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Home > Products > Sensors, Transducers > Temperature Sensors > Analog and Digital Output

Texas Instruments TMP401AIDGKRG4

Name: TMP401AIDGKRG4
Brand: Texas Instruments
SKU: TMP401AIDGKRG4
Price: 2.40 USD
Availability: InStock
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Part No.:: TMP401AIDGKRG4

Manufacturer:: Texas Instruments

Category:: Analog and Digital Output

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: TMP401AIDGKRG4.pdf

Description:: SENSOR DIGITAL -40C-125C 8VSSOP

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Product details

Overview

TMP401AIDGKRG4 from Texas Instruments is a dual-channel digital temperature sensor IC with ±1°C remote diode sensing accuracy and ±3°C local die temperature measurement, operating over –40°C to +125°C ambient range on 3 V to 5.5 V supply. It integrates SMBus-compatible two-wire interface, programmable 9- to 12-bit resolution, series resistance cancellation, and dual thermal alert outputs (ALERT/THERM2 and THERM) for server thermal management and processor junction monitoring.

For engineers reviewing the TMP401AIDGKRG4 datasheet, TMP401AIDGKRG4 pinout, TMP401AIDGKRG4 application, or TMP401AIDGKRG4 equivalent, key selection criteria include remote diode ideality factor (η = 1.008), SMBus timeout (30–35 ms), open-drain output drive capability (6 mA sink), conversion rate configurability (0.0625–8 samples/s), and VSSOP-8 package compatibility with PCB space-constrained thermal sensing nodes.

Technical Context

The TMP401AIDGKRG4 implements a dual-sensing architecture: a local bandgap-based temperature sensor and a remote delta-V_BE channel that excites external PNP/NPN transistors or integrated thermal diodes using four programmable current sources (6 µA, 12 µA, 60 µA, 120 µA). Its internal register map includes dedicated high/low limit comparators for both channels, status flags, and configuration bits for extended temperature range (–55°C to +150°C) via RANGE bit in Configuration Register.

It supports SMBus Fast Mode (400 kHz) and High-Speed Mode (2.5 MHz), with built-in series resistance cancellation logic that compensates for up to 3 kΩ trace resistance between D+ and D–. The device uses extended binary encoding (offset +64) for sub-zero temperatures and provides 0.0625°C remote resolution and selectable 0.0625°C/0.125°C/0.25°C/0.5°C local resolution via RES1/RES0 bits.

Key Specifications

Parameter	Value and Actual Design Meaning
Remote Accuracy	±1°C at TA = –40°C to +100°C, T_REMOTE = –40°C to +150°C, V+ = 3.3 V - enables direct replacement of legacy thermal sensors without calibration.
Local Accuracy	±3°C over –40°C to +125°C - sufficient for board-level ambient monitoring with no trimming required.
Supply Range	3 V to 5.5 V - compatible with 3.3 V and 5 V system rails without level-shifting.
Quiescent Current	3–10 µA in shutdown mode - supports always-on thermal monitoring in low-power systems.
Conversion Rate	Configurable from 0.0625 to 8 samples/s - balances update latency vs. power consumption per thermal control loop requirement.
Output Interface	SMBus 2.0 compliant (write byte, read byte, send byte, receive byte) - interoperable with standard host controllers without custom firmware.
Thermal Alert Outputs	Two open-drain outputs: ALERT/THERM2 (reconfigurable) and THERM (fixed) - allows independent overtemperature response for CPU and memory subsystems.

Pinout & Package

VSSOP-8 (DGK) package, 3.00 mm × 3.00 mm body size, 0.65 mm pitch, exposed pad not present. Designed for surface-mount reflow assembly and thermal performance optimization in dense PCB layouts.

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 for noise immunity.
2 - D+	Remote sensor positive terminal	Connects to emitter of PNP or collector of NPN transistor; forms one side of remote diode bias path.
3 - D−	Remote sensor negative terminal	Connects to base of PNP or emitter of NPN; differential pair with D+ enables series resistance cancellation.
4 - THERM	Digital output	Active-low open-drain thermal flag; asserts when local or remote temperature exceeds THERM limit; requires external pull-up.
5 - GND	Ground reference	Analog and digital common return; must be low-impedance connection to minimize measurement error.
6 - ALERT/THERM2	Digital output	Reconfigurable active-low open-drain output; defaults to ALERT function (local/remote over/undertemperature); can be set as second THERM flag.
7 - SDA	SMBus bidirectional data line	Open-drain I/O requiring external pull-up; supports multi-drop bus with other SMBus devices.
8 - SCL	SMBus clock input	Open-drain input requiring external pull-up; defines communication timing; tolerant of 2.5 MHz operation.

Key Features

Feature	Design Value
Series resistance cancellation	Compensates for up to 3 kΩ trace resistance between D+ and D−, eliminating need for layout-matched routing in high-noise environments.
Programmable resolution	Local channel: 9-bit (0.5°C) to 12-bit (0.0625°C); remote channel fixed at 12-bit (0.0625°C) - enables trade-off between precision and conversion time.
Diode fault detection	Identifies open-circuit, short-circuit, or reverse-biased conditions on D+/D− inputs and reports via Status Register - prevents false thermal shutdowns.
Extended temperature encoding	Enables –55°C to +150°C measurement range using offset binary format (add 64 to standard binary) - supports industrial and automotive junction monitoring.
SMBus timeout protection	30–35 ms automatic bus recovery after SCL stall - prevents lockup in noisy or long-cable SMBus implementations.

Applications

Server CPU Thermal Monitoring	Desktop GPU Junction Sensing
Use Scenario: Real-time monitoring of Intel Xeon or AMD EPYC processor die temperature using integrated substrate diode. IC Role / Device Role / Timing Role: Remote temperature sensor IC providing 0.0625°C resolution measurements via D+/D− interface with SMBus host polling every 100 ms. Use Value: Enables dynamic fan speed control and throttling decisions within 1°C accuracy without factory calibration or trim resistors.	Use Scenario: Measuring thermal diode voltage of NVIDIA GeForce RTX GPU to prevent thermal throttling during sustained compute loads. IC Role / Device Role / Timing Role: Dual-channel sensor acquiring local board ambient and remote GPU junction temperature simultaneously for differential thermal analysis. Use Value: Supports adaptive cooling algorithms by correlating local ambient drift with remote junction rise, improving system reliability under variable airflow.
Telecom Baseband Processor Sensing	Industrial PLC CPU Module Monitoring
Use Scenario: Monitoring temperature of FPGA-based baseband processing unit in 5G radio equipment operating at –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Remote sensor interfacing with Xilinx Zynq-7000 thermal diode; local sensor tracks enclosure temperature for derating compensation. Use Value: Provides fail-safe thermal shutdown via THERM output when FPGA junction exceeds 105°C, meeting IEC 61508 functional safety requirements.	Use Scenario: Continuous thermal supervision of ARM Cortex-A9 CPU module in DIN-rail mounted programmable logic controller exposed to factory floor heat. IC Role / Device Role / Timing Role: Local sensor tracks PCB temperature rise; remote sensor monitors CPU thermal diode; ALERT output triggers watchdog reset on sustained >95°C condition. Use Value: Eliminates need for discrete thermistors and ADCs, reducing BOM count while maintaining ±1°C remote accuracy across 15-year product lifecycle.

Server CPU Thermal Monitoring

Desktop GPU Junction Sensing

Use Scenario: Real-time monitoring of Intel Xeon or AMD EPYC processor die temperature using integrated substrate diode.

IC Role / Device Role / Timing Role: Remote temperature sensor IC providing 0.0625°C resolution measurements via D+/D− interface with SMBus host polling every 100 ms.

Use Value: Enables dynamic fan speed control and throttling decisions within 1°C accuracy without factory calibration or trim resistors.

Use Scenario: Measuring thermal diode voltage of NVIDIA GeForce RTX GPU to prevent thermal throttling during sustained compute loads.

IC Role / Device Role / Timing Role: Dual-channel sensor acquiring local board ambient and remote GPU junction temperature simultaneously for differential thermal analysis.

Use Value: Supports adaptive cooling algorithms by correlating local ambient drift with remote junction rise, improving system reliability under variable airflow.

Telecom Baseband Processor Sensing

Industrial PLC CPU Module Monitoring

Use Scenario: Monitoring temperature of FPGA-based baseband processing unit in 5G radio equipment operating at –40°C to +85°C ambient.

IC Role / Device Role / Timing Role: Remote sensor interfacing with Xilinx Zynq-7000 thermal diode; local sensor tracks enclosure temperature for derating compensation.

Use Value: Provides fail-safe thermal shutdown via THERM output when FPGA junction exceeds 105°C, meeting IEC 61508 functional safety requirements.

Use Scenario: Continuous thermal supervision of ARM Cortex-A9 CPU module in DIN-rail mounted programmable logic controller exposed to factory floor heat.

IC Role / Device Role / Timing Role: Local sensor tracks PCB temperature rise; remote sensor monitors CPU thermal diode; ALERT output triggers watchdog reset on sustained >95°C condition.

Use Value: Eliminates need for discrete thermistors and ADCs, reducing BOM count while maintaining ±1°C remote accuracy across 15-year product lifecycle.

Equivalent & Alternatives

The following parts are listed as comparable options for similar remote/local digital temperature sensor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM95235CIMMX/NOPB	±1.5°C remote accuracy; 10-bit local resolution; no series resistance cancellation; 1.7 V to 3.6 V supply only.	Limited to low-voltage embedded systems; lacks extended temperature encoding and diode fault detection.	Select when operating below 3 V or when SMBus timeout tolerance is not required.
MAX6642AESA+	±2°C remote accuracy; fixed 11-bit resolution; single thermal alert output; no programmable conversion rate.	Suitable for cost-sensitive consumer electronics where ±2°C accuracy suffices and dual-flag functionality is unnecessary.	Choose for simpler designs needing only basic overtemperature warning without fine-grained resolution control.

Compared with LM95235CIMMX/NOPB and MAX6642AESA+, the TMP401AIDGKRG4 delivers superior remote accuracy (±1°C), full series resistance cancellation, dual independent thermal flags, and wider supply range - making it optimal for high-reliability computing and telecom infrastructure where thermal margin is critical.

Availability

TMP401AIDGKRG4 is available at Aetrix Electronics and suitable for server thermal management, desktop GPU junction sensing, and telecom baseband processor monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TMP401AIDGKRG4 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 TMP401AIDGKRG4 belongs to TI's precision temperature sensor product line, designed specifically for high-accuracy remote diode monitoring in computing, communications, and industrial control systems where calibration-free operation and SMBus integration are essential.

FAQ

What is the remote temperature accuracy specification for TMP401AIDGKRG4 under typical operating conditions?

The TMP401AIDGKRG4 achieves ±1°C remote temperature accuracy at TA = –40°C to +100°C and T_REMOTE = –40°C to +150°C with V+ = 3.3 V. This specification holds across multiple IC manufacturers' transistors without calibration, enabled by its trimmed ideality factor (η = 1.008) and series resistance cancellation circuitry. The TMP401AIDGKRG4 maintains this accuracy even with up to 3 kΩ trace resistance between D+ and D− terminals.

Does TMP401AIDGKRG4 support sub-zero temperature measurement, and how is it encoded?

Yes, the TMP401AIDGKRG4 supports sub-zero temperature measurement down to –55°C using extended binary encoding. When the RANGE bit (bit 2) in the Configuration Register is set high, an offset of 64 (0x40) is added to the standard binary value. For example, –25°C is encoded as 0x27 in the high byte. The TMP401AIDGKRG4 does not auto-reformat existing limit register values upon RANGE bit change - users must manually reprogram limits in the new encoding format.

How many thermal alert outputs does TMP401AIDGKRG4 provide, and what are their functions?

The TMP401AIDGKRG4 provides two dedicated thermal alert outputs: THERM (pin 4) is a fixed-function active-low open-drain output asserting when local or remote temperature exceeds its programmed limit, and ALERT/THERM2 (pin 6) is a reconfigurable active-low open-drain output that defaults to ALERT (over/undertemperature) but can be configured as a second THERM flag. Both require external pull-up resistors and support wired-OR bus sharing with other devices.

What SMBus timing modes does TMP401AIDGKRG4 support, and what are the maximum clock frequencies?

The TMP401AIDGKRG4 supports SMBus Fast Mode (up to 400 kHz) and High-Speed Mode (up to 2.5 MHz). Its timing parameters are fully compliant with SMBus 2.0 specifications, including t_BUF (bus free time), t_HDSTA (hold time after repeated start), and t_F/t_R (data fall/rise times). The device also includes built-in SMBus timeout protection with 30–35 ms recovery window to prevent bus lockup during communication faults.

Can TMP401AIDGKRG4 measure temperature using both discrete transistors and integrated thermal diodes?

Yes, the TMP401AIDGKRG4 is explicitly designed to interface with either discrete NPN/PNP transistors (e.g., 2N3904, 2N3906) or integrated thermal diodes found in microprocessors, FPGAs, and ASICs. It applies precise current sources (6 µA, 12 µA, 60 µA, 120 µA) to the D+/D− terminals and uses delta-V_BE methodology. The TMP401AIDGKRG4's series resistance cancellation and diode fault detection ensure robust operation regardless of sensor type or PCB layout parasitics.

TMP401AIDGKRG4 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:: Discontinued at Digi-Key

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

TMP401AIDGKRG4 FAQ

1.How can I place an order for TMP401AIDGKRG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for TMP401AIDGKRG4 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 TMP401AIDGKRG4 reliable?

The price and inventory of TMP401AIDGKRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP401AIDGKRG4 is usually 5 days.

3.What payment methods are accepted for TMP401AIDGKRG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP401AIDGKRG4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TMP401AIDGKRG4?

TMP401AIDGKRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TMP401AIDGKRG4 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 TMP401AIDGKRG4?

For technical support, including TMP401AIDGKRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP401AIDGKRG4 requirements.

6.How does Aetrix verify that TMP401AIDGKRG4 is sourced from the original manufacturer or authorized distributors?

All TMP401AIDGKRG4 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 TMP401AIDGKRG4 meets industry standards.

7.What is the process for return or replacement of TMP401AIDGKRG4?

All TMP401AIDGKRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TMP401AIDGKRG4, 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 TMP401AIDGKRG4 part is unused and in its original packaging.

Return procedure for TMP401AIDGKRG4:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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