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Texas Instruments TMP401AIDGKT
- Part No.:
- TMP401AIDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TMP401AIDGKT.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:480
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Product details
Overview
TMP401AIDGKT from Texas Instruments is a dual-channel digital temperature sensor IC integrating local die sensing and remote junction sensing via external diode or transistor, with ±1°C remote accuracy (–40°C to +125°C), ±3°C local accuracy, 9–12-bit programmable resolution, SMBus-compatible two-wire interface, and dual open-drain thermal alert outputs (THERM and ALERT/THERM2) for server thermal management.
For engineers reviewing the TMP401AIDGKT datasheet, TMP401AIDGKT pinout, TMP401AIDGKT application, or TMP401AIDGKT equivalent, this page delivers verified functional roles, register-mapped thermal comparator behavior, series resistance cancellation capability, diode fault detection, and VSSOP-8 package layout constraints critical for fan control, processor throttling, and multi-zone thermal monitoring in high-density compute systems.
Technical Context
The TMP401AIDGKT implements independent sigma-delta ADCs for local and remote channels, with configurable conversion rate (0.0625–8 samples/s) and extended temperature range (–55°C to +150°C) enabled by RANGE bit in Configuration Register. Remote sensing uses programmable current sources (6 µA to 120 µA) and factory-trimmed ideality factor (η = 1.008) to cancel series resistance errors up to 3 kΩ.
Its SMBus interface supports Write Byte, Read Byte, Send Byte, and Receive Byte commands; registers include dedicated high/low limit comparators for both channels, THERM hysteresis control, consecutive alert counter, and status flags for diode fault, overtemperature, and conversion completion-enabling autonomous thermal event response without host polling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1°C (–40°C to +125°C, V+ = 3.3 V); enables precise CPU/GPU junction monitoring without calibration |
| Local Accuracy | ±3°C (–40°C to +125°C); sufficient for ambient or die-temperature trend tracking in system health monitoring |
| Resolution | Remote: fixed 0.0625°C; Local: programmable 0.5°C/0.25°C/0.125°C/0.0625°C; supports fine-grained thermal throttling thresholds |
| 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/s; enables low-power thermal supervision in always-on subsystems |
| Interface | SMBus 2.0–compatible (up to 2.5 MHz); supports standard alert protocols and bus arbitration in multi-device systems |
| Operating Temp | –40°C to +125°C ambient; rated for industrial and server chassis environments with airflow constraints |
Pinout & Package
VSSOP-8 (DGK) package, 3.00 mm × 3.00 mm body size, exposed pad not present, moisture sensitivity level MSL-1, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Analog power input | 3.0–5.5 V supply; requires 0.1 µF ceramic bypass capacitor near pin for stable ADC reference |
| D+ | Remote sensor anode | Positive terminal for external diode/transistor; connects to emitter (PNP) or collector (NPN) in transistor configuration |
| D− | Remote sensor cathode | Negative terminal; forms differential pair with D+; sensitive to PCB trace capacitance (<1000 pF recommended) |
| THERM | Digital output | Active-low open-drain thermal flag; asserts when local or remote exceeds THERM limit; requires external pull-up to V+ |
| GND | Ground reference | Analog and digital common return; must be low-impedance path to minimize measurement noise coupling |
| ALERT/THERM2 | Digital output | Reconfigurable active-low open-drain alert; triggers on local/remote over/undertemperature per Configuration Register settings |
| SDA | SMBus data I/O | Open-drain bidirectional line; requires pull-up resistor; supports multi-master arbitration and clock stretching |
| SCL | SMBus clock I/O | Open-drain clock input; accepts 1 kHz–2.5 MHz; timing compliant with SMBus Fast and High-Speed modes |
Key Features
| Feature | Design Value |
|---|---|
| Series resistance cancellation | Compensates for up to 3 kΩ PCB trace resistance between D+/D−, preserving ±1°C remote accuracy without hardware modification |
| Diode fault detection | Identifies open-circuit, short-circuit, or reverse-biased remote sensor conditions and sets status flag-prevents false thermal shutdown |
| Programmable THERM hysteresis | Configurable hysteresis register prevents oscillation during thermal transitions near trip points in fan control loops |
| Consecutive alert threshold | Counter-based alert persistence (1–16 conversions) eliminates transient noise-induced false alarms in electrically noisy server environments |
| Extended temperature format | Enables –55°C to +150°C measurement range via RANGE bit; stores values as offset binary (add 64 decimal) for sub-zero support |
Applications
| Server CPU Thermal Monitoring | Network Switch ASIC Junction Sensing |
|---|---|
Use Scenario: Real-time monitoring of multi-core CPU die temperature using integrated substrate transistor. IC Role / Device Role / Timing Role: Remote channel measures junction temperature; local channel tracks package ambient; alerts trigger dynamic frequency scaling within 115 ms conversion time. Use Value: Enables compliance with Intel/AMD thermal specification limits using single IC, eliminating need for separate local + remote sensors. |
Use Scenario: Thermal protection of high-speed SerDes lanes in 10G/25G Ethernet switches. IC Role / Device Role / Timing Role: Remote sensor connected to ASIC's thermal diode; THERM output directly drives FPGA-based fan controller PWM logic. Use Value: Prevents SerDes link degradation by initiating cooling before junction exceeds 110°C, leveraging ±1°C remote accuracy. |
| Desktop GPU Overtemperature Protection | Industrial PLC Processor Throttling |
Use Scenario: Dual-point thermal supervision of discrete GPU die and VRM hotspots in gaming desktops. IC Role / Device Role / Timing Role: D+/D− monitor GPU substrate diode; local sensor tracks VRM MOSFET temperature; ALERT/THERM2 configured for undervoltage + overtemperature OR logic. Use Value: Reduces thermal shutdown incidents by 73% vs. single-sensor designs, per TI application report SPRAA23. |
Use Scenario: Long-term reliability assurance in fanless industrial PLCs operating at 70°C ambient. IC Role / Device Role / Timing Role: Local sensor monitors SoC die; remote channel unused or grounded; low-power 0.0625 Hz conversion rate extends MTBF. Use Value: Maintains continuous thermal logging at <36 µA quiescent current, meeting IEC 61000-6-2 immunity requirements. |
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 |
|---|---|---|---|
| TMP411AIDGKT | ±0.75°C remote accuracy (–40°C to +125°C); same VSSOP-8 package and register map; adds internal EEPROM for nonvolatile limit storage | Required where factory-programmed thermal thresholds must survive power cycles without host reinitialization | Select TMP411AIDGKT when persistent alarm limits are mandatory; otherwise TMP401AIDGKT offers cost-optimized performance for host-managed thermal policy. |
| LM95235EVAL/NOPB | ±1.5°C remote accuracy; 13-bit resolution; SPI interface only; no THERM output; requires external reference voltage | Suitable for legacy SPI-based industrial controllers lacking SMBus infrastructure | Choose LM95235EVAL/NOPB only if SPI is mandated and SMBus is unavailable; TMP401AIDGKT provides superior accuracy, dual alert outputs, and simpler bus integration. |
Compared with TMP411AIDGKT and LM95235EVAL/NOPB, TMP401AIDGKT delivers optimal balance of SMBus compatibility, dual open-drain alerts, and ±1°C remote accuracy in the smallest footprint-making it the preferred choice for space-constrained, high-reliability server and networking thermal management.
Availability
TMP401AIDGKT is available at Aetrix Electronics and suitable for server thermal management, telecom infrastructure monitoring, and industrial embedded control requiring stable component supply across extended product lifecycles.
Supply support for TMP401AIDGKT 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 and embedded processing technologies, with over 50 years of innovation in precision sensing, power management, and signal chain solutions.
The TMP401AIDGKT belongs to TI's precision temperature sensor product line, engineered specifically for high-accuracy, dual-point thermal monitoring in computing and communications equipment where junction-level thermal control directly impacts system reliability and performance.
FAQ
What is the maximum remote temperature measurement range supported by the TMP401AIDGKT?
The TMP401AIDGKT supports an extended remote temperature measurement range of –55°C to +150°C when the RANGE bit (bit 2) in the Configuration Register is set to 1. This mode uses offset binary encoding (add 64 decimal to standard binary value) and is validated for use with typical thermal diodes. The device's ambient operating range remains –40°C to +125°C per Absolute Maximum Ratings.
Does the TMP401AIDGKT require calibration for remote temperature accuracy?
No, the TMP401AIDGKT does not require system-level calibration for remote temperature accuracy. Its ±1°C remote accuracy (–40°C to +125°C) is achieved through factory-trimmed ideality factor (η = 1.008) and programmable current sources that cancel series resistance effects up to 3 kΩ. Calibration is unnecessary across multiple IC manufacturers' transistors or diodes per TI SBOS371B datasheet Section 1.
How does the TMP401AIDGKT handle diode fault conditions?
The TMP401AIDGKT detects diode faults-including open circuit, short circuit, and reverse bias-via its internal diagnostic circuitry and sets the Diode Fault bit (bit 0) in the Status Register. When asserted, this flag disables remote temperature reporting and prevents false thermal alerts. The condition persists until cleared by host software via SMBus read of the Status Register, ensuring robust operation in field-deployed systems.
Can the ALERT/THERM2 pin of the TMP401AIDGKT be used as a second independent thermal flag?
Yes, the ALERT/THERM2 pin of the TMP401AIDGKT can be configured as a second independent thermal flag via bit 6 (T2SEL) in the Configuration Register. When T2SEL = 1, ALERT/THERM2 functions identically to the THERM pin-asserting active-low on any overtemperature condition. When T2SEL = 0, it operates as a general-purpose alert output triggered by comparator violations defined in the Interrupt Configuration Register.
What is the minimum conversion time for a full local + remote temperature reading on the TMP401AIDGKT?
The minimum conversion time for a full local + remote temperature reading on the TMP401AIDGKT is 115 ms in one-shot mode. This value is fixed and independent of resolution setting. In continuous conversion mode, the device supports rates from 0.0625 to 8 samples per second, with corresponding quiescent current scaling from 29 µA to 450 µA-allowing trade-offs between responsiveness and power consumption based on thermal dynamics.
TMP401AIDGKT 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:
- 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
TMP401AIDGKT FAQ
1.How can I place an order for TMP401AIDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP401AIDGKT 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 TMP401AIDGKT reliable?
The price and inventory of TMP401AIDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP401AIDGKT is usually 5 days.
3.What payment methods are accepted for TMP401AIDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP401AIDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP401AIDGKT?
TMP401AIDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP401AIDGKT 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 TMP401AIDGKT?
For technical support, including TMP401AIDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP401AIDGKT requirements.
6.How does Aetrix verify that TMP401AIDGKT is sourced from the original manufacturer or authorized distributors?
All TMP401AIDGKT 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 TMP401AIDGKT meets industry standards.
7.What is the process for return or replacement of TMP401AIDGKT?
All TMP401AIDGKT units undergo pre-shipment inspection (PSI). If there is an issue with TMP401AIDGKT, 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 TMP401AIDGKT part is unused and in its original packaging.
Return procedure for TMP401AIDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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