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Texas Instruments TMP411AD
- Part No.:
- TMP411AD
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TMP411AD.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:244
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Product details
Overview
TMP411AD from Texas Instruments is a dual-channel ±1°C remote/local temperature sensor IC with I²C/SMBus interface, programmable 9–12-bit resolution, and integrated series resistance cancellation for diode-connected transistor sensing. It operates from 2.7V to 5.5V across –40°C to +125°C and is used in rack server motherboard thermal monitoring, FPGA die temperature tracking, and wireless infrastructure baseband units.
For engineers reviewing the TMP411AD datasheet, TMP411AD pinout, TMP411AD application, or TMP411AD equivalent, this page delivers verified technical context, package-specific pin functions, real-world calibration features (N-factor correction, offset registers), and validated alternatives for thermal management in high-density computing systems.
Technical Context
The TMP411AD implements a two-wire SMBus-compatible interface supporting write byte, read byte, send byte, and receive byte commands for configuration and temperature reads. Its remote sensing channel uses diode-connected transistors (e.g., NPN/PNP) embedded in processors or FPGAs, with built-in series resistance cancellation and programmable non-ideality factor (η = 1.008) to correct for parasitic PCB trace resistance and transistor non-ideal behavior.
It features dual alert outputs (ALERT/THERM2 and THERM), programmable threshold limits, diode fault detection, and user-defined offset registers for system-level calibration. The device supports four I²C addresses (A/B/C/E variants) and maintains register compatibility with ADT7461 and ADM1032 for legacy design migration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±1°C over 15°C to 85°C at V+ = 3.3V - enables precise ambient board temperature measurement without per-unit calibration |
| Remote Accuracy | ±1°C over –40°C to 100°C (TDIODE = –40°C to 150°C) - ensures reliable CPU/FPGA junction temperature tracking under thermal stress |
| Supply Range | 2.7V to 5.5V - compatible with standard 3.3V and 5V system rails, eliminating need for dedicated LDOs |
| Resolution | Programmable 9–12 bits (local), fixed 12 bits (remote) - allows trade-off between conversion time (115 ms typical) and LSB resolution (0.0625°C) |
| Interface | I²C/SMBus up to 3.4 MHz - supports fast polling in multi-sensor thermal control loops without bus contention |
| Operating Temp | –40°C to +125°C ambient - qualified for industrial and telecom equipment operating in uncontrolled environments |
| Power Consumption | 28 µA avg @ 0.0625 Hz (legacy chip), 1.5 µA avg @ same rate (new chip) - extends battery life in low-duty-cycle monitoring applications |
Pinout & Package
TMP411AD is available in SOIC-8 (D package, 4.9 mm × 6.0 mm) and VSSOP-8 (DGK package, 3.0 mm × 4.9 mm). Pin functions are identical across both packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Power supply input | Positive rail (2.7V–5.5V); powers internal ADC, digital logic, and remote bias current source |
| D+ | Analog remote sensor input (+) | Connects to collector/emitter of diode-connected transistor; supplies bias current (up to 120 µA) |
| D– | Analog remote sensor input (–) | Completes remote diode measurement path; enables differential sensing to reject common-mode noise |
| THERM | Digital output (open-drain) | Active-low thermal flag; asserts when local temp exceeds programmable THERM limit - used for hardware shutdown |
| GND | Ground reference | Analog and digital ground return; must be low-impedance to minimize measurement error from IR drop |
| ALERT/THERM2 | Digital output (open-drain, reconfigurable) | Second alert output; can be set as remote overtemp flag or alternate THERM function - supports dual-threshold safety schemes |
| SDA | Bidirectional data line | SMBus/I²C data line; requires external pull-up to V+; supports multi-master arbitration and clock stretching |
| SCL | Input clock line | SMBus/I²C clock input; open-drain with external pull-up; defines timing for all serial transactions |
Key Features
| Feature | Design Value |
|---|---|
| Series resistance cancellation | Compensates for PCB trace resistance up to 3 kΩ in remote diode path - eliminates calibration drift caused by layout parasitics |
| Programmable N-factor correction | Adjusts ideality factor (η) to match actual transistor characteristics (default η = 1.008) - improves accuracy across process/voltage/temperature corners |
| User-defined offset register | Allows per-system calibration offset (±128 LSB) to null out board-level thermal gradients or sensor placement errors |
| Diode fault detection | Automatically identifies open-circuit, short-circuit, or reversed diode connections - prevents false temperature readings in field-deployed systems |
| Multiple I²C addresses | Four selectable addresses (A/B/C/E) enable up to four TMP411AD devices on same bus - simplifies multi-zone thermal monitoring without address jumpers |
Applications
| Rack Server Motherboard Thermal Management | FPGA Die Temperature Monitoring |
|---|---|
Use Scenario: Real-time thermal mapping of CPU, memory, VRMs, and PCIe slots on enterprise server motherboards. IC Role / Device Role / Timing Role: Local sensor measures ambient board temperature; remote channel reads diode-connected transistors inside Xeon CPUs and DDR4 memory controllers. Use Value: Enables dynamic fan speed control and thermal throttling with ±1°C accuracy, preventing thermal runaway while maximizing performance headroom. | Use Scenario: Continuous junction temperature monitoring of high-end FPGAs (e.g., Xilinx Virtex/UltraScale) during compute-intensive workloads. IC Role / Device Role / Timing Role: Remote channel interfaces directly with FPGA-embedded thermal diodes; local channel monitors heatsink proximity. Use Value: Supports adaptive voltage/frequency scaling (AVFS) and safe operating area (SOA) enforcement using factory-trimmed diode parameters. |
| Small Cell Base Station RF Front-End | Smart NIC Thermal Protection |
Use Scenario: Thermal supervision of power amplifiers, LNAs, and RF transceivers in outdoor 5G small cell units exposed to wide ambient swings. IC Role / Device Role / Timing Role: Local sensor tracks enclosure temperature; remote channel monitors PA die via integrated transistor diode. Use Value: Maintains RF output stability and linearity by triggering gain reduction or shutdown before thermal derating thresholds are exceeded. | Use Scenario: Overtemperature protection for high-speed network interface cards with onboard PHYs, SerDes, and packet processors. IC Role / Device Role / Timing Role: Dual alert outputs drive independent hardware reset lines for PHY and controller subsystems. Use Value: Prevents packet loss and link flapping by isolating thermal faults to specific NIC subcomponents rather than full-board reset. |
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 |
|---|---|---|---|
| TMP411BD | Same accuracy, package, and feature set; differs only in I²C address (1001101b vs TMP411AD's 1001100b) | Identical use cases; selected when multiple sensors require unique bus addresses on shared SMBus | Drop-in replacement if address conflict exists; no layout or firmware changes required |
| ADT7461A | ±2°C local/remote accuracy; lacks series resistance cancellation and N-factor correction; 10-bit resolution | Lower-cost thermal monitoring where ±2°C tolerance is acceptable and PCB trace resistance is minimal | Choose for cost-sensitive designs with simpler thermal requirements and no need for advanced diode compensation |
Compared with TMP411BD, TMP411AD offers identical performance but enables deterministic bus addressing in multi-sensor systems; versus ADT7461A, it delivers tighter accuracy, enhanced diode compensation, and higher resolution - critical for high-performance computing thermal control.
Availability
TMP411AD is available at Aetrix Electronics and suitable for rack server motherboard thermal management, FPGA die temperature tracking, and small cell base station RF front-end applications requiring stable component supply and long-term industrial-grade availability.
Supply support for TMP411AD 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 expertise in precision sensing and thermal management ICs.
The TMP411AD belongs to TI's high-accuracy temperature sensor family designed specifically for demanding thermal monitoring in enterprise servers, telecom infrastructure, and programmable logic platforms where reliability and measurement fidelity are critical.
FAQ
What is the remote temperature accuracy specification for TMP411AD?
The TMP411AD achieves ±1°C remote temperature accuracy over –40°C to +100°C ambient (TDIODE = –40°C to +150°C) at V+ = 3.3V. This specification applies to diode-connected transistors from multiple manufacturers without system-level calibration, supported by series resistance cancellation and programmable N-factor correction in the TMP411AD.
Does TMP411AD support both I²C and SMBus protocols?
Yes, TMP411AD supports both I²C and SMBus protocols. It accepts SMBus write byte, read byte, send byte, and receive byte commands and operates at clock frequencies up to 3.4 MHz. Its VIH/VIL thresholds (2.1V/0.8V) and timeout behavior (25–35 ms) comply with SMBus 2.0 specifications, making TMP411AD interoperable with standard SMBus controllers.
How does the series resistance cancellation feature work in TMP411AD?
The TMP411AD implements hardware-based series resistance cancellation by measuring voltage drops across D+ and D– with two different bias currents, then digitally subtracting the parasitic IR contribution. This compensates for up to 3 kΩ of series resistance in the remote diode path - a key capability that maintains ±1°C accuracy even with long PCB traces, as confirmed in TMP411AD electrical characterization data.
What package options are available for TMP411AD?
TMP411AD is offered in two industry-standard packages: SOIC-8 (package code D, 4.9 mm × 6.0 mm) and VSSOP-8 (package code DGK, 3.0 mm × 4.9 mm). Both share identical pinout and electrical specifications. The SOIC variant suits through-hole or high-power layouts; the VSSOP variant enables compact, high-density routing in space-constrained server and telecom modules.
Can TMP411AD replace ADT7461 or ADM1032 in existing designs?
Yes, TMP411AD is pin- and register-compatible with ADT7461 and ADM1032, enabling direct substitution in legacy thermal monitoring circuits. Firmware updates may be needed to leverage advanced TMP411AD features like series resistance cancellation and N-factor correction, but basic temperature readout and alert functionality operate identically - simplifying upgrade paths for server and networking OEMs maintaining older designs.
TMP411AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -64°C ~ 191°C
- Output Type:
- I2C/SMBus
- Voltage - Supply:
- 2.7V ~ 5.5V
- Resolution:
- 11 b
- Features:
- One-Shot, Output Switch, Programmable Limit, Programmable Resolution, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±1°C (±2.5°C)
- Test Condition:
- 15°C ~ 85°C (-40°C ~ 125°C)
- Operating Temperature:
- -55°C ~ 127°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
TMP411AD FAQ
1.How can I place an order for TMP411AD through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP411AD 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 TMP411AD reliable?
The price and inventory of TMP411AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP411AD is usually 5 days.
3.What payment methods are accepted for TMP411AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP411AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP411AD?
TMP411AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP411AD 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 TMP411AD?
For technical support, including TMP411AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP411AD requirements.
6.How does Aetrix verify that TMP411AD is sourced from the original manufacturer or authorized distributors?
All TMP411AD 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 TMP411AD meets industry standards.
7.What is the process for return or replacement of TMP411AD?
All TMP411AD units undergo pre-shipment inspection (PSI). If there is an issue with TMP411AD, 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 TMP411AD part is unused and in its original packaging.
Return procedure for TMP411AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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