Low-power, general-purpose operational amplifier

The LMX3xx series is a set of single, dual, and quad low-voltage, general-purpose, operational amplifiers. These devices can operate from 2.3 V to 5.5 V with a typical current consumption of 120 μA per channel. The LMX3xx series offers a rail-to-rail output and an input common-mode voltage that includes ground.

The LMX3xx series also exhibits a 1.3 MHz gain bandwidth and they can drive capacitive loads. The devices are stable while operating at unity gain. They are offered with industry standard pinouts in tiny packages.

Key Features

  • Low power consumption: 120 μA at 2.7 V
  • Low supply voltage: 2.3 V - 5.5 V
  • Rail-to-rail output swing
  • Gain bandwidth product: 1.3 MHz
  • Extended temperature range: -40 °C to 125 °C
  • No crossover distortion
  • No phase reversal
  • Tiny packages
  • Related products
    • See the TSV85x series for higher accuracy, stand-by options, and smaller packages


Technical Documentation

Product Specifications
Description Version Size
DS8954 DS8954: General-purpose, low voltage rail-to-rail output operational amplifiers 3.0 1 MB
Technical Notes & Articles
Description Version Size
How to Extend the Performance of a Low Voltage Precision Op Amp to a High Voltage High Side Current Sensing Application 1.0 473 KB
User Manuals
Description Version Size
Design Notes & Tips
Description Version Size
DT0073 DT0073: Optical heart rate monitoring – OHRM based on X-NUCLEO-IKA01A1 expansion board 1.0 1 MB

HW Model, CAD Libraries & SVD

HW Model, CAD Libraries & SVD
Description Version Size
LMX321-LMX358-LMX324 Pspice model 1.0 2 KB
ST library for all op amps and comparators SPICE models 4.0 51 KB

Presentations & Training Material

Description Version Size
Health and Wellness Mobility Cloud computing 1 MB
ST offering in Wearable - Analog and Mixed Signal Portfolio 3.0 1 MB
VMA automotive applications 1 MB
What does precision mean for an op amp? 1 MB

Publications and Collaterals

Selection Guides
Description Version Size
ST Analog cards High-performance operational amplifiers and comparators, the best choice for longevity, robustness and performance. 1.0 818 KB
Description Version Size
Operational amplifiers: performance, robust and advanced technology 2 MB
Products and Solutions for Factory Automation and Control 1.0 3 MB
Support & Community

Sample & Buy

Part Number Package Packing Type Operating Temperature (°C) (min) Operating Temperature (°C) (max) Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
LMX321ILT SOT23-5L Tape And Reel -40 125 Active 0.214 1000 NEC EAR99 MALAYSIA MORE INFO No availability reported, please contact our Sales office
LMX321ICT SC70-5 Tape And Reel -40 125 Active 0.214 1000 NEC EAR99 MALAYSIA MORE INFO No availability reported, please contact our Sales office

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
LMX321ILT ActiveSOT23-5LIndustrialEcopack3 0 0
LMX321ICT ActiveSC70-5IndustrialEcopack3

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.