Ultra-Small, +1.8V, µPower, Rail-to-Rail I/O Op Amps

1.8V Op Amps Deliver 120dB Avol and Drive 2-kilohm loads with 0.017% THD+N

Please check latest availability status for a specific part variant.


The MAX4291/MAX4292/MAX4294 family of micropower operational amplifiers operates from a 1.8V to 5.5V single supply or ±0.9V to ±2.75V dual supplies and has Rail-to-Rail input/output capabilities. These amplifiers provide a 500kHz gain-bandwidth product and 120dB open-loop voltage gain while using only 100µA of supply current per amplifier. The combination of low input offset voltage (±200µV) and high open-loop gain makes them ideal for low-power/low-voltage, high-precision portable applications.

The MAX4291/MAX4292/MAX4294 have an input common-mode range that extends to each supply rail, and their outputs swing to within 46mV of the rails with a 2kΩ load. 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, rail-to-rail inputs/output, and low-power consumption makes these devices ideal for any portable/two-cell battery-powered system.

The single MAX4291 is offered in an ultra-small 5-pin SC70 package. The dual MAX4292 is offered in a space-saving 8-bump, 1.5mm x 1.5mm footprint, ultra chip-scale package (UCSP™).
MAX4291, MAX4292, MAX4294: Pin Configurations MAX4291, MAX4292, MAX4294: Pin Configurations Enlarge+

Key Features

  • Ultra-Low Voltage Operation—Guaranteed Down to 1.8V
  • 100µA Supply Current per Amplifier
  • 500kHz Gain-Bandwidth Product
  • 120dB Open-Loop Voltage Gain (RL = 100kΩ)
  • 0.017% Total Harmonic Distortion Plus Noise (THD + N) at 1kHz
  • Rail-to-Rail Input Common-Mode Range
  • Rail-to-Rail Output Drives 2kΩ Load
  • No Phase Reversal for Overdriven Inputs
  • Unity-Gain Stable for Capacitive Loads up to 100pF
  • 200µV Input Offset Voltage (MAX4292/MAX4294)
  • Single in Small 5-Pin SC70
  • Available in Ultra-Small Packages:
    • 5-Pin SC70 (MAX4291)
    • 8-Bump UCSP (MAX4292)


  • 2-Cell Battery-Operated Systems
  • Automotive Sensors
  • Base Station/Wireless Infrastructure
  • Battery-Powered Applications
  • Cell Phones
  • Computers: Desktops, Workstations, and Servers
  • Computers: Motherboards
  • Computers: Notebook
  • Digital Scales/Strain Gauges
  • GPS Solutions
  • MP3 Docking Stations: Mid Level
  • Portable Electronic Equipment
  • Programmable Logic Controllers (PLCs)
  • Sensor Amplifiers
  • Set-Top Boxes
  • Strain Gauges

See parametric specs for Operational Amplifiers (175)

Part NumberAmps.Rail to RailICC per Amp.
Unity Gain BW
Slew Rate
typminmaxmaxtyptypmaxtyptyp<See Notes
MAX4291 1Input/Output1001.85.5250090100550.50.270
$0.70 @1k
MAX4292 2
SOIC (N)/8
UCSP (B)/9
$1.61 @1k
MAX4294 4
SOIC (N)/14
$2.31 @1k

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.
Product Reliability Reports: MAX4292.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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