Single/Dual/Quad, Low-Cost, SOT23, Micropower Rail-to-Rail I/O Op Amps

Please check latest availability status for a specific part variant.


The MAX4040–MAX4044 family of micropower op amps operates from a single +2.4V to +5.5V supply or dual ±1.2V to ±2.75V supplies and have rail-to-rail input and output capabilities. These amplifiers provide a 90kHz gain-bandwidth product while using only 10µA of supply current per amplifier. The MAX4041/MAX4043 have a low-power shutdown mode that reduces supply current to less than 1µA and forces the output into a high-impedance state. The combination of low-voltage operation, rail-to-rail inputs and outputs, and ultra-low power consumption makes these devices ideal for any portable/battery-powered system.

These amplifiers have outputs that typically swing to within 10mV of the rails with a 100kΩ load. Rail-to-rail input and output characteristics allow the full power-supply voltage to be used for signal range. The combination of low input offset voltage, low input bias current, and high open-loop gain makes them suitable for low-power/ low-voltage precision applications.

The MAX4040 is offered in a space-saving 5-pin SOT23 package. All specifications are guaranteed over the -40°C to +85°C extended temperature range.
MAX4040, MAX4041, MAX4042, MAX4043, MAX4044: Pin Configurations MAX4040, MAX4041, MAX4042, MAX4043, MAX4044: Pin Configurations Enlarge+

Key Features

  • Single-Supply Operation Down to +2.4V
  • Ultra-Low Power Consumption:
    • 10µA Supply Current per Amplifier
    • 1µA Shutdown Mode (MAX4041/MAX4043)
  • Rail-to-Rail Input Common-Mode Range
  • Outputs Swing Rail-to-Rail
  • No Phase Reversal for Overdriven Inputs
  • 200µV Input Offset Voltage
  • Unity-Gain Stable for Capacitive Loads up to 200pF
  • 90kHz Gain-Bandwidth Product
  • Available in Space-Saving 5-Pin SOT23 and 8-Pin µMAX® Packages


  • Battery Powered Systems
  • Cellular Handsets
  • Cellular Phones
  • Digital Cameras (DIGICAMs)
  • Digital Scales
  • GPS Solutions
  • MP3 and Portable Media Players
  • Notebook Computers
  • PDAs
  • Portable/Battery-Powered Electronic Equipment
  • Sensor Amplifiers
  • Strain Gauges
Part NumberAmps.Rail to RailVSUPPLY (Total)
ICC per Amp.
Unity Gain BW
Slew Rate
minmaxtypmaxtyptypmaxtyptyp<See Notes
MAX4040 1Input/Output2.45.51215009485100.090.0470
SOIC (N)/8
$0.86 @1k
MAX4041 1
SOIC (N)/8
$1.01 @1k
MAX4042 2
SOIC (N)/8
$1.19 @1k
MAX4043 2
SOIC (N)/14
$1.27 @500
See All Operational Amplifiers (174)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 1873 Using a 4–20mA Loop-Powered Temperature Sensor
App Note 1862 Circuit Drives Mixed Types and Quantities of LEDs

Quality and Environmental Data

Product Reliability Reports: MAX4040.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >


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