TMP411ADR - ±1°C Remote/Local Temp Sensor | TI | SOIC-8
MPN： TMP411ADR ✓ 啟用中TMP411ADR 概覽
A remote/local temperature sensor is a monitoring IC within the broader power-management and thermal-management hierarchy of an electronic system. Unlike a standalone thermistor or analog-output sensor, it digitizes temperature internally and reports readings over a two-wire bus, allowing a host controller to poll multiple thermal zones, trigger alerts, and throttle clocks or fans before damage occurs. Remote-junction sensing is essential because the hottest point in modern electronics is usually the silicon die itself, not the PCB surface.
Key features include ±1°C remote diode accuracy, programmable non-ideality (N-factor) correction that lets the device match different processor thermal diodes, and series-resistance cancellation that removes D+/D- PCB trace resistance error. An ALERT output flags out-of-limit readings while a THERM output provides a comparator-style hot-limit signal for direct fan or shutdown control.
Architecturally, the TMP411 uses a delta-sigma ADC to convert the ratio of two diode forward currents into a digital temperature code with 0.0625°C LSB (11-bit), and applies digital correction factors for beta and series resistance.
Typical applications include CPU/FPGA/GPU die temperature monitoring in servers and networking equipment, thermal supervision in industrial automation, and fan-speed control loops in power supplies and base stations.
Design consideration: keep D+ and D- traces short, routed as a differential pair away from switching noise, since series resistance and coupled noise directly degrade remote accuracy.
This page adds value beyond the datasheet by consolidating distributor pricing, drop-in alternatives, comparison tables, and practical design notes in one place.
直接替換替代品，適用於 TMP411ADR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： TMP411ADR （相同外形與佔位） — 差異在於 Interface, Output Type, Packaging, Resolution, Alert Output.
TMP411CDR
✅ 直接替換聯絡詢價
查看資料表 →TMP411ADRG4
✅ 直接替換📋 參考替代品（不在目錄中）
TMP411BDGKR
✅ 直接替換聯絡詢價
查看資料表 →TMP411AQDGKRQ1
✅ 直接替換聯絡詢價
查看資料表 →TMP411CQDGKRQ1
✅ 直接替換聯絡詢價
查看資料表 →TMP411ADR 最大額定值與電氣特性
| 感測器類型 | Remote and Local Temperature Sensor |
| Local Sensor Accuracy | ±1°C |
| Remote Sensor Accuracy | ±1°C |
| Sensing Temperature Range | -40°C to +125°C |
| 解析度 | 11 bit (0.0625°C LSB) |
| Supply Voltage Range | 2.7 V to 5.5 V |
| 介面類型 | I2C, SMBus (2-wire serial) |
| 輸出類型 | Digital, SMBus; ALERT and THERM outputs |
| N-Factor Correction | Programmable non-ideality (N-factor) correction |
| Series Resistance Correction | Yes |
| 封裝 / 外殼 | 8-SOIC (0.154 in, 3.90 mm width) |
| 安裝類型 | Surface Mount |
| Packaging | Tape & Reel |
| 工作溫度範圍 | -40°C to +125°C |
| RoHS 狀態 | Compliant |
| Brand / Manufacturer | Texas Instruments |
TMP411ADR 腳位配置
| 腳位 1 | D+ — Remote temperature sensor diode positive input |
| 腳位 2 | D- — Remote temperature sensor diode negative input |
| 腳位 3 | ALERT — SMBus alert interrupt output, out-of-limit temperature flag |
| 腳位 4 | GND — Ground reference |
| 腳位 5 | NC — Not connected (per datasheet) |
| 腳位 6 | NC — Not connected (per datasheet) |
| 腳位 7 | VS — Power supply, 2.7 V to 5.5 V |
| 腳位 8 | THERM — THERM comparator/hot-limit output for fan or shutdown control |
典型應用
TMP411ADR 適用於 6 應用s: CPU/FPGA Die Temperature Monitoring, Server and Data Center Thermal Management, Networking and Telecom Equipment, Industrial Automation and Motor Drives, Power Supply and Battery Charger Protection, Test and Measurement Instrumentation.
CPU/FPGA Die Temperature Monitoring
The TMP411ADR is purpose-built for monitoring the on-die thermal diode of CPUs, FPGAs, and microprocessors. Its programmable N-factor correction matches the sensing algorithm to the specific non-ideality of the target transistor, while series-resistance cancellation tolerates several ohms of D+/D- trace resistance without accuracy loss - critical when the sensor sits centimeters from the processor. Placed on the same board with D+ and D- routed as a short differential pair, it reports 11-bit (0.0625°C) die readings over SMBus so the host EC or BMC can throttle clocks or log thermal trends. The ALERT flag gives an immediate interrupt on out-of-limit temperatures, enabling protective action before thermal shutdown.
推薦
Server and Data Center Thermal Management
In servers and storage systems, the TMP411ADR provides the remote-junction telemetry that BMC/IPMC controllers need for fan control and predictive thermal management. The SMBus interface integrates directly with baseboard management controllers supporting PEC-enabled SMBus transactions, and the THERM comparator output can drive fan circuits directly for hardware-level protection independent of firmware. Because the TMP411 family offers multiple accuracy grades in shared footprints, one PCB design can be cost-optimized per thermal criticality. Its 2.7V to 5.5V supply range connects to any common standby or main rail, and low supply current keeps idle power within server efficiency targets.
推薦
Networking and Telecom Equipment
Routers, switches, and base-station hardware concentrate heat in ASICs and optical modules, making remote diode sensing essential. The TMP411ADR watches the ASIC thermal diode while its local channel tracks board ambient, giving the system controller two independent thermal data points from one IC. Series-resistance correction preserves ±1°C remote accuracy even on backplane-level D+/D- runs, and the ALERT output supports interrupt-driven thermal shutdown in redundant systems. The wide -40°C to +125°C range covers outdoor telecom enclosures, and SMBus compatibility allows multiple sensors on a shared 2-wire bus for zone-by-zone monitoring.
推薦
Industrial Automation and Motor Drives
Industrial drives, PLCs, and power modules benefit from the TMP411ADR's combination of die-level and board-level sensing. The remote channel can monitor an IGBT-gate-driver or MCU thermal diode while the local channel tracks the PCB near power stages. With 11-bit resolution (0.0625°C LSB), closed-loop fan or derating algorithms respond to small temperature gradients before hard limits are hit. The device's digital output avoids the calibration and ADC-loading issues of thermistor-based designs, and the ALERT/THERM outputs provide fail-safe hardware thresholds that operate even if the main controller is busy or hung, satisfying industrial safety-over-temperature requirements.
推薦
Power Supply and Battery Charger Protection
AC-DC supplies, DC-DC modules, and battery chargers use the TMP411ADR as a low-cost supervisory channel: the THERM output can gate the converter or charger when the MOSFET/transformer area exceeds a programmed limit, and the ALERT output notifies the primary controller for logging and graceful shutdown. The 2.7V to 5.5V supply range works from auxiliary bias rails common in offline supplies. Because the local sensor requires no external components and the remote channel needs only two traces to a diode-connected transistor, thermal protection is added with minimal BOM impact, replacing multiple discrete thermistor-comparator circuits.
推薦
Test and Measurement Instrumentation
Bench supplies, data-acquisition modules, and environmental loggers use the TMP411ADR for self-diagnostic temperature telemetry. The 11-bit output and ±1°C accuracy provide resolution adequate for compensation and safety logging, while the digital SMBus output eliminates analog front-end errors. Series-resistance and N-factor correction make readings trustworthy regardless of sensor-diode type or wiring, which matters in instruments where a probe diode may be mounted remotely on a device under test. Multiple TMP411 devices share one SMBus segment, letting a rack instrument monitor several slots with a single controller interface.
推薦
推薦產品摘要
工程參考資料，適用於 TMP411ADR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TMP411CDR | TMP411ADRG4 | TMP411BD | TMP411AQDGKRQ1 |
|---|---|---|---|---|---|
| Package | 8-SOIC (D), 3.90 mm width | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same | VSSOP-8 (DGK) - different footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Remote Accuracy | ±1°C | ±1°C | ±1°C | ±0.8°C | ±1°C |
| Sensing Range | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C |
| 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 | 2.7 V to 5.5 V |
| Interface | I2C, SMBus | I2C, SMBus | I2C, SMBus | I2C, SMBus | I2C, SMBus |
| N-Factor / Series-R Correction | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes |
主要差異化特點
- Tighter remote accuracy grade available in same family footprint (對比TMP411CDR)
- Programmable N-factor and series-resistance correction (對比TMP75AIDR)
- Hardware THERM comparator output (對比TMP411ADRG4)
- AEC-Q100 automotive option for harsh environments (對比TMP411AQDGKRQ1)
設計說明
Route D+ and D- as a tightly coupled pair (side-by-side, same length) from the TMP411ADR to the remote diode, and use the device's series-resistance correction as budget headroom rather than a license for long traces - keep total loop resistance low for best accuracy. Place a 0.1uF ceramic decoupling capacitor directly across pins 7 (VS) and 4 (GND), within 2 mm of the pins. Guard the D+/D- pair away from switching-regulator inductors, gate-drive nodes, and clock lines to prevent rectified noise offsets in the remote reading.
Program the N-factor register to match the specific thermal diode of your CPU/FPGA; using the default non-ideality with a mismatched diode shifts the remote reading by several degrees. Do not substitute a Schottky diode for the required diode-connected NPN/PNP transistor on D+/D-. When multiple SMBus slaves share the bus, verify address assignment and enable SMBus timeout recovery so a hung sensor cannot lock the bus. Always tie unused NC pins (5, 6) floating per datasheet - do not use them as PCB test points for adjacent nets.
The TMP411ADR local channel measures its own die temperature, which includes self-heating from supply current plus thermal gradient error versus the intended measurement point. For board-ambient readings, place the sensor away from power components (inductors, MOSFETs, LDOs) and provide ground-plane copper under the SOIC-8 to couple the die to the board rather than local hot spots. The remote channel, by contrast, measures the target die directly and is immune to sensor placement gradients - prefer remote readings for critical thermal decisions.
On long SMBus runs (backplanes, multi-slot racks), add 2.2k to 4.7k pull-up resistors sized for bus capacitance, and enable the digital filter/timeout features to reject coupled transients. If high-frequency switching noise is unavoidable near D+/D-, a small (e.g., 100 pF to 1 nF, low-K) differential capacitor across D+/D- at the sensor pins can filter coupled noise without excessive slowing of the diode current excitation - validate remote accuracy at both cold and hot limits after adding any filter capacitance.
合規資訊
RoHS compliance indicated by the G4 material designation convention and distributor listings; the AEC-Q100 qualified members of this family carry the Q1 suffix (e.g., TMP411AQDGKRQ1). Verify REACH and halogen-free status on TI's product quality pages.
