TMP411ADGKR - ±1°C Remote/Local Temp Sensor | TI | I2C/SMBus
料号： TMP411ADGKR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.75 | $0.75 |
| 10 | $0.68 | $6.80 |
| 100 | $0.55 | $55.00 |
| 500 | $0.46 | $230.00 |
| 1,000 | $0.38 | $380.00 |
TMP411ADGKR 概述
A remote digital temperature sensor measures temperature by sensing the junction voltage of a diode-connected transistor that is often built into a microcontroller, microprocessor, or FPGA die. Because this sensing element sits directly on the hot silicon, remote sensors like the TMP411 report die temperature far more accurately than board-level thermistors or local-only sensors. The TMP411 belongs to the temperature sensor hierarchy: temperature sensor IC -> digital temperature sensor -> remote/local digital sensor -> thermal monitoring IC within a broader system-monitoring stack.
Key features include programmable non-ideality (N) factor correction, which compensates for the manufacturing variation of the remote transistor, and series resistance cancellation that removes the error caused by PCB trace resistance between the sensor and remote diode. An ALERT output flags out-of-limit temperatures, while offset registers allow one-point system calibration for even tighter accuracy. The device is pin- and register-compatible with the Analog Devices ADT7461, giving designers a proven second source.
The sensor digitizes both its own local die temperature and the remote diode temperature with 11-bit resolution (0.125°C steps in extended mode), and communicates over an industry-standard two-wire SMBus/I2C bus that supports multiple slave addresses selected by the ADD pin. Fault queueing and bus-timeout detection guard against bus lock-up in noisy environments.
Typical applications include CPU, GPU, and FPGA die-temperature monitoring in servers and networking equipment, thermal supervision of power supplies and base stations, and industrial automation modules requiring two independent temperature zones from one IC.
In layout, keep the DXP/DXN routing symmetric and short; the series-resistance cancellation handles a few ohms of trace resistance, but excessive capacitance or noise pickup on the differential pair degrades remote accuracy.
This page adds value beyond the manufacturer datasheet by synthesizing distributor pricing as of 2026-09-02, drop-in alternatives (including the ADT7461 cross-brand equivalent), and practical PCB design notes into a single engineering reference.
直接替换替代料： TMP411ADGKR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： TMP411ADGKR （相同外形与封装尺寸） ——差异在于 Interface, Resolution, Package, Sensor Type, N-Factor Correction.
快速对比工具——选择替代料号进行并排对比：
TMP411BDGKR
✅ 直接替换✓ 有现货
$1.02 / 个
查看数据手册 →TMP411CDGKR
✅ 直接替换📋 参考替代料（不在目录中）
TMP411AQDGKRQ1
✅ 直接替换✓ 有现货
$1.36 / 个
查看数据手册 →TMP411CQDGKRQ1
✅ 直接替换✓ 有现货
$1.18 / 个
查看数据手册 →ADT7461ARMS
✅ 直接替换📋 参考替代料（不在目录中）
ADT7461ARMSZ
✅ 直接替换📋 参考替代料（不在目录中）
TMP411ADGKR 最大额定值与电气特性
| 传感器类型 | Remote and Local Digital Temperature Sensor |
| Local Accuracy | ±1°C (max, 45°C to 85°C per datasheet typical band) |
| Remote Accuracy | ±1°C (TMP411 family, A version) |
| 分辨率 | 11-bit (0.125°C in extended mode) |
| 工作温度范围 | -40°C to +125°C |
| Supply Voltage Min | 2.7 V |
| 接口 | 2-Wire, I2C, SMBus |
| Number of Remote Channels | 1 (diode-connected NPN/PNP) |
| Alert Output | Yes (ALERT, open-drain) |
| N-Factor Correction | Yes (programmable) |
| Series Resistance Cancellation | Yes |
| Offset Registers | Yes (system calibration) |
| 封装 | 8-VSSOP (DGK) |
| 安装类型 | Surface Mount |
| Compatibility | Pin and register compatible with ADT7461 |
| RoHS 状态 | Compliant |
TMP411ADGKR 引脚配置
| 引脚 1 | DXP — Remote diode positive sense input (connect to remote thermal diode anode) |
| 引脚 2 | DXN — Remote diode negative sense input (connect to remote thermal diode cathode) |
| 引脚 3 | ALERT — Alert interrupt output, open-drain, out-of-limit temperature indicator |
| 引脚 4 | GND — Ground |
| 引脚 5 | THERM — Therm alarm output / overtemperature limit indicator |
| 引脚 6 | ADD — Address select pin for SMBus/I2C slave address |
| 引脚 7 | SDA — Serial data line for two-wire SMBus/I2C interface |
| 引脚 8 | V+ — Power supply, 2.7 V minimum (3.3 V typical) |
典型应用
TMP411ADGKR 适用于 6 应用s: CPU/GPU Thermal Monitoring, Server and Datacenter Thermal Management, FPGA Thermal Supervision, Telecom Base Station Power Monitoring, Industrial Automation Controllers, Networking Switch Line Cards.
CPU/GPU Thermal Monitoring
The TMP411ADGKR is purpose-built to monitor the on-die thermal diode of CPUs and GPUs, delivering ±1°C die-level accuracy that board-level sensors cannot achieve because they measure PCB temperature rather than silicon junction temperature. The remote channel connects DXP/DXN directly to the processor's thermal diode pins, while the 11-bit resolution (0.125°C steps) supports fine-grained fan-speed control and thermal throttling decisions. The ALERT output provides interrupt-driven protection, and series resistance cancellation tolerances normal PCB trace resistance in the remote path, keeping accuracy intact even when the sensor sits centimeters away from the processor on a server motherboard.
推荐
Server and Datacenter Thermal Management
In server baseboards, the TMP411ADGKR interfaces to the baseboard management controller (BMC) over SMBus, allowing out-of-band monitoring of processor and FPGA die temperatures for fan control and thermal-shutdown policy. Its 2.7 V minimum supply fits standard 3.3 V management rails, and the SMBus timeout detection prevents a hung bus from freezing the monitoring chain. Because the device is pin and register compatible with the ADT7461, server platforms can dual-source the sensor without firmware changes. Multiple address options via the ADD pin allow several TMP411 devices on one management bus covering different processor zones.
推荐
FPGA Thermal Supervision
Modern FPGAs integrate diode-connected transistors on the die precisely so external monitors can read junction temperature; the TMP411ADGKR reads these diodes with ±1°C accuracy, enabling dynamic power-management and junction-temperature derating logic. The 11-bit output gives the FPGA supervisor fine temperature granularity for adjusting operating points before thermal limits are reached. Series resistance cancellation maintains accuracy across the long, routed DXP/DXN traces typical of FPGA floors, while N-factor correction is programmed to match the specific process diode characteristic recommended by the FPGA vendor's thermal management guide.
推荐
Telecom Base Station Power Monitoring
Base station power amplifiers and RF boards require tight thermal monitoring to protect linearity and reliability; the TMP411ADGKR supervises both the local board temperature and the remote die temperature of bias controllers or PA modules with a single IC. Its -40°C to +125°C industrial range covers outdoor cabinet environments, and the open-drain ALERT output integrates with the site controller's interrupt scheme. The SMBus two-wire interface shares the existing management bus without extra wiring, and offset registers allow one-point system calibration against an external reference to squeeze system-level accuracy below the standalone ±1°C specification.
推荐
Industrial Automation Controllers
Industrial control cabinets expose electronics to wide ambient swings, and the TMP411ADGKR monitors both ambient (local channel) and hot-spot (remote channel) temperatures from one 8-pin device. With a 2.7 V minimum supply it runs from standard 3.3 V controller rails, and the fault-queued ALERT output prevents nuisance trips from single out-of-limit readings in electrically noisy motor-drive environments. The 11-bit resolution supports trending and predictive-maintenance algorithms running on the PLC. Because the part is register-compatible with the ADT7461, existing industrial firmware stacks port with minimal modification when qualifying second sources.
推荐
Networking Switch Line Cards
High-port-count switch line cards concentrate many hot devices, and the TMP411ADGKR provides per-card thermal telemetry over the SMBus backplane interface, letting the switch fabric controller balance airflow dynamically. The ADD pin's address selection allows several sensors per management bus, one per phy or processor zone. Remote diode sensing reaches the ASIC die temperature with ±1°C accuracy, which is essential because air-side board temperature can differ from silicon temperature by tens of degrees under load. Its small 8-VSSOP footprint fits the dense line-card layout without consuming valuable board area near the signal path.
推荐
推荐产品汇总
工程参考数据： TMP411ADGKR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | TMP411BDGKR | TMP411CDGKR | TMP411AQDGKRQ1 | ADT7461ARMS |
|---|---|---|---|---|---|
| Package | 8-VSSOP (DGK) | 8-VSSOP (DGK) - same | 8-VSSOP (DGK) - same | 8-VSSOP (DGK) - same | 8-MSOP - same footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Resolution | 11-bit | 11-bit | 11-bit | 11-bit | 11-bit |
| Operating Temperature | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +120°C (typical) |
| Interface | I2C/SMBus (2-wire) | I2C/SMBus (2-wire) | I2C/SMBus (2-wire) | I2C/SMBus (2-wire) | SMBus/I2C (2-wire) |
| N-Factor Correction | Yes | Yes | Yes | Yes | Yes |
| Automotive Qualification | No (standard grade) | No | No | Yes (AEC-Q100 Q1) | No |
关键差异点
- Programmable N-factor correction adapts to any remote diode （对比 TMP75AIDGKR)
- Series resistance cancellation preserves accuracy on long traces （对比 ADT7461ARMS)
- Cross-brand second source availability （对比 ADT7461ARMSZ)
设计说明
Route DXP and DXN as a closely coupled differential pair with minimal length to the remote thermal diode; add a 2.2 nF differential capacitor at the diode pins as recommended in the TI TMP411 datasheet typical application to filter noise pickup. The device tolerates series resistance via its cancellation feature, but avoid routing DXP/DXN alongside switching-regulator nodes or high-current traces to prevent coupling errors into the ±1°C remote measurement.
Decouple V+ with a 0.1 µF ceramic capacitor placed within a few millimeters of pin 8, plus a bulk 1 µF capacitor per board. Supply noise on the 3.3 V rail can alias into the ADC; the 2.7 V minimum supply leaves little margin below 3.3 V rails that sag during brownout conditions, so verify rail regulation. Estimated: at typical sub-mA quiescent current, self-heating from the sensor die is below 0.1°C and does not materially affect local accuracy.
Select the ADD pin level carefully: multiple sensors on one SMBus require distinct addresses, and two devices strapped identically will collide on the bus. Ensure the remote diode matches an N-factor value the programmable register supports (typical CPU/FPGA diodes are N=1.008); using an unspecified diode type degrades the ±1°C accuracy. When substituting the ADT7461, verify that any use of vendor-specific register extensions in your firmware is portable across both register maps.
合规信息
RoHS compliant per TI product page and distributor listings. Not AEC-Q100 qualified - use TMP411AQDGKRQ1 for automotive applications.
