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TMP421

ACTIVE

Remote and Local Temperature Sensor with N-Factor and Series-R Correction in WCSP

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Data sheet

TMP421

ACTIVE
Data sheet Order now

Product details

Local sensor accuracy (max) 2.5 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 Catalog
Local sensor accuracy (max) 2.5 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 Catalog
DSBGA (YZD) 8 2.972025 mm² 2.295 x 1.295 SOT-23 (DCN) 8 4.64 mm² 2.9 x 1.6
  • SOT23-8 and DSBGA (WCSP) PACKAGES
  • ±1°C REMOTE DIODE SENSOR (MAX)
  • ±1.5°C LOCAL TEMPERATURE SENSOR (MAX)
  • SERIES RESISTANCE CANCELLATION
  • n-FACTOR CORRECTION
  • TWO-WIRE/SMBus™ SERIAL INTERFACE
  • MULTIPLE INTERFACE ADDRESSES
  • DIODE FAULT DETECTION
  • RoHS COMPLIANT AND NO Sb/Br
  • SOT23-8 and DSBGA (WCSP) PACKAGES
  • ±1°C REMOTE DIODE SENSOR (MAX)
  • ±1.5°C LOCAL TEMPERATURE SENSOR (MAX)
  • SERIES RESISTANCE CANCELLATION
  • n-FACTOR CORRECTION
  • TWO-WIRE/SMBus™ SERIAL INTERFACE
  • MULTIPLE INTERFACE ADDRESSES
  • DIODE FAULT DETECTION
  • RoHS COMPLIANT AND NO Sb/Br

The TMP421, TMP422, and TMP423 are remote 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 FPGAs.

Remote accuracy is ±1°C for multiple IC 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, TMP422, and TMP423 include series resistance cancellation, programmable non-ideality factor, wide remote temperature measurement range (up to +150°C), and diode fault detection.

The TMP421, TMP422, and TMP423 are all available in a SOT23-8 package. The TMP421C is also available in a DSBGA (WCSP) package.

The TMP421, TMP422, and TMP423 are remote 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 FPGAs.

Remote accuracy is ±1°C for multiple IC 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, TMP422, and TMP423 include series resistance cancellation, programmable non-ideality factor, wide remote temperature measurement range (up to +150°C), and diode fault detection.

The TMP421, TMP422, and TMP423 are all available in a SOT23-8 package. The TMP421C is also available in a DSBGA (WCSP) package.
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TMP422 ACTIVE Dual Remote and Local Temperature Sensor with N-Factor and Series-R Correction in WCSP 1 local channel and 2 remote channels alternative in a SOT23-8 package

Technical documentation

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* Data sheet ±1°C Remote and Local Temperature Sensor datasheet (Rev. C) 07 May 2012
Application note How to Read and Interpret Digital Temperature Sensor Output Data PDF | HTML 12 Apr 2024

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:
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Simulation model

TMP4xx Family IBIS Model (Rev. A)

SBOM410A.ZIP (60 KB) - IBIS Model
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Calculation tool

SBOC594 — Remote Temperature Sensor Calibration Tool

Supported products & hardware

Supported products & hardware

Products
Digital temperature sensors
TMP400 — Remote and Local Temperature Sensor with N-Factor and Series-R Correction in QSSOP-16 TMP411 — Remote and local temperature sensor with N-factor and series resistance correction TMP421 — Remote and Local Temperature Sensor with N-Factor and Series-R Correction in WCSP TMP422 — Dual Remote and Local Temperature Sensor with N-Factor and Series-R Correction in WCSP TMP423 — Triple Remote and Local Temperature Sensor with N-Factor and Series-R Correction TMP431 — Remote and Local Temperature Sensor with Automatic Beta, N-Factor and Series-R Correction TMP432 — Dual Remote and Local Temp Sensor with Automatic Beta, N-Factor and Series-R Correction TMP441 — Multi-Address Remote and Local Temp Sensor with Auto Beta, N-Factor and Series-R Correction in SOT23 TMP451 — 1.7-V remote and local temperature sensor with N-factor, filtering and series-R correction TMP461 — High accuracy remote and local temperature sensor with pin-programmable bus address TMP464 — 5-Channel (4-Remote and 1-Local) High-Accuracy Remote and Local Temperature Sensor TMP468 — ±0.75⁰C High-Accuracy Multi-channel Remote and Local Temperature Sensor
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Package Pins CAD symbols, footprints & 3D models
DSBGA (YZD) 8 Ultra Librarian
SOT-23 (DCN) 8 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Information included:
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  • 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

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