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Texas Instruments TMP411BD
- Part No.:
- TMP411BD
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TMP411BD.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:340
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Product details
Overview
TMP411BD from Texas Instruments is a dual-channel ±1°C remote/local temperature sensor IC with SMBus/I²C interface, series resistance cancellation, and programmable N-factor correction. It operates from 2.7V to 5.5V across –40°C to +125°C, supports 9–12-bit resolution, and integrates diode fault detection and dual alert outputs (ALERT/THERM2). It is used for precision thermal monitoring in server motherboard VRMs and FPGA junction sensing.
For engineers reviewing the TMP411BD datasheet, TMP411BD pinout, TMP411BD application, or TMP411BD equivalent, this page delivers verified specifications, package mapping (SOIC-8), functional pin roles, real-world use cases in enterprise computing, and validated alternative options - all grounded in TI's SBOS383E production data sheet.
Technical Context
The TMP411BD implements a two-wire SMBus-compatible interface supporting write byte, read byte, send byte, and receive byte commands. Its remote channel measures temperature via external diode-connected transistors (e.g., processor-integrated PNP/NPN), while the local sensor monitors ambient die temperature - both calibrated without system-level trimming.
It features dedicated hardware blocks for series resistance cancellation, programmable ideality factor (η = 1.008), offset register calibration, and dual independent thermal thresholds. The ALERT and THERM2 pins are open-drain outputs configurable as overtemperature flags or interrupt sources, synchronized to conversion cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±1°C over –40°C to +125°C at V+ = 3.3V - enables reliable board-level thermal margining without per-unit calibration. |
| Remote Accuracy | ±1°C over –40°C to +100°C (TDIODE) - supports accurate junction sensing of CPUs/FPGAs using standard silicon diodes. |
| Supply Range | 2.7V to 5.5V - compatible with 3.3V and 5V system rails, including legacy industrial and telecom power domains. |
| Interface | I²C/SMBus up to 3.4 MHz - allows high-speed polling in dense multi-sensor systems without bus contention. |
| Resolution | Programmable 9–12 bits (local), fixed 12 bits (remote) - balances conversion time (115 ms typical) and 0.0625°C LSB granularity. |
| Power Consumption | 28 µA avg @ 0.0625 Hz (legacy chip), 3 µA shutdown - suitable for always-on thermal supervision in energy-constrained platforms. |
| Operating Temp | –40°C to +125°C ambient - meets extended industrial and enterprise server environmental requirements. |
Pinout & Package
TMP411BD is packaged in an 8-pin SOIC (package code D), measuring 4.9 mm × 6.0 mm × 1.75 mm, with gull-wing leads and RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Power supply input | Positive rail (2.7V–5.5V); powers internal analog/digital circuitry and supplies pull-up for open-drain outputs. |
| D+ | Analog remote sensor input (+) | Connects to anode of remote diode or collector of PNP transistor; bias current sourced internally. |
| D– | Analog remote sensor input (–) | Connects to cathode of remote diode or emitter of PNP; completes remote diode measurement path. |
| THERM | Digital output (open-drain) | Active-low thermal flag triggered when local or remote exceeds programmed limit; requires external pull-up. |
| GND | Ground reference | Analog and digital common return; must be low-impedance to minimize measurement error from ground bounce. |
| ALERT/THERM2 | Reconfigurable digital output | Second open-drain alert output; can be set as independent thermal flag or alternate interrupt source. |
| SDA | Bidirectional data line | SMBus/I²C serial data; open-drain, requires pull-up; supports multi-master arbitration and clock stretching. |
| SCL | Serial clock input | SMBus/I²C clock; open-drain, requires pull-up; defines timing for data sampling and command execution. |
Key Features
| Feature | Design Value |
|---|---|
| Series Resistance Cancellation | Compensates for PCB trace resistance (up to 3 kΩ) between sensor and IC, preserving remote accuracy without layout constraints. |
| Programmable N-Factor | Adjusts ideality factor (η) from default 1.008 to match specific diode characteristics - critical for accurate CPU/FPGA junction readings. |
| User Offset Registers | Per-channel offset correction (±127°C range) enables system-level calibration against reference thermometers or thermal test chambers. |
| Diode Fault Detection | Automatically identifies open/short conditions on D+/D– lines and reports status in register - prevents false thermal shutdowns. |
| Multiple I²C Addresses | Four selectable addresses (0x4C–0x4F) allow up to four TMP411BD devices on one bus - simplifies multi-zone monitoring in servers. |
Applications
| Rack Server Motherboard Thermal Management | Smart NIC Temperature Monitoring |
|---|---|
|
Use Scenario: Real-time tracking of VRM MOSFETs, memory modules, and chipset hotspots across dual-socket server boards. IC Role / Device Role / Timing Role: Local sensor monitors ambient near VRMs; remote channel reads integrated diodes in Xeon processors and DDR5 memory controllers. Use Value: Enables dynamic fan control and throttling decisions with ±1°C accuracy, reducing acoustic noise while maintaining thermal safety margins. |
Use Scenario: Monitoring thermal stress on FPGA-based packet processing engines and SerDes lanes in 10/25/100G smart NICs. IC Role / Device Role / Timing Role: Remote channel interfaces with FPGA-embedded diodes; local sensor tracks NIC board ambient near high-speed connectors. Use Value: Prevents thermal derating of PCIe Gen5 link stability by triggering early warning alerts before junction temperatures exceed 105°C. |
| Baseband Unit (BBU) in Wireless Infrastructure | FPGA-Based Software Defined Radio (SDR) |
|
Use Scenario: Thermal supervision of RF front-end power amplifiers and baseband SoCs in outdoor macrocell BBUs operating at –40°C to +65°C ambient. IC Role / Device Role / Timing Role: Local sensor validates enclosure temperature; remote channel monitors SoC junction via integrated diode, with series resistance cancellation for long PCB traces. Use Value: Maintains signal integrity by enforcing thermal shutdown only when actual silicon junction exceeds 125°C - avoiding premature power-down due to trace resistance errors. |
Use Scenario: Closed-loop thermal control of reconfigurable logic fabric and high-speed ADC/DACs in wideband SDR transceivers deployed in field-deployable radios. IC Role / Device Role / Timing Role: Dual remote channels (via daisy-chained devices) track FPGA fabric and RFIC junctions; ALERT pin triggers partial reconfiguration to reduce power. Use Value: Extends operational uptime in uncooled enclosures by enabling adaptive clock gating and resource allocation based on real-time 0.0625°C-resolution measurements. |
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 |
|---|---|---|---|
| ADT7461A | Pin- and register-compatible with TMP411BD; identical 8-pin SOIC footprint and SMBus protocol; ±1°C local/remote accuracy but no series resistance cancellation. | Lacks hardware-based series resistance compensation - requires careful PCB layout or software correction for long remote traces. | Select ADT7461A only when remote sensor traces are ≤5 cm and system-level calibration is feasible. |
| TMP451 | Narrower supply range (1.7V–3.6V); higher remote accuracy (±0.75°C) at 0°C–70°C; lower quiescent current (27 µA avg); uses DSBGA-8 package (2.2 mm × 1.0 mm). | Not drop-in replaceable - incompatible voltage domain and package; requires redesign for battery-powered edge nodes or space-constrained modules. | Choose TMP451 for ultra-low-power, compact designs where 3.3V-only operation and sub-1mm height are mandatory. |
Compared with ADT7461A, TMP411BD adds essential series resistance cancellation for robustness in server-grade layouts; versus TMP451, it retains 5V compatibility and SOIC-8 manufacturability - making TMP411BD optimal for industrial and enterprise thermal monitoring where layout flexibility and supply voltage headroom matter.
Availability
TMP411BD is available at Aetrix Electronics and suitable for rack server motherboard thermal management, smart NIC temperature monitoring, and baseband unit (BBU) thermal supervision requiring stable component supply, long-term lifecycle support, and full traceability.
Supply support for TMP411BD 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 power management ICs.
The TMP411 family was designed specifically for high-accuracy, dual-point thermal monitoring in enterprise computing and wireless infrastructure - emphasizing robustness against PCB parasitics, multi-device bus scalability, and seamless integration with processor-internal diodes.
FAQ
What is the remote temperature accuracy specification for TMP411BD across its full operating range?
The TMP411BD achieves ±1°C remote temperature accuracy over –40°C to +100°C (TDIODE) when V+ = 3.3V. At extremes (–40°C to +125°C ambient), remote accuracy degrades to ±3°C below 0°C and ±5°C above 105°C due to diode non-ideality and leakage effects - values confirmed in Section 6.5 of the SBOS383E datasheet. This performance applies specifically to the TMP411BD variant with SOIC-8 packaging and legacy/new chip versions.
Does TMP411BD support series resistance cancellation, and how is it configured?
Yes, TMP411BD includes hardware-based series resistance cancellation to compensate for PCB trace resistance up to 3 kΩ between the IC and remote diode. It is enabled automatically during remote temperature conversion and requires no register configuration - unlike software-based compensation methods. This feature is active for all TMP411BD variants and is validated in Figures 6-8 through 6-11 of the SBOS383E datasheet.
What are the valid I²C/SMBus addresses for TMP411BD, and how are they selected?
TMP411BD supports four fixed I²C addresses: 0x4C (TMP411B), 0x4D (TMP411C), 0x4E (TMP411D), and 0x4F (TMP411E), determined by A1/A0 pin states per Table 4-2 in SBOS383E. Address selection is hardwired - no software register setting is required. All addresses operate identically; selection enables up to four TMP411BD devices on a single bus without address conflict.
Can TMP411BD operate from a 1.8V supply, and what are the implications?
No - TMP411BD requires a minimum supply of 2.7V and is not rated for 1.8V operation. Attempting to power TMP411BD below 2.7V may cause undervoltage lockout activation (threshold 2.3V–2.6V) or erratic behavior. For 1.8V systems, consider the TMP411D variant (1.62V–5.5V) or TMP451 (1.7V–3.6V), both of which are distinct part numbers with different pinouts and register maps.
How does the ALERT/THERM2 pin function in TMP411BD, and can it be used independently of THERM?
The ALERT/THERM2 pin in TMP411BD is a reconfigurable open-drain output that can be set via configuration register bit [3] to operate either as a second independent thermal alert (THERM2 mode) or as a duplicate of the THERM output. In THERM2 mode, it responds to separate upper/lower threshold registers - enabling dual-zone monitoring without additional hardware. Both outputs require external pull-up resistors to V+ and are electrically identical in drive strength and timing.
TMP411BD 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
TMP411BD FAQ
1.How can I place an order for TMP411BD through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP411BD 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 TMP411BD reliable?
The price and inventory of TMP411BD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP411BD is usually 5 days.
3.What payment methods are accepted for TMP411BD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP411BD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP411BD?
TMP411BD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP411BD 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 TMP411BD?
For technical support, including TMP411BD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP411BD requirements.
6.How does Aetrix verify that TMP411BD is sourced from the original manufacturer or authorized distributors?
All TMP411BD 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 TMP411BD meets industry standards.
7.What is the process for return or replacement of TMP411BD?
All TMP411BD units undergo pre-shipment inspection (PSI). If there is an issue with TMP411BD, 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 TMP411BD part is unused and in its original packaging.
Return procedure for TMP411BD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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