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Texas Instruments TMP431DDGKT
- Part No.:
- TMP431DDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TMP431DDGKT.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:502
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Product details
Overview
TMP431DDGKT from Texas Instruments is a dual-channel (1 local + 1 remote) ±1°C precision digital temperature sensor IC with SMBus™/I²C interface, automatic beta compensation, series resistance cancellation, and programmable thermal alert outputs (ALERT/THERM2 and THERM). It operates from 2.7 V to 5.5 V and supports remote diode sensing for microprocessor, FPGA, or SoC junction temperature monitoring in high-reliability computing systems.
For engineers reviewing the TMP431DDGKT datasheet, TMP431DDGKT pinout, TMP431DDGKT application, or TMP431DDGKT equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in TI's SBOS441I production data sheet (Rev. I, October 2019).
Technical Context
The TMP431DDGKT implements a dedicated analog front-end for remote diode sensing using dual current sources (6–120 μA selectable) and adaptive η-factor correction (1.000 or 1.008), enabling accurate measurement across PNP/NPN transistors and integrated diodes. Its on-die local sensor achieves ±1°C accuracy over –40°C to 125°C ambient.
It features two open-drain digital outputs - ALERT/THERM2 (reconfigurable) and THERM - each with 6 mA sink capability and pullup requirement, supporting wired-OR thermal flagging. Conversion timing is configurable: remote channel completes in 33–137 ms depending on beta correction and RC setting, while local conversion takes 12–17 ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±1°C over 0°C to 100°C at 3.3 V - enables direct die-temperature validation without calibration. |
| Remote Accuracy | ±1°C over –40°C to 100°C remote diode range - supports reliable CPU/FPGA junction monitoring. |
| Supply Range | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V system rails without level-shifting. |
| Interface | SMBus 2.0 / I²C-compatible, up to 3.4 MHz - integrates into existing bus infrastructure with standard protocol support. |
| Resolution | 0.0625°C (12-bit) for both local and remote channels - provides fine-grained thermal trending for fan control or throttling. |
| Quiescent Current | 35–45 μA at 0.0625 conversions/s - minimizes power impact in always-on thermal monitoring applications. |
| Package | VSSOP-8 (DGK), 3.0 mm × 3.0 mm - compact footprint suitable for space-constrained server DIMMs and embedded controllers. |
Pinout & Package
VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, 0.65 mm pitch, exposed thermal pad not present. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V+ | Power supply input | Accepts 2.7 V–5.5 V; requires 0.1 μF local bypass capacitor for stable ADC operation. |
| 2 - DXP | Remote sensor positive input | Connects to collector/base of PNP or emitter of NPN remote diode; bias current sourced here. |
| 3 - DXN | Remote sensor negative input | Completes remote diode sensing path; differential pair rejects common-mode noise on PCB traces. |
| 4 - THERM | Dedicated thermal flag output | Open-drain, active-low; asserts when local or remote temp exceeds programmable THERM limit - used for hardware shutdown. |
| 5 - GND | Analog/digital ground reference | Single ground pin; must be connected to low-impedance system ground plane to minimize measurement error. |
| 6 - ALERT/THERM2 | Reconfigurable alert output | Open-drain, active-low; defaults as ALERT; can be software-configured as second thermal flag (THERM2) via register. |
| 7 - SDA | Serial data I/O | Open-drain bidirectional SMBus line; requires external pullup to V+; supports read/write byte and receive/send byte commands. |
| 8 - SCL | Serial clock input | Open-drain clock input; requires external pullup to V+; supports standard/fast/high-speed modes up to 3.4 MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic beta compensation | Adaptively selects optimal current source and correction range (β = 0.1 to 27) per conversion - eliminates manual transistor characterization. |
| Series resistance cancellation | Compensates up to 1 kΩseries resistance (beta disabled) or 300 Ω(beta enabled) - removes PCB trace-induced offset without hardware mods. |
| Programmable η-factor | Supports 1.000 or 1.008 ideality factor selection - matches physical behavior of discrete diodes or integrated PNP transistors. |
| Dual thermal flags | Independent ALERT and THERM outputs with separate threshold registers - enables tiered response (e.g., warning → throttle → shutdown). |
| Extended temperature range | Configurable –64°C to 191°C data format (offset binary) - supports legacy or wide-range diodes beyond standard –55°C to 150°C. |
Applications
| Processor Thermal Monitoring | FPGA Junction Sensing |
|---|---|
|
Use Scenario: Real-time die temperature tracking of x86 CPUs or ARM SoCs during load transitions in servers and workstations. IC Role / Device Role / Timing Role: Remote diode sensor interfacing directly to on-die PNP transistor; local sensor monitors package ambient. Use Value: Enables dynamic thermal management (DTM) with ±1°C accuracy - critical for maintaining performance within TDP limits. |
Use Scenario: Monitoring junction temperature of high-density FPGAs in telecom baseband units and AI accelerators. IC Role / Device Role / Timing Role: Measures remote diode voltage drop across FPGA-integrated PNP; local channel tracks board-level ambient drift. Use Value: Prevents thermal runaway during reconfiguration bursts by triggering throttling before 105°C junction threshold. |
| Industrial Controller Safety | Storage Area Network (SAN) Enclosure |
|
Use Scenario: Overtemperature protection in PLCs and motor drives operating in harsh environments (–40°C to 125°C). IC Role / Device Role / Timing Role: Local sensor validates internal controller die temperature; remote channel monitors heatsink-mounted transistor. Use Value: Dual independent alerts (THERM + ALERT) allow fail-safe shutdown and predictive maintenance logging. |
Use Scenario: Per-drive thermal supervision in multi-bay NAS and SAN enclosures with hot-swap capability. IC Role / Device Role / Timing Role: Mounted on backplane near SATA/SAS connectors; remote diode senses drive controller IC temperature. Use Value: Detects early-stage thermal faults before SSD/HDD failure - reduces uncorrectable bit error rates (UBER) in RAID arrays. |
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, 1 local + 2 remote channels, ±0.75°C accuracy, 1.7 V–3.6 V supply - higher precision but narrower voltage range. | Requires redesign for dual-remote sensing; lower supply enables battery-powered edge nodes. | Select TMP451RTER only if dual remote channels and sub-1°C accuracy are mandatory and 3.3 V rail is guaranteed. |
| LM95235EIMM/NOPB | MSOP-8, 1 local + 1 remote, ±1.5°C accuracy, SPI-only interface, no beta compensation - simpler but less accurate. | Lacks SMBus compatibility and automatic series resistance cancellation - demands manual calibration for PCB trace effects. | Choose LM95235EIMM/NOPB only for cost-sensitive industrial designs where SMBus is unused and ±1.5°C tolerance is acceptable. |
Compared with TMP431DDGKT, TMP451RTER adds a second remote channel and tighter accuracy but sacrifices supply flexibility and increases footprint; LM95235EIMM/NOPB offers SPI simplicity but lacks key error-correction features required for high-reliability computing thermal management.
Availability
TMP431DDGKT is available at Aetrix Electronics and suitable for server thermal management, FPGA monitoring, industrial controller safety, and storage enclosure applications requiring stable component supply and long-term lifecycle support.
Supply support for TMP431DDGKT 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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of leadership in precision sensing and power management ICs.
The TMP43x product line was designed specifically for high-accuracy, multi-point thermal monitoring in computing and communications infrastructure - emphasizing robustness against PCB parasitics, process variation, and wide ambient ranges.
FAQ
What is the maximum remote temperature measurement range supported by the TMP431DDGKT?
The TMP431DDGKT supports an extended remote temperature range of –64°C to 191°C when configured via Configuration Register 1, though practical diode sensing is limited to –55°C to 150°C. The device's specified accuracy of ±1°C applies over –40°C to 100°C for remote measurements at 3.3 V supply. This range is achieved through offset-binary encoding and is fully documented in TI's SBOS441I datasheet Section 8.3.1.
Does the TMP431DDGKT require external components for basic operation?
Yes - the TMP431DDGKT requires three external components for reliable operation: a 0.1 μF ceramic bypass capacitor between V+ and GND, and pullup resistors on SCL, SDA, ALERT/THERM2, and THERM pins (typically 4.7 kΩto V+). No external passive components are needed for remote diode sensing, as series resistance cancellation and beta compensation are handled internally. These requirements are specified in Section 8.1 and Figure 11 of the TMP431DDGKT datasheet.
Can the ALERT and THERM outputs of the TMP431DDGKT drive a microcontroller GPIO directly?
Yes - both ALERT and THERM are open-drain outputs rated for 6 mA sink current at ≤0.4 V, making them compatible with standard 3.3 V or 5 V microcontroller GPIOs when pulled up to the same rail. They do not require level-shifting or buffering. However, the microcontroller must configure the GPIO as input with internal pullup disabled (since external pullups are mandatory), and firmware must handle the active-low assertion logic. This interface method is confirmed in the Pin Functions table (Section 5) and Functional Block Diagram (Section 8.2) of the TMP431DDGKT datasheet.
How does the TMP431DDGKT handle series resistance in remote sensing traces?
The TMP431DDGKT cancels up to 1 kΩof total series resistance (RS1 + RS2) when beta compensation is disabled, and up to 300 Ωwhen enabled - eliminating temperature offset caused by PCB trace resistance without requiring layout changes or calibration. This is implemented via dual-current-source measurement and is detailed in Section 8.3.3 and Electrical Characteristics Table 6.5. The feature is automatic and requires no register configuration beyond enabling/disabling beta correction.
Is the TMP431DDGKT pin-compatible with the TMP432?
No - the TMP431DDGKT (VSSOP-8) and TMP432 (VSSOP-10) have different pin counts and incompatible pinouts. The TMP431 uses pins 2/3 for DXP/DXN (single remote channel), while the TMP432 dedicates pins 2/3 and 4/5 to DXP1/DXN1 and DXP2/DXN2 (dual remote channels). Shared signals (V+, GND, SCL, SDA, ALERT/THERM2, THERM) occupy different positions. Migration requires PCB layout revision; no drop-in replacement exists. This is explicitly shown in Figures 1 and 2 and the Pin Functions table of the TMP431DDGKT datasheet.
TMP431DDGKT 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
TMP431DDGKT FAQ
1.How can I place an order for TMP431DDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP431DDGKT 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 TMP431DDGKT reliable?
The price and inventory of TMP431DDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP431DDGKT is usually 5 days.
3.What payment methods are accepted for TMP431DDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP431DDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP431DDGKT?
TMP431DDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP431DDGKT 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 TMP431DDGKT?
For technical support, including TMP431DDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP431DDGKT requirements.
6.How does Aetrix verify that TMP431DDGKT is sourced from the original manufacturer or authorized distributors?
All TMP431DDGKT 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 TMP431DDGKT meets industry standards.
7.What is the process for return or replacement of TMP431DDGKT?
All TMP431DDGKT units undergo pre-shipment inspection (PSI). If there is an issue with TMP431DDGKT, 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 TMP431DDGKT part is unused and in its original packaging.
Return procedure for TMP431DDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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