TMP411CDR - ±1°C Remote/Local Temp Sensor | TI | SOIC-8
MPN: TMP411CDR ✓ Hoạt độngTMP411CDR Tóm tắt
A remote and local temperature sensor is a class of digital temperature monitor IC within the broader hierarchy of temperature sensors -> thermal management ICs -> system monitoring. These devices measure the temperature of a remote diode-connected transistor - typically a low-cost NPN or PNP transistor integrated into a microcontroller, microprocessor, or FPGA die - while also measuring ambient temperature at the sensor's own die with an internal local channel.
Key features of the TMP411 include ±1°C remote temperature accuracy and ±1°C local accuracy, a sensing range of -40°C to +125°C, 11-bit resolution, and two unique correction mechanisms: N-factor correction (which compensates for the beta/N-factor of the specific remote transistor) and series-resistance correction (which cancels PCB-trace resistance errors in the D+/D- remote loop). An SMBus ALERT/THERM output supports interrupt-driven thermal fault handling.
Technically, the remote channel uses a two-current-ratio delta-VBE measurement technique; the series-resistance correction cancels up to approximately 100 ohms of parasitic resistance, enabling long or lossy PCB traces to the remote junction. The digital interface operates over SMBus with 2.7 V to 5.5 V logic compatibility, and the temperature data register is read as two bytes for the 11-bit result.
Typical applications include CPU/GPU/FPGA die-temperature monitoring in servers and networking equipment, thermal supervision in industrial automation controllers, and power-supply or power-module temperature reporting where the remote diode sits on a hot component.
Design consideration: place the 0.1 uF input decoupling capacitor close to the V+ pin, and route the D+/D- traces as a twisted or closely coupled pair away from high-dv/dt switching nodes to preserve the ±1°C accuracy specification.
This page synthesizes verified distributor data, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho TMP411CDR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với TMP411CDR (cùng hình factor và footprint) — khác nhau ở Output Type, Packaging, Resolution.
TMP411ADG4
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TMP411CDG4
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
TMP411AIDR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
TMP411CDR Tỷ lệ tối đa & tính chất điện
| Chức năng | Remote and Local Temperature Sensor with N-Factor and Series Resistance Correction |
| Remote Temperature Accuracy | ±1°C |
| Local Temperature Accuracy | ±1°C |
| Sensing Temperature Range | -40°C to +125°C |
| Kiểu đầu ra | SMBus (digital) |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Độ phân giải | 11 bit |
| Sensor Channels | 1 remote diode + 1 local |
| Giao diện | SMBus 2-wire compatible |
| Alert Output | ALERT/THERM function |
| Correction Features | N-factor correction and series-resistance correction |
| Hộp / Vỏ | 8-SOIC (0.154 in, 3.90 mm width) |
| Kiểu lắp đặt | Surface Mount |
| Operating Temperature Grade | -40°C to +125°C |
| Packaging | Tape & Reel (R suffix), Cut Tape (CT) also available |
Cấu hình chân TMP411CDR
| Chân 1 | V+ — Power supply, 2.7 V to 5.5 V |
| Chân 2 | D+ — Remote diode anode / positive sense input |
| Chân 3 | D- — Remote diode cathode / negative sense input |
| Chân 4 | NC — Not connected (per datasheet) |
| Chân 5 | GND — Ground reference |
| Chân 6 | ALERT/THERM — Alert/Thermal fault output (open-drain) |
| Chân 7 | SCL — SMBus serial clock input |
| Chân 8 | SDA — SMBus serial data input/output |
Ứng dụng tiêu biểu
TMP411CDR phù hợp cho 6 Áp dụngs: CPU/GPU/FPGA Die Temperature Monitoring, Server and Data Center Thermal Management, Industrial Automation Controllers, Networking and Telecom Equipment, Power Supply and Power Module Monitoring, FPGA and ASIC Reference Designs.
CPU/GPU/FPGA Die Temperature Monitoring
The TMP411CDR is purpose-built for monitoring the junction temperature of processors, GPUs, and FPGAs that integrate a diode-connected sensing transistor. Its ±1°C remote accuracy across -40°C to +125°C and 11-bit resolution resolve sub-degree die-temperature changes, while N-factor correction adapts the measurement to the specific beta of the processor's internal transistor. Series-resistance correction cancels up to roughly 100 ohms of motherboard trace resistance in the D+/D- loop, preserving accuracy over long routing. The sensor sits on the SMBus between the 3.3 V rail and the system BMC, and the ALERT/THERM pin drives interrupt-driven throttling or shutdown. This delivers closed-loop fan control and overheat protection without adding switching noise to the measured die.
Được đề xuất
Server and Data Center Thermal Management
In rack servers and storage systems, multiple hot spots - CPU, chipset, VRM FETs, and drive controllers - must be supervised by the BMC over SMBus. The TMP411CDR fits this role with a 2.7 V to 5.5 V supply compatible with 3.3 V server logic, an SMBus interface addressable in a multi-drop bus, and an ALERT/THERM output that signals thermal excursions to the management controller without polling. The ±1°C accuracy on both local and remote channels supports derating curves and predictive fan-speed algorithms, while series-resistance correction tolerates long, thin PCB traces to remote junctions on daughter cards. Placed near the target with a 0.1 uF decoupling capacitor, it provides continuous 11-bit thermal telemetry for data center reliability.
Được đề xuất
Industrial Automation Controllers
Industrial PLC I/O cards, motor drives, and process controllers operate from -40°C to +125°C environments where component derating must be actively monitored. The TMP411CDR covers the full industrial range with ±1°C accuracy and an SMBus digital output immune to analog noise on crowded control boards. Its remote channel can track the temperature of a power transistor or an FPGA supervisor via a diode-connected junction, while the local channel reports board ambient for cold-junction-adjacent compensation tasks. Series-resistance correction is valuable in industrial cabinets where the remote diode sits on a separate heatsink or power board connected by cabling. The ALERT output enables hardware-level over-temperature interlocks independent of the main controller firmware.
Được đề xuất
Networking and Telecom Equipment
Switches, routers, and optical line cards densely pack hot ASICs that expose internal sensing diodes. The TMP411CDR provides ±1°C remote monitoring of these junctions over an SMBus shared with power supervisors and fan controllers, using only a 2-wire bus and the 3.3 V rail. Its 11-bit resolution gives fan-control loops the fine granularity needed to balance acoustic noise against thermal margin, and the THERM trip output provides a fast hardware path to throttle line-card traffic before a thermal shutdown. Series-resistance correction keeps the measurement accurate even when the D+/D- pair crosses backplane connectors and several inches of lossy routing - a common constraint in blade and line-card architectures.
Được đề xuất
Power Supply and Power Module Monitoring
AC-DC power supplies, DC-DC brick modules, and hot-swap controllers benefit from junction-level thermal supervision of their control ICs and power stages. The TMP411CDR monitors a diode-connected transistor thermally coupled to the hot component while its local channel tracks the cooler supervisory board. With a -40°C to +125°C sensing range and ±1°C accuracy, it supports thermal shutdown thresholds and efficiency-optimization telemetry. The SMBus output integrates directly with PMBus-adjacent supervision logic, and series-resistance correction accommodates the resistive isolation often present between the sensor and a diode mounted on a power module. Place the sensor with its decoupling capacitor near the power stage and route D+/D- as a coupled pair.
Được đề xuất
FPGA and ASIC Reference Designs
FPGA development boards and custom ASIC platforms commonly dedicate a remote-diode sensor to track die temperature for dynamic frequency/voltage scaling and thermal-aware place-and-route studies. The TMP411CDR suits this with its ±1°C remote accuracy, 11-bit data word, and simple SMBus register map read by the onboard microcontroller. N-factor correction ensures accuracy across different FPGA process generations whose sensing-diode ideality differs, while series-resistance correction tolerates the series impedance of FPGA-package-internal traces. The ALERT/THERM pin can gate FPGA clocks directly, providing a hardware thermal-protect path that operates even if the soft firmware hangs - a recommended safety practice in reference designs.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho TMP411CDR — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | TMP411ADG4 | TMP411CDG4 | TMP411AIDR |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC (D) | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Resolution | 11 bit | 11 bit | 11 bit | 11 bit |
| N-Factor / Series-R Correction | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes |
| Interface | SMBus | SMBus | SMBus | SMBus |
| Packaging | Tape & Reel (R) | Tube/tray (G4 suffix) | Tube/tray (G4 suffix) | Tape & Reel (R) |
Bảo phân biệt quan trọng
- Dual correction set (N-factor + series resistance) (vsTMP75AIDR)
- Standard C-grade accuracy in tape-and-reel (vsTMP411ADG4)
- Wide 2.7 V to 5.5 V supply compatibility (vs3.3 V-only digital sensors)
Ghi chú thiết kế
Route the D+ and D- remote-sense traces as a tightly coupled pair (or twisted pair if cabled) and keep total loop resistance low. Although the TMP411's series-resistance correction cancels parasitic trace resistance (approximately 100 ohm tolerance per the family description), excessive or asymmetric resistance still erodes the ±1°C remote accuracy. Avoid running the pair adjacent to switching-regulator inductors or high-dv/dt clock nets; if crossing is unavoidable, cross at 90 degrees.
Decouple the V+ pin (pin 1, 2.7 V to 5.5 V) with a 0.1 uF ceramic capacitor placed within a few millimeters of the pin, plus a bulk capacitor if shared with a noisy rail. SMBus systems should include the standard bus pull-up resistors (typically 2.2 k to 10 k depending on bus capacitance) on SCL and SDA, and an open-drain pull-up on the ALERT/THERM output. Ensure the 3.3 V or 5 V rail is stable before the host begins SMBus transactions to avoid bus lockup.
Do not confuse TMP411 grade suffixes: C, A, and B grades differ in temperature accuracy grading, and the D variant offers ±0.8°C remote accuracy per the datasheet title. Verify the grade on your BOM matches the accuracy you designed to. Also, the remote transistor must be diode-connected with known N-factor - if using an unknown discrete transistor, verify the N-factor correction register setting against the TI datasheet selection guidance, or remote readings may be systematically offset even though the circuit appears functional.
Thông tin tuân thủ
Compliance status not stated in the verified web data retrieved for this page; consult the TI product page quality section for RoHS/REACH certification details.
