MAX4240:Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps

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.

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
MAX4240, MAX4241, MAX4242, MAX4243, MAX4244: Pin Configurations
MAX4240, MAX4241, MAX4242, MAX4243, MAX4244: Pin Configurations
  • 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
titleDownload file
MAX4240-MAX4244 Data SheetMAX4240-MAX4244.pdf
Part NumberAmps.Rail to RailVSUPPLY (Total)
ICC per Amp.
Unity Gain BW
Slew Rate
minmaxtypmaxtyptypmaxtyptyp<See Notes
MAX42401Input/Output1.85.5141400948560.090.0470SOT/5$1.54 @1k
$1.40 @1k
$2.00 @1k
$2.13 @1k
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX4240EUK+ActiveSOT,;5 pin;9 mm²-40°C to +85°CLead Free
MAX4240EUK+TActiveSOT,;5 pin;9 mm²-40°C to +85°CLead Free
MAX4240EUK-TNo Longer AvailableMAX4240EUK+TSOT,;5 pin;9 mm²-40°C to +85°CNo
MAX4240-MAX4244.pdf MAX4243
Rail-to-Rail Outputs and Beyond-the-Rails Inputs: The Inside Story on Micropower Op Amps MAX492
MAX4240-MAX4244.pdf MAX4244