Product details

Local sensor accuracy (max) 1.5 Type Remote Operating temperature range (°C) -40 to 125 Supply voltage (min) (V) 2.7 Interface type I2C, SMBus Supply voltage (max) (V) 5.5 Features One-shot conversion Supply current (max) (µA) 38 Temp resolution (max) (bps) 12 Remote channels (#) 1 Addresses 9 Rating Automotive
Local sensor accuracy (max) 1.5 Type Remote Operating temperature range (°C) -40 to 125 Supply voltage (min) (V) 2.7 Interface type I2C, SMBus Supply voltage (max) (V) 5.5 Features One-shot conversion Supply current (max) (µA) 38 Temp resolution (max) (bps) 12 Remote channels (#) 1 Addresses 9 Rating Automotive
SOT-23 (DCN) 8 4.64 mm² 2.9 x 1.6
  • AEC-Q100 Qualified with the Following Results
    • Temperature Grade 1: –40°C to +125°C
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C5
  • SOT23-8 Package
  • ±1°C Remote Diode Sensor (Maximum)
  • ±1.5°C Local Temperature Sensor (Maximum)
  • Series Resistance Cancellation
  • n-Factor Correction
  • Two-Wire I2C or SMBus™ Compatible Serial Interface
  • Multiple Interface Addresses
  • Diode Fault Detection
  • RoHS Compliant and No Sb/Br
  • AEC-Q100 Qualified with the Following Results
    • Temperature Grade 1: –40°C to +125°C
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C5
  • SOT23-8 Package
  • ±1°C Remote Diode Sensor (Maximum)
  • ±1.5°C Local Temperature Sensor (Maximum)
  • Series Resistance Cancellation
  • n-Factor Correction
  • Two-Wire I2C or SMBus™ Compatible Serial Interface
  • Multiple Interface Addresses
  • Diode Fault Detection
  • RoHS Compliant and No Sb/Br

The TMP421-Q1, TMP422-Q1, and TMP423-Q1 devices are single, dual, and triple remote, automotive-qualified temperature sensor monitors with a built-in local temperature sensor. The remote temperature sensor diode-connected transistors are typically low-cost, NPN- or PNP-type transistors or diodes that are an integral part of microcontrollers, microprocessors, or field-programmable gate arrays (FPGAs).

Remote accuracy is ±1°C for multiple device manufacturers, with no calibration needed. The two-wire serial interface accepts SMBus write byte, read byte, send byte, and receive byte commands to configure the device.

The TMP421-Q1, TMP422-Q1, and TMP423-Q1 include series resistance cancellation, programmable non-ideality factor, wide remote temperature measurement range (up to +150°C), and diode fault detection.

The TMP421-Q1, TMP422-Q1, and TMP423-Q1 are all available in an 8-pin SOT-23 package.

The TMP421-Q1, TMP422-Q1, and TMP423-Q1 devices are single, dual, and triple remote, automotive-qualified temperature sensor monitors with a built-in local temperature sensor. The remote temperature sensor diode-connected transistors are typically low-cost, NPN- or PNP-type transistors or diodes that are an integral part of microcontrollers, microprocessors, or field-programmable gate arrays (FPGAs).

Remote accuracy is ±1°C for multiple device manufacturers, with no calibration needed. The two-wire serial interface accepts SMBus write byte, read byte, send byte, and receive byte commands to configure the device.

The TMP421-Q1, TMP422-Q1, and TMP423-Q1 include series resistance cancellation, programmable non-ideality factor, wide remote temperature measurement range (up to +150°C), and diode fault detection.

The TMP421-Q1, TMP422-Q1, and TMP423-Q1 are all available in an 8-pin SOT-23 package.

Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Pin-for-pin with same functionality to the compared device
TMP422-Q1 ACTIVE AEC-Q100 Automotive 2Ch Remote Temperature Sensor 1 local channel and 2 remote channels alternative in a SOT23-8 package

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 3
Type Title Date
* Data sheet TMP42x-Q1 ±1°C Remote and Local Temperature Sensor datasheet PDF | HTML 29 Nov 2016
Application note Meeting ASIL Requirements for LIDAR Systems Using Remote Temperature Sensors PDF | HTML 16 Nov 2021
Technical article How to maximize powertrain efficiency and reliability with high-accuracy temperatu PDF | HTML 10 May 2021

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Driver or library

TMP421SW-LINUX — Linux Driver for TMP421

The Linux driver supports the TMP421 series of Remote and Local Temp Sensors. The Linux driver supports communication through the I2C bus and interfaces with the Hardware Monitoring sub-system.
Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

Supported Devices:
  • (...)
Package Pins CAD symbols, footprints & 3D models
SOT-23 (DCN) 8 Ultra Librarian

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos