Product details

Local sensor accuracy (max) 1.5 Operating temperature range (°C) -50 to 150 Supply voltage (min) (V) 1.5 Supply voltage (max) (V) 5.5 Supply current (max) (µA) 12 Interface type Analog output Sensor gain (mV/°C) -13.6, -10.9, -8.2, -5.5 Rating Catalog Features UL recognized
Local sensor accuracy (max) 1.5 Operating temperature range (°C) -50 to 150 Supply voltage (min) (V) 1.5 Supply voltage (max) (V) 5.5 Supply current (max) (µA) 12 Interface type Analog output Sensor gain (mV/°C) -13.6, -10.9, -8.2, -5.5 Rating Catalog Features UL recognized
SOT-SC70 (DCK) 5 4.2 mm² 2 x 2.1
  • LM94021Q is AEC-Q100 Grade 0 Qualified
    and is Manufactured on an Automotive Grade Flow
  • Low 1.5V Operation
  • Four Selectable Gains
  • Very Accurate Over Wide Temperature Range of
    −50°C to +150°C
  • Low Quiescent Current
  • Output is Short-Circuit Protected
  • Extremely Small SC70 Package
  • Footprint Compatible with the Industry-Standard
    LM20 Temperature Sensor
  • UL Recognized Component
  • LM94021Q is AEC-Q100 Grade 0 Qualified
    and is Manufactured on an Automotive Grade Flow
  • Low 1.5V Operation
  • Four Selectable Gains
  • Very Accurate Over Wide Temperature Range of
    −50°C to +150°C
  • Low Quiescent Current
  • Output is Short-Circuit Protected
  • Extremely Small SC70 Package
  • Footprint Compatible with the Industry-Standard
    LM20 Temperature Sensor
  • UL Recognized Component

The LM94021 is a precision analog output CMOS integrated-circuit temperature sensor that operates at a supply voltage as low as 1.5V. While operating over the wide temperature range of −50°C to +150°C, the LM94021 delivers an output voltage that is inversely proportional to measured temperature. The LM94021's low supply current makes it ideal for battery-powered systems as well as general temperature sensing applications.

Two logic inputs, Gain Select 1 (GS1) and Gain Select 0 (GS0), select the gain of the temperature-to-voltage output transfer function. Four slopes are selectable: −5.5 mV/°C, −8.2 mV/°C, −10.9 mV/°C, and −13.6 mV/°C. In the lowest gain configuration (GS1 and GS0 both tied low), the LM94021 can operate with a 1.5V supply while measuring temperature over the full −50°C to +150°C operating range. Tying both inputs high causes the transfer function to have the largest gain of −13.6 mV/°C for maximum temperature sensitivity. The gain-select inputs can be tied directly to VDD or Ground without any pull-up or pull-down resistors, reducing component count and board area. These inputs can also be driven by logic signals allowing the system to optimize the gain during operation or system diagnostics.

The LM94021 is a precision analog output CMOS integrated-circuit temperature sensor that operates at a supply voltage as low as 1.5V. While operating over the wide temperature range of −50°C to +150°C, the LM94021 delivers an output voltage that is inversely proportional to measured temperature. The LM94021's low supply current makes it ideal for battery-powered systems as well as general temperature sensing applications.

Two logic inputs, Gain Select 1 (GS1) and Gain Select 0 (GS0), select the gain of the temperature-to-voltage output transfer function. Four slopes are selectable: −5.5 mV/°C, −8.2 mV/°C, −10.9 mV/°C, and −13.6 mV/°C. In the lowest gain configuration (GS1 and GS0 both tied low), the LM94021 can operate with a 1.5V supply while measuring temperature over the full −50°C to +150°C operating range. Tying both inputs high causes the transfer function to have the largest gain of −13.6 mV/°C for maximum temperature sensitivity. The gain-select inputs can be tied directly to VDD or Ground without any pull-up or pull-down resistors, reducing component count and board area. These inputs can also be driven by logic signals allowing the system to optimize the gain during operation or system diagnostics.

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Technical documentation

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Type Title Date
* Data sheet LM94021/LM94021Q Multi-Gain Analog Temperature Sensor datasheet (Rev. E) 28 Jun 2013
Certificate UL Certification 20141125-E232195 Vol 1 Sec 7 17 Nov 2023
Certificate UL Certificate of Compliance Vol1-Sec7 E232195 06 Aug 2018
EVM User's guide LM9402xEVM User's Guide 12 Sep 2013
Design guide LM94021 LM94022 LM94023 Design Aid (Rev. A) 26 Jan 2012
White paper Temperature sensor solutions for low-voltage systems 11 May 2005

Design & development

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

Evaluation board

LM9402XEVM — Evaluation Module for Multi-Gain Analog Temperature Sensor

The Texas Instruments LM9402xEVM evaluation module helps designers evaluate the operation and performance of the LM94021, LM94022, and LM94023 analog temperature sensors.

User guide: PDF
Not available on TI.com
Calculation tool

LM94021-2QUICK-CALC — LM94021 and LM94022 Voltage-to-Temperature Transfer Function Table

Calculation tool

LM9403X-DESIGNAID-CALC — LM94021 LM94022 LM94023 Design Aid

Package Pins CAD symbols, footprints & 3D models
SOT-SC70 (DCK) 5 Ultra Librarian

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Information included:
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