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Texas Instruments TMP411CDGKT
- Part No.:
- TMP411CDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TMP411CDGKT.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:163
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Product details
Overview
TMP411CDGKT from Texas Instruments is a dual-channel ±1°C accurate remote/local temperature sensor IC with I²C/SMBus interface, programmable 9–12-bit resolution, and integrated series resistance cancellation and N-factor correction. It operates from 2.7V to 5.5V over –40°C to +125°C and is used for precision thermal monitoring of microprocessors, FPGAs, and server motherboard VRMs.
For engineers reviewing the TMP411CDGKT datasheet, TMP411CDGKT pinout, TMP411CDGKT application, or TMP411CDGKT equivalent, this page delivers verified electrical specs, package mapping (VSSOP-8), diode fault detection capability, alert/thermal flag behavior, and real-world calibration features including offset registers and programmable thresholds.
Technical Context
The TMP411CDGKT integrates a local thermal transistor and supports remote sensing via external diode-connected transistors (e.g., 2N3906 PNP) with configurable ideality factor (η = 1.008) and series resistance compensation up to 3 kΩ. Its SMBus-compliant two-wire interface supports standard write byte, read byte, send byte, and receive byte commands.
It implements dual digital outputs - ALERT/THERM2 (reconfigurable open-drain) and THERM (dedicated thermal flag) - both requiring external pull-up resistors to V+. Conversion timing is fixed at 115 ms (legacy chip) or 35 ms (new chip) per channel in one-shot mode, with programmable conversion rate and resolution affecting average current draw.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±1°C over 15°C to 85°C at 3.3V - enables direct thermal throttling decisions without system-level calibration |
| Remote Accuracy | ±1°C over –40°C to 100°C (TDIODE) - supports reliable die-temperature tracking across CPU/FPGA junctions |
| Supply Range | 2.7V to 5.5V - compatible with standard 3.3V and 5V rail systems without LDO dependency |
| Interface | I²C/SMBus - supports up to 3.4 MHz clock, 25–35 ms timeout, and 4 selectable slave addresses (A1/A0 pins) |
| Resolution | Programmable 9–12 bits (local), 12 bits (remote) - balances measurement granularity vs. conversion time (115 ms typical) |
| Power Consumption | 28 µA avg @ 0.0625 Hz (legacy chip); 1.5 µA avg @ same rate (new chip) - enables low-duty-cycle thermal polling in battery-sensitive designs |
| Operating Temp | –40°C to +125°C ambient - validated for industrial and enterprise server environments |
Pinout & Package
VSSOP-8 package (3.0 mm × 4.9 mm × 1.1 mm), thin-profile surface-mount, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Power supply input | Positive supply rail (2.7V–5.5V); powers internal circuitry and provides pull-up reference for open-drain outputs |
| D+ | Analog input | Positive terminal for remote diode sensor; connects to emitter/base of PNP or collector of NPN transistor |
| D– | Analog input | Negative terminal for remote diode sensor; completes bias path for remote junction measurement |
| THERM | Digital output | Active-low open-drain thermal alert; asserts when local temp exceeds THERM limit register value |
| GND | Ground reference | Analog and digital ground return; must be low-impedance connection to minimize measurement error |
| ALERT/THERM2 | Digital output | Reconfigurable active-low open-drain output; defaults to ALERT but can be set as second thermal flag via configuration register |
| SDA | Bidirectional data line | SMBus/I²C serial data; requires external pull-up to V+; supports standard and fast-mode protocols |
| SCL | Digital input | SMBus/I²C serial clock; open-drain input requiring external pull-up; defines timing for all bus transactions |
Key Features
| Feature | Design Value |
|---|---|
| Series Resistance Cancellation | Compensates for PCB trace resistance up to 3 kΩ in remote diode path, eliminating measurement offset without hardware modification |
| Programmable N-Factor | Adjusts ideality factor (η) to match specific transistor characteristics (e.g., 2N3906 PNP), improving remote accuracy by >0.5°C |
| User Offset Registers | Two independent 8-bit offset registers (local + remote) enable per-unit calibration to achieve <±0.5°C system-level accuracy |
| Diode Fault Detection | Automatically identifies open-circuit, short-circuit, or leakage faults on D+/D– lines and flags status in dedicated register bit |
| Multiple Alert Outputs | Dual open-drain outputs (THERM + ALERT/THERM2) allow independent thermal event routing to PMIC, FPGA, or host controller interrupt lines |
Applications
| Rack Server Motherboard Thermal Management | Smart NIC Temperature Monitoring |
|---|---|
Use Scenario: Real-time monitoring of CPU VRM, memory DIMM, and chipset hotspots across multi-slot 1U/2U servers. IC Role / Device Role / Timing Role: Local sensor tracks ambient board temperature; remote channel reads diode-integrated processor die temperature via dedicated sense pins. Use Value: Enables dynamic fan speed control and early overtemperature shutdown before thermal throttling impacts compute performance. | Use Scenario: Thermal supervision of high-speed SerDes lanes, PHYs, and packet processing ASICs on PCIe-based network interface cards. IC Role / Device Role / Timing Role: Remote sensing of ASIC junction temperature using on-die diodes; local channel monitors card-edge connector temperature rise. Use Value: Prevents link degradation and packet loss due to thermal-induced signal integrity loss in 25G/100G Ethernet interfaces. |
| Baseband Unit (BBU) in Small Cell Infrastructure | FPGA-Based Software Defined Radio (SDR) |
Use Scenario: Compact outdoor baseband units operating in uncontrolled ambient conditions (–40°C to +70°C) with high-power RF amplifiers. IC Role / Device Role / Timing Role: Dual-channel measurement: local for enclosure air temperature, remote for power amplifier transistor junction via external diode. Use Value: Supports adaptive RF output power scaling to maintain EVM compliance and prevent thermal runaway during peak traffic loads. | Use Scenario: Field-programmable gate arrays implementing real-time signal processing in military/comms radios where thermal drift affects ADC/DAC linearity. IC Role / Device Role / Timing Role: Remote sensor tracks FPGA die temperature using internal diode; local channel monitors heatsink-to-PCB interface gradient. Use Value: Triggers reconfiguration of critical DSP blocks when junction temperature exceeds 95°C, preserving signal fidelity and timing margins. |
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 |
|---|---|---|---|
| ADT7461AARQZ | Pin- and register-compatible with TMP411; identical 8-pin SOIC/VSSOP footprint; ±1°C local/remote accuracy; supports same SMBus commands and register map | Designed for Intel platform thermal management; includes additional CPU-specific features like PROCHOT# support not present in TMP411CDGKT | Select ADT7461AARQZ only when interfacing with legacy Intel chipset thermal control logic requiring PROCHOT# handshake |
| TMP451AIRTER | Lower supply range (1.7V–3.6V); ±1°C remote accuracy only up to 105°C; SOT-23-8 package; 12-bit fixed resolution; no series resistance cancellation | Optimized for ultra-low-power portable devices; lacks N-factor tuning and diode fault detection; unsuitable for high-accuracy server applications | Choose TMP451AIRTER only for space-constrained, single-supply battery-powered systems where full TMP411CDGKT feature set is unnecessary |
Compared with ADT7461AARQZ and TMP451AIRTER, TMP411CDGKT offers broader supply voltage tolerance (2.7–5.5V), full series resistance cancellation, and robust diode fault detection - making it the preferred choice for enterprise-grade thermal monitoring where accuracy, configurability, and reliability are prioritized over platform-specific integration.
Availability
TMP411CDGKT is available at Aetrix Electronics and suitable for rack server motherboard design, smart NIC thermal management, and small cell baseband unit development requiring stable component supply and long-term industrial lifecycle support.
Supply support for TMP411CDGKT 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 over 50 years of innovation in precision sensing and power management.
The TMP411 product line was engineered for high-accuracy thermal monitoring in enterprise computing and communications infrastructure, delivering calibrated remote sensing with minimal external components and robust noise immunity.
FAQ
What is the maximum remote diode temperature range supported by the TMP411CDGKT?
The TMP411CDGKT supports remote diode temperature measurement from –40°C to +150°C. This range is validated for diode-connected transistors such as the 2N3906 PNP and applies across the full ambient operating range (–40°C to +125°C) and supply voltage (2.7V to 5.5V). Accuracy degrades outside the ±1°C band beyond 100°C, reaching ±3°C at 125°C and ±5°C at 150°C per datasheet Section 6.5.
Does the TMP411CDGKT require external calibration to achieve ±1°C accuracy?
No, the TMP411CDGKT achieves ±1°C local and remote accuracy over 15°C to 85°C without system-level calibration. Factory-trimmed internal references and on-chip compensation (including series resistance cancellation and programmable N-factor) eliminate the need for external calibration. User offset registers are provided for fine-tuning if required, but are optional for most applications meeting the specified operating conditions.
Can the ALERT and THERM outputs of the TMP411CDGKT drive standard logic inputs directly?
No - both ALERT/THERM2 and THERM are open-drain outputs requiring external pull-up resistors to V+. They cannot source current and must be pulled to a valid logic-high level (e.g., 3.3V or 5V) to interface with CMOS or TTL inputs. The recommended pull-up resistor is 4.7 kΩ for 3.3V systems, ensuring VOL ≤ 0.4 V at 6 mA sink current per datasheet Section 6.5.
How does the TMP411CDGKT handle series resistance in the remote diode path?
The TMP411CDGKT implements hardware-based series resistance cancellation using dual-current-source measurement. It applies high/medium/low remote sensor source currents (120 µA / 60 µA / 6 µA) and calculates correction based on voltage differentials across D+ and D–. This eliminates offset errors caused by PCB trace resistance up to 3 kΩ without software intervention or external circuitry, as confirmed in Section 7.3.4 of the datasheet.
Is the TMP411CDGKT compatible with standard I²C controllers, or does it require SMBus-specific hardware?
The TMP411CDGKT is fully compatible with standard I²C controllers. It supports standard I²C protocol (write byte, read byte, etc.) and operates at up to 3.4 MHz in Fast Mode Plus. While it also complies with SMBus timing and command sets (e.g., send/receive byte), no SMBus-specific hardware is required - generic I²C master peripherals (e.g., MCU GPIO-based bit-banging or hardware I²C modules) can communicate with TMP411CDGKT without modification.
TMP411CDGKT 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:
- 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-VSSOP
TMP411CDGKT FAQ
1.How can I place an order for TMP411CDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP411CDGKT 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 TMP411CDGKT reliable?
The price and inventory of TMP411CDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP411CDGKT is usually 5 days.
3.What payment methods are accepted for TMP411CDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP411CDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP411CDGKT?
TMP411CDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP411CDGKT 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 TMP411CDGKT?
For technical support, including TMP411CDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP411CDGKT requirements.
6.How does Aetrix verify that TMP411CDGKT is sourced from the original manufacturer or authorized distributors?
All TMP411CDGKT 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 TMP411CDGKT meets industry standards.
7.What is the process for return or replacement of TMP411CDGKT?
All TMP411CDGKT units undergo pre-shipment inspection (PSI). If there is an issue with TMP411CDGKT, 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 TMP411CDGKT part is unused and in its original packaging.
Return procedure for TMP411CDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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