Texas Instruments TMP411CD

Overview

TMP411CD from Texas Instruments is a dual-channel ±1°C-accurate remote/local temperature sensor IC with integrated diode bias, series resistance cancellation, and programmable N-factor correction. It operates from 2.7V to 5.5V across –40°C to +125°C, supports I²C/SMBus interface, and delivers 9–12-bit programmable resolution - used for precision thermal monitoring in server motherboard CPU/GPU zones.

For engineers reviewing the TMP411CD datasheet, TMP411CD pinout, TMP411CD application, or TMP411CD equivalent, this page provides verified package mapping (SOIC-8), confirmed remote diode error compensation capability, SMBus timing compliance at 400 kHz/3.4 MHz, local/remote accuracy specs per temperature zone, and validated alternative options for thermal management in enterprise compute platforms.

Technical Context

The TMP411CD implements a two-wire SMBus-compatible interface with four configurable I²C addresses (A/B/C/E), enabling multi-sensor bus topology without address conflict. Its analog front-end includes dedicated D+ and D– inputs for remote diode sensing, with on-chip current sources and programmable ideality factor (η = 1.008) to correct non-ideal transistor behavior.

It features dual alert outputs (THERM and ALERT/THERM2), both open-drain and pullup-requiring, supporting overtemperature shutdown signaling and independent thermal event flagging. Internal offset registers allow system-level calibration of local and remote channels, while series resistance cancellation compensates for PCB trace impedance up to 3 kΩ.

Key Specifications

Pinout & Package

Package: SOIC-8 (TI package designator D), 4.9 mm × 6.0 mm × 1.75 mm nominal body size, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADT7461AARQZ and TMP451AIRUNR, the TMP411CD uniquely combines wide 2.7V–5.5V operation, SOIC-8 compatibility, and on-the-fly series resistance/N-factor correction - making it the only option that preserves accuracy across varying PCB layouts and supply domains without firmware recalibration.

Availability

TMP411CD is available at Aetrix Electronics and suitable for rack server motherboard thermal management, smart NIC temperature supervision, and wireless infrastructure baseband unit (BBU) power amplifier monitoring requiring stable component supply and long-term industrial lifecycle support.

Supply support for TMP411CD 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 leadership in precision analog sensing and power management ICs.

The TMP411 product line was designed specifically for high-accuracy thermal monitoring in enterprise computing and communications infrastructure, addressing the need for robust remote diode sensing with minimal system-level calibration effort.

FAQ

What is the remote temperature accuracy specification for TMP411CD across its full operating range?

The TMP411CD achieves ±1°C remote temperature accuracy from 15°C to 75°C (TDIODE = –40°C to 150°C) at V+ = 3.3V. Outside this zone, accuracy degrades: ±3°C from –40°C to 100°C and ±5°C at 125°C ambient. These values are measured with less than 5Ω effective series resistance and 100pF differential capacitance, per TI SBOS383E datasheet Section 6.5.

Does TMP411CD support SMBus timeout and clock stretching, and what are the timing limits?

Yes, TMP411CD fully supports SMBus timeout (25–35 ms) and clock stretching. Its SCL clock frequency range spans 0.001 MHz to 3.4 MHz, with t(LOW) ≥ 1300 ns and t(HIGH) ≥ 600 ns in Fast Mode. The device complies with SMBus 2.0 specifications, including send/receive byte commands and alert response protocol - all verified in Section 6.7 and 6.8 of the TMP411CD datasheet.

How does the series resistance cancellation feature work in TMP411CD, and what is its maximum supported value?

The TMP411CD implements hardware-based series resistance cancellation by measuring voltage drop across D+ and D– under two different current source settings, then digitally subtracting the IR error term. It supports up to 3 kΩ series resistance - sufficient to compensate for typical PCB trace lengths in server motherboard layouts. This function is enabled by default and requires no user configuration, as documented in Section 7.3.3 of the TMP411CD datasheet.

Can TMP411CD be used with both NPN and PNP transistors as remote sensors, and are there any layout requirements?

Yes, TMP411CD supports both NPN and PNP remote diode configurations. For PNP transistors (e.g., 2N3906), connect emitter to D+, collector to D–, and base to GND. For NPN, reverse the connections. Layout requires matched D+/D– trace lengths (<10 mm), minimized loop area, and separation from noisy power planes - details are specified in Section 9.4 (Layout) of the TMP411CD datasheet.

What is the function of the ALERT/THERM2 pin on TMP411CD, and how is it configured?

The ALERT/THERM2 pin on TMP411CD is a reconfigurable open-drain digital output that defaults to ALERT mode (active-low interrupt on temperature threshold breach). It can be software-configured via the Configuration Register (bit 3) to operate as a second THERM flag. Both outputs require external pull-up to V+ and support independent limit registers - enabling dual-zone thermal protection without additional logic, as defined in Section 8.6 of the TMP411CD datasheet.