TMP411ADR - ±1°C Remote/Local Temp Sensor | TI | SOIC-8
MPN: TMP411ADR ✓ פעילTMP411ADR סקירה
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.
חלופות תחליף ישיר עבור TMP411ADR — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם TMP411ADR (אותו גורם צורה וטביעת רגל) — שונים ב Interface, Output Type, Packaging, Resolution, Alert Output.
TMP411CDR
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←TMP411ADRG4
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
TMP411BDGKR
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←TMP411AQDGKRQ1
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←TMP411CQDGKRQ1
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←TMP411ADR דירוגים מרביים ומאפיינים חשמליים
| סוג חיישן | Remote and Local Temperature Sensor |
| Local Sensor Accuracy | ±1°C |
| Remote Sensor Accuracy | ±1°C |
| Sensing Temperature Range | -40°C to +125°C |
| רזולוציה | 11 bit (0.0625°C LSB) |
| Supply Voltage Range | 2.7 V to 5.5 V |
| סוג ממשק | I2C, SMBus (2-wire serial) |
| סוג פלט | Digital, SMBus; ALERT and THERM outputs |
| N-Factor Correction | Programmable non-ideality (N-factor) correction |
| Series Resistance Correction | Yes |
| מארז / Case | 8-SOIC (0.154 in, 3.90 mm width) |
| סוג הרכבה | Surface Mount |
| Packaging | Tape & Reel |
| טווח טמפרטורת פעולה | -40°C to +125°C |
| סטטוס RoHS | Compliant |
| Brand / Manufacturer | Texas Instruments |
תצורת פינים של TMP411ADR
| פין 1 | D+ — Remote temperature sensor diode positive input |
| פין 2 | D- — Remote temperature sensor diode negative input |
| פין 3 | ALERT — SMBus alert interrupt output, out-of-limit temperature flag |
| פין 4 | GND — Ground reference |
| פין 5 | NC — Not connected (per datasheet) |
| פין 6 | NC — Not connected (per datasheet) |
| פין 7 | VS — Power supply, 2.7 V to 5.5 V |
| פין 8 | THERM — THERM comparator/hot-limit output for fan or shutdown control |
יישומים טיפוסיים
TMP411ADR מתאים עבור 6 יישוםs: 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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור TMP411ADR — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | 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 |
מבדילים עיקריים
- Tighter remote accuracy grade available in same family footprint (לעומתTMP411CDR)
- Programmable N-factor and series-resistance correction (לעומתTMP75AIDR)
- Hardware THERM comparator output (לעומתTMP411ADRG4)
- AEC-Q100 automotive option for harsh environments (לעומתTMP411AQDGKRQ1)
הערות תכנון
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.
מידע על תאימות
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.
