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Texas Instruments TMP401AIDGKR
- Part No.:
- TMP401AIDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TMP401AIDGKR.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:14,093
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Product details
Overview
TMP401AIDGKR from Texas Instruments is a dual-channel digital temperature sensor IC featuring ±1°C remote diode sensing and ±3°C local die temperature measurement, programmable 9- to 12-bit resolution, SMBus-compatible two-wire interface, and dual open-drain thermal alert outputs (THERM and ALERT/THERM2), used for precision thermal monitoring in CPU/GPU power delivery and server board management.
For engineers reviewing the TMP401AIDGKR datasheet, TMP401AIDGKR pinout, TMP401AIDGKR application, or TMP401AIDGKR equivalent, key selection considerations include remote sensor ideality factor (1.008), series resistance cancellation capability up to 3 kΩ, diode fault detection, programmable over/undertemperature limits for both channels, and VSSOP-8 package compatibility with space-constrained embedded thermal control designs.
Technical Context
The TMP401AIDGKR integrates independent local and remote temperature measurement paths with dedicated comparators, register-mapped configuration (Configuration, Resolution, Conversion Rate, THERM Hysteresis), and SMBus protocol support including write byte, read byte, send byte, and receive byte commands. It supports extended temperature range operation (–55°C to +150°C) via RANGE bit in Configuration Register and stores high-byte temperature data in standard or extended binary format with 64-count offset.
Remote sensing uses programmable excitation currents (6 µA to 120 µA) across D+ and D– terminals to bias external PNP/NPN transistors or diodes, with built-in series resistance cancellation and diode fault detection logic. Local temperature is measured directly from the IC's silicon die, while remote channel resolution is fixed at 0.0625°C and local resolution is user-selectable (0.5°C to 0.0625°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1°C (–40°C to +100°C, V+ = 3.3 V); enables reliable CPU core thermal throttling without calibration |
| Local Accuracy | ±3°C (–40°C to +125°C); sufficient for ambient PCB temperature tracking near power stages |
| Resolution | Remote: fixed 0.0625°C; Local: programmable 9–12-bit (0.5°C to 0.0625°C); supports fine-grained fan control tuning |
| Supply Range | 3.0 V to 5.5 V; compatible with 3.3 V and 5 V system rails without level-shifting |
| Quiescent Current | 29–36 µA at 0.0625 conversions/sec; enables low-power thermal monitoring in always-on subsystems |
| SMBus Speed | Up to 2.5 MHz high-speed mode; allows rapid polling of multiple sensors on dense server backplanes |
| Alert Outputs | THERM (active-low, open-drain) and ALERT/THERM2 (reconfigurable); supports hardware-triggered shutdown or fan ramp-up |
Pinout & Package
VSSOP-8 (DGK) package, 3.00 mm × 3.00 mm body size, exposed pad not present, moisture sensitivity level (MSL) 2 per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V+ | Analog power input | Supplies internal analog and digital circuitry; requires 0.1 µF bypass capacitor to GND |
| 2 - D+ | Remote sensor anode | Positive terminal for external diode/transistor connection; biased with programmable current sources |
| 3 - D− | Remote sensor cathode | Negative terminal for remote junction; differential pair rejects common-mode noise up to 3 kΩ series resistance |
| 4 - THERM | Digital output | Active-low open-drain thermal flag; asserts when local or remote exceeds THERM limit; requires pull-up to V+ |
| 5 - GND | Ground reference | Analog and digital ground return; must be low-impedance path to minimize measurement error |
| 6 - ALERT/THERM2 | Digital output | Reconfigurable active-low open-drain alert; triggers on configurable over/undertemperature conditions; shares bus with other SMBus devices |
| 7 - SDA | SMBus bidirectional data | Open-drain serial data line; requires external pull-up; supports SMBus write/read/send/receive byte protocols |
| 8 - SCL | SMBus clock input | Open-drain serial clock line; requires external pull-up; operates up to 2.5 MHz in high-speed mode |
Key Features
| Feature | Design Value |
|---|---|
| Series resistance cancellation | Compensates for up to 3 kΩ trace resistance between D+ and D−, preserving ±1°C remote accuracy in real PCB layouts |
| Diode fault detection | Identifies open-circuit, short-circuit, or reverse-biased remote sensor conditions and flags in Status Register |
| Programmable THERM hysteresis | Configurable hysteresis prevents thermal oscillation during critical temperature transitions (e.g., CPU throttling boundaries) |
| Extended temperature range mode | Enables –55°C to +150°C measurement via RANGE bit; required for industrial GPU or FPGA junction monitoring |
| Consecutive alert threshold | Prevents false alarms by requiring N consecutive out-of-limit readings (N = 1–16) before asserting ALERT/THERM2 |
Applications
| Server CPU Thermal Management | Network Switch ASIC Monitoring |
|---|---|
|
Use Scenario: Real-time monitoring of multi-core CPU die temperature and VRM hotspots in 1U rack servers. IC Role / Device Role / Timing Role: TMP401AIDGKR provides local die temperature and remote transistor-sensed CPU core temperature via SMBus, feeding thermal data to BMC for dynamic fan speed control. Use Value: ±1°C remote accuracy ensures precise thermal throttling activation, preventing premature performance derating while avoiding thermal runaway. |
Use Scenario: Junction temperature supervision of high-density Ethernet switch ASICs operating at 85°C ambient. IC Role / Device Role / Timing Role: TMP401AIDGKR measures local PCB temperature and remote substrate diode of switch ASIC using 2N3906 PNP, reporting via SMBus to system controller. Use Value: Diode fault detection identifies failed thermal sensors before thermal protection failure, increasing system uptime in carrier-grade infrastructure. |
| Laptop GPU Power Stage Control | Industrial PLC Processor Module |
|
Use Scenario: Compact thermal feedback for discrete GPU voltage regulator modules in thin-and-light notebooks. IC Role / Device Role / Timing Role: TMP401AIDGKR's VSSOP-8 footprint monitors local VRM MOSFET temperature and remote GPU die via integrated thermal diode, triggering ALERT on overtemperature. Use Value: Programmable 9–12-bit local resolution enables fine-grained fan curve mapping, reducing acoustic noise without compromising thermal safety. |
Use Scenario: Harsh-environment temperature supervision for ARM-based PLC CPUs operating from –40°C to +85°C. IC Role / Device Role / Timing Role: TMP401AIDGKR delivers local ambient and remote processor junction data over SMBus, with THERM output hardwired to watchdog timer reset. Use Value: Undervoltage lockout (2.3–2.6 V) and wide operating range (–40°C to +125°C) ensure reliable operation during brownout or cold-start conditions. |
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 |
|---|---|---|---|
| TMP411AIDGKR | Improved remote accuracy (±0.75°C vs ±1°C), same VSSOP-8 package and pinout, identical register map and SMBus interface | Better suited for high-end workstation GPUs where sub-degree accuracy reduces thermal margin overhead | Select TMP411AIDGKR when tighter remote tolerance is required and cost premium is acceptable |
| LM95235CIMM/NOPB | Dual remote + local sensing, SPI interface only (no SMBus), 10-bit resolution, ±1.5°C remote accuracy, MSOP-8 package | Preferred in legacy SPI-based industrial controllers where SMBus is unavailable or bus loading is constrained | Choose LM95235CIMM/NOPB only if SPI interface is mandatory and SMBus compatibility is not required |
Compared with TMP401AIDGKR, TMP411AIDGKR offers higher remote accuracy with full pin and firmware compatibility, while LM95235CIMM/NOPB trades SMBus support for SPI-only communication and relaxed accuracy-making TMP401AIDGKR the optimal balance of interface flexibility, precision, and footprint for modern server and computing platforms.
Availability
TMP401AIDGKR is available at Aetrix Electronics and suitable for server motherboard thermal management, network equipment ASIC monitoring, and industrial PLC processor module designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TMP401AIDGKR 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 for industrial, automotive, and communications markets.
The TMP401AIDGKR belongs to TI's precision temperature sensor product line, designed specifically for dual-point thermal monitoring in high-reliability computing systems where SMBus integration, remote diode accuracy, and programmable alert thresholds are critical.
FAQ
What is the remote temperature accuracy specification for TMP401AIDGKR under typical operating conditions?
The TMP401AIDGKR achieves ±1°C remote temperature accuracy over –40°C to +100°C at V+ = 3.3 V, as specified in the Electrical Characteristics table. This accuracy holds across multiple IC manufacturers' transistors without calibration, enabled by its trimmed ideality factor of 1.008 and series resistance cancellation. The TMP401AIDGKR maintains this performance with 3 kΩ maximum series resistance on the D+/D− lines, making it suitable for real-world PCB routing constraints.
Does TMP401AIDGKR support both local and remote temperature measurement simultaneously?
Yes, TMP401AIDGKR continuously monitors both local die temperature and remote junction temperature in parallel. It stores results in separate registers (Local Temperature Register and Remote Temperature Register), each with high-byte (1°C resolution) and low-byte (fractional resolution) storage. Conversion rate is programmable from 0.0625 to 8 samples/sec, and one-shot mode allows synchronized sampling of both channels upon command.
How does the TMP401AIDGKR handle diode fault conditions in remote sensing?
The TMP401AIDGKR performs automatic diode fault detection during each remote temperature conversion and reports faults in the Status Register. It detects open-circuit (no current flow), short-circuit (excessive current), and reverse-bias conditions on the D+/D− inputs. When a fault occurs, the remote temperature reading defaults to 127°C and the corresponding status bit is set, allowing host firmware to log errors or initiate diagnostics without requiring external circuitry.
Can TMP401AIDGKR operate with a 5 V supply, and what is its quiescent current at that voltage?
Yes, TMP401AIDGKR operates across 3.0 V to 5.5 V, fully supporting 5 V nominal supplies. At V+ = 5.5 V and 0.0625 conversions/sec, its quiescent current is 29–36 µA, as specified in the Electrical Characteristics table. This ultra-low standby current enables continuous thermal monitoring in always-on subsystems such as server baseboard management controllers without impacting system power budgets.
What SMBus commands are supported by TMP401AIDGKR for configuration and readback?
The TMP401AIDGKR supports SMBus write byte, read byte, send byte, and receive byte commands. These enable full access to all 22 registers-including Configuration, Resolution, Conversion Rate, temperature limits, and status fields-without requiring complex packet protocols. The Pointer Register auto-increments during sequential reads, simplifying firmware implementation for temperature polling and alarm threshold updates in the TMP401AIDGKR.
TMP401AIDGKR 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:
- 3V ~ 5.5V
- Resolution:
- 11 b
- Features:
- One-Shot, Output Switch, Programmable Limit, Programmable Resolution, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±3°C
- Test Condition:
- -40°C ~ 125°C
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-VSSOP
TMP401AIDGKR FAQ
1.How can I place an order for TMP401AIDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP401AIDGKR 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 TMP401AIDGKR reliable?
The price and inventory of TMP401AIDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP401AIDGKR is usually 5 days.
3.What payment methods are accepted for TMP401AIDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP401AIDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP401AIDGKR?
TMP401AIDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP401AIDGKR 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 TMP401AIDGKR?
For technical support, including TMP401AIDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP401AIDGKR requirements.
6.How does Aetrix verify that TMP401AIDGKR is sourced from the original manufacturer or authorized distributors?
All TMP401AIDGKR 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 TMP401AIDGKR meets industry standards.
7.What is the process for return or replacement of TMP401AIDGKR?
All TMP401AIDGKR units undergo pre-shipment inspection (PSI). If there is an issue with TMP401AIDGKR, 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 TMP401AIDGKR part is unused and in its original packaging.
Return procedure for TMP401AIDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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