
How does the TMP431BDGKT handle series resistance in the remote diode path?
The TMP431BDGKT cancels series resistance automatically: up to 1 kΩwhen beta compensation is disabled, and up to 300 Ωwhen enabled. This cancellation occurs in real time during each conversion cycle using dual-current-source measurement, removing offset errors caused by PCB trace resistance or connector impedance - a capability explicitly verified in Section 8.3.3 of the SBOS441I datasheet.
TMP431BDGKT 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
TMP431BDGKT FAQ
1.How can I place an order for TMP431BDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP431BDGKT 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 TMP431BDGKT reliable?
The price and inventory of TMP431BDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP431BDGKT is usually 5 days.
3.What payment methods are accepted for TMP431BDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP431BDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP431BDGKT?
TMP431BDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP431BDGKT 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 TMP431BDGKT?
For technical support, including TMP431BDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP431BDGKT requirements.
6.How does Aetrix verify that TMP431BDGKT is sourced from the original manufacturer or authorized distributors?
All TMP431BDGKT 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 TMP431BDGKT meets industry standards.
7.What is the process for return or replacement of TMP431BDGKT?
All TMP431BDGKT units undergo pre-shipment inspection (PSI). If there is an issue with TMP431BDGKT, 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 TMP431BDGKT part is unused and in its original packaging.
Return procedure for TMP431BDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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