TMP411-Q1 - ±1°C Remote/Local Temp Sensor | Texas Instruments
MPN: TMP411-Q1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.15 | $2.15 |
| 10 | $1.9 | $19.00 |
| 100 | $1.55 | $155.00 |
| 500 | $1.3 | $650.00 |
| 1,000 | $1.1 | $1,100.00 |
TMP411-Q1 Overview
A temperature sensor converts thermal energy into an electrical signal for monitoring and control. The TMP411-Q1 belongs to the digital temperature sensor class, outputting 12-bit readings over an I2C/SMBus two-wire interface instead of an analog voltage. Within the thermal-management hierarchy it sits as a remote/local digital sensor monitor within the broader sensor and power-management families used across automotive, industrial, and computing platforms.
Key features include programmable non-ideality (N) factor and series-resistance cancellation, which compensate for external transistor non-idealities and PCB trace resistance to preserve accuracy across the full range. Programmable resolution and threshold limits, minimum/maximum temperature monitors, diode fault detection, and a temperature alert function complete the feature set.
Technically, the TMP411-Q1 uses an internal ADC to measure the voltage across a diode-connected remote transistor, typically NPN/PNP devices embedded in MCUs, MPUs, or FPGAs. N-factor correction adjusts for the ideality factor of the external transistor, while series-resistance correction cancels line-resistance error. SMBus timeout and alert-response support improve bus robustness, and low shutdown quiescent current (approximately 8 uA) suits always-on automotive nodes.
Typical applications include automotive battery management systems, engine control units, infotainment processors, and CPU/GPU thermal monitoring in embedded and data-center systems, where accurate remote junction sensing directly protects performance and reliability.
Design tip: keep remote-sense traces short and routed as a differential pair away from noise, configure the N-factor and series-resistance registers to match the external transistor, and use pull-ups on the open-drain I2C and alert lines. Prices shown are as of 2026-08-29.
Drop-in alternatives for TMP411-Q1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TMP411-Q1 (same form factor and footprint) — differing in Interface, Resolution, Sensor Type, N-Factor Correction, Local Temperature Accuracy.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TMP411D-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
TMP411ADGKR
✅ Drop-In✓ In Stock
$0.38 / Unit
View Datasheet →TMP451-Q1
⚡ Same Package📋 Reference alternative (not in catalog)
ADM1032A
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX6654
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TMP411-Q1 Maximum Ratings & Electrical Characteristics
| Sensor Type | Digital, Local/Remote Temperature Sensor |
| Local Temperature Accuracy | ±1°C |
| Remote Temperature Accuracy | ±1°C (±0.8°C for TMP411D-Q1) |
| Local Measurement Range | -40°C to +125°C |
| Remote Measurement Range | up to 150°C |
| Supply Voltage | 2.7 V to 5.5 V |
| Interface | I2C/SMBus two-wire |
| Resolution | Up to 12-bit (programmable) |
| Shutdown Quiescent Current | approximately 8 uA |
| N-Factor Correction | Yes (programmable) |
| Series Resistance Cancellation | Yes |
| Alert Outputs | THERM and ALERT/THERM2 (open-drain) |
| Fault Detection | Diode fault detection |
| Package | 8-VSSOP (DGK), 3x3 mm |
| Operating Temperature | -40°C to +125°C |
| Qualification | AEC-Q100 qualified (automotive) |
| Mounting Type | Surface Mount |
TMP411-Q1 Pin Configuration
| Pin 1 | D- — Remote diode cathode (negative sense input) |
| Pin 2 | D+ — Remote diode anode (positive sense input) |
| Pin 3 | THERM — Open-drain over-temperature output (requires pull-up to V+) |
| Pin 4 | GND — Ground |
| Pin 5 | ALERT/THERM2 — Open-drain alert / second threshold output (requires pull-up) |
| Pin 6 | ADD0 — I2C/SMBus address select pin |
| Pin 7 | SCLK — Serial clock (I2C/SMBus) |
| Pin 8 | SDATA — Serial data (I2C/SMBus) |
Typical Applications
TMP411-Q1 is suitable for 6 applications: Automotive Battery Management Systems, Engine Control Units (ECU), Automotive Infotainment Processors, CPU/GPU Thermal Monitoring in Embedded Systems, Industrial Automation Thermal Protection, Test and Measurement Instrumentation.
Automotive Battery Management Systems
The TMP411-Q1's AEC-Q100 qualification and ±1°C remote accuracy make it a strong fit for BMS cell and module temperature monitoring. Its remote channel senses the junction of a diode-connected transistor placed on the battery board, with measurement range up to 150°C covering thermal-runaway margins. The series-resistance correction cancels PCB trace error up to several ohms, and the open-drain THERM/ALERT outputs give the BMS controller a hardware-level over-temperature interrupt independent of the I2C polling loop, while 8 uA shutdown current preserves battery budget during standby.
Recommended
Engine Control Units (ECU)
In engine control units, the TMP411-Q1 monitors junction temperatures of the main MCU and power devices using its remote diode channel, with local sensing for the PCB ambient. The programmable N-factor register adapts to the specific automotive MCU's on-die transistor, keeping ±1°C accuracy across silicon revisions. AEC-Q100 qualification is mandatory here, and the diode fault detection output flags open or shorted sense diodes so the ECU can fall back to safe strategies rather than acting on invalid temperature data.
Recommended
Automotive Infotainment Processors
Infotainment SoCs such as Jacinto/DRAx run hot and require accurate junction monitoring for dynamic thermal management. The TMP411-Q1 reads the SoC's embedded thermal diode with up to 12-bit programmable resolution, letting the host throttle clocks before hitting thermal limits. The minimum/maximum temperature monitors simplify logging, and the two open-drain alert pins (THERM and ALERT/THERM2) can implement separate warn and trip thresholds over I2C, protecting user experience while preventing shutdown in dash-mount environments reaching +85°C ambient.
Recommended
CPU/GPU Thermal Monitoring in Embedded Systems
The TMP411-Q1 inherits the classic PC-style remote-diode monitoring role: sensing CPU, GPU, or FPGA junction temperatures over SMBus. Its register architecture follows the LM90-family convention familiar to server and embedded-BMC firmware, and the SMBus alert-response protocol enables multiple sensors to share one bus. With 8 uA shutdown current and a compact 3x3 mm VSSOP-8 footprint, it fits dense compute boards where channel count and thermal data fidelity directly govern fan control and performance scaling.
Recommended
Industrial Automation Thermal Protection
In industrial drives, PLCs, and motor-control panels, the TMP411-Q1 provides two-wire I2C temperature telemetry from IGBT/MOSFET hotspots using a diode-connected transistor mounted near the power stage. Its 2.7V-5.5V supply tolerance matches standard 3.3V/5V control rails, and fault detection distinguishes a missing sensor from a genuine over-temperature event - critical for avoiding nuisance trips. The programmable threshold and hysteresis registers let one device implement staged protection: fan speed-up, derating, and final shutdown.
Recommended
Test and Measurement Instrumentation
Bench instruments and data loggers use the TMP411-Q1 for precise thermal logging of ASICs and voltage-reference environments. The 12-bit programmable resolution yields about 0.0625°C steps, and the ±0.8°C enhanced TMP411D-Q1 variant is available for tighter applications. SMBus timeout support prevents bus lockups in long cabling scenarios, while the minimum/maximum monitor registers allow autonomous peak-capture between host polls - useful for characterizing thermal transients in power supplies and RF amplifiers.
Recommended
Recommended Products Summary
Engineering reference data for TMP411-Q1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TMP411D-Q1 | TMP411ADGKR | TMP451-Q1 | ADM1032A |
|---|---|---|---|---|---|
| Package | 8-VSSOP (DGK) | 8-VSSOP (DGK) - same | 8-VSSOP (DGK) - same | 8-VSSOP (DGS, smaller) - near | 8-MSOP - near |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Remote Accuracy | ±1°C | ±0.8°C | ±1°C | ±1°C | ±1°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 | 3.0 V to 5.5 V |
| Automotive Grade (AEC-Q100) | Yes | Yes | No | Yes | No |
| N-Factor Correction | Yes (programmable) | Yes | Yes | Yes | Pin-selectable |
| Series Resistance Cancellation | Yes | Yes | Yes | Yes | No |
| Interface | I2C/SMBus | I2C/SMBus | I2C/SMBus | I2C/SMBus | SMBus/I2C |
Key Differentiators
- Automotive AEC-Q100 qualification with dual correction features (vs TMP411ADGKR)
- Series resistance cancellation (vs ADM1032A)
- Higher accuracy variant available in same package (vs TMP451-Q1)
Design Notes
Route the D+/D- remote-sense traces as a short, tightly coupled differential pair away from switching regulators and high-current paths. The TMP411-Q1's series-resistance correction register can cancel several ohms of trace resistance, but noise coupling still causes reading jitter; place a 1000 pF (typical) differential filter capacitor across D+/D- close to the sensor, and a 100 pF to ground on each line if the environment is severe.
Configure the N-factor register to match the ideality factor of the specific external transistor (MCU/MPU/FPGA on-die diode) before trusting absolute readings - a mismatched N-factor introduces systematic error beyond the ±1°C spec. Both THERM and ALERT/THERM2 are open-drain outputs and will not assert visibly without pull-up resistors to V+; enable SMBus timeout if the bus traverses cables or long harnesses.
Decouple V+ with a 0.1 uF ceramic capacitor placed within 2 mm of the supply pin. Supply range is 2.7V to 5.5V, so 3.3V and 5V rails are both acceptable; at 5V, verify the I2C pull-up voltage and bus capacitance do not exceed SMBus limits. Shutdown mode draws approximately 8 uA - use it in always-on automotive nodes to preserve quiescent budget.
Compliance Information
AEC-Q100 qualified per TI automotive product classification (TMP411AQDGKRQ1). RoHS/lead-free per TI standard packaging; other values not stated in provided data.
