Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps

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The MAX4240–MAX4244 family of micropower op amps operate from a single +1.8V to +5.5V supply or dual ±0.9V to ±2.75V supplies and have Beyond-the-Rails™ inputs and rail-to-rail output capabilities. These amplifiers provide a 90kHz gain-bandwidth product while using only 10µA of supply current per amplifier. The MAX4241/MAX4243 have a low-power shutdown mode that reduces supply current to less than 1µA and forces the output into a high-impedance state. Although the minimum operating voltage is specified at +1.8V, these devices typically operate down to +1.5V. The combination of ultra-low-voltage operation, Beyond-the-Rails inputs, rail-to-rail outputs, and ultra-low power consumption makes these devices ideal for any portable/two-cell battery-powered system.

These amplifiers have an input common-mode range that extends 200mV beyond each rail, and their outputs typically swing to within 9mV of the rails with a 100kΩ load. Beyond-the-Rails input and rail-to-rail 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 MAX4240 is offered in a space-saving 5-pin SOT23 package. All specifications are guaranteed over the -40°C to +85°C extended temperature range.
MAX4240, MAX4241, MAX4242, MAX4243, MAX4244: Pin Configurations MAX4240, MAX4241, MAX4242, MAX4243, MAX4244: Pin Configurations Enlarge+

Key Features

  • Ultra-Low-Voltage Operation:
    • Guaranteed Down to +1.8V
    • Typical Operation to +1.5V
  • Ultra-Low Power Consumption:
    • 10µA Supply Current per Amplifier
    • 1µA Shutdown Mode (MAX4241/MAX4243)
    • Up to 200,000 Hours Operation from Two AA Alkaline Cells
  • Beyond-the-Rails 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


  • 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
  • Two-Cell Battery Powered Systems
Part NumberAmps.Rail to RailVSUPPLY (Total)
ICC per Amp.
Unity Gain BW
Slew Rate
minmaxtypmaxtyptypmaxtyptyp<See Notes
MAX4240 1Input/Output1.85.5141400948560.090.0470
$1.62 @1k
MAX4241 1750
SOIC (N)/8
$1.47 @1k
MAX4242 2880
SOIC (N)/8
$2.10 @1k
MAX4243 2880
SOIC (N)/14
$2.24 @1k
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.

Quality and Environmental Data

Request Reliability Report for: MAX4241 
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.

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