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

Please check latest availability status for a specific part variant.


The MAX4322/MAX4323/MAX4326/MAX4327/MAX4329 family of operational amplifiers combines wide bandwidth and excellent DC accuracy with rail-to-rail operation at the inputs and outputs. These devices consume only 650µA per amplifier and operate from either a single supply (2.4V to 6.5V) or dual supplies (±1.2V to ±3.25V). These unity-gain-stable amplifiers are capable of driving 250Ω loads and have a 5MHz gain-bandwidth product. The MAX4323 and MAX4327 feature a low-power shutdown mode that reduces supply current to 25µA and places the outputs in a high-impedance state.

With their rail-to-rail input common-mode range and output swing, these amplifiers are ideal for low-voltage, single-supply operation. In addition, low offset voltage and high speed make them the ideal signal-conditioning stages for precision, low-voltage data-acquisition systems.

The MAX4323 is offered in a small 6-bump chip-scale package (UCSP™). The MAX4322/MAX4323 are also available in space-saving SOT23 packages.
MAX4322, MAX4323, MAX4326, MAX4327, MAX4329: Typical Operating Circuit MAX4322, MAX4323, MAX4326, MAX4327, MAX4329: Typical Operating Circuit Enlarge+

Key Features

  • 6-Bump UCSP Package (MAX4323)
  • 2.4V to 6.5V Single-Supply Operation
  • Rail-to-rail Input Common-Mode Voltage Range
  • Rail-to-rail Output Voltage Swing
  • 5MHz Gain-Bandwidth Product
  • 650µA Quiescent Current per Amplifier
  • 700µV Offset Voltage
  • No Phase Reversal for Overdriven Inputs
  • Drive 250Ω Loads
  • 25µA Shutdown Mode (MAX4323/MAX4327)
  • Unity-Gain Stable for Capacitive Loads Up to 500pF


  • Automotive Sensors
  • Base Station/Wireless Infrastructure
  • Battery-Powered Instruments
  • Computers: Desktops, Workstations, and Servers
  • Computers: Motherboards
  • Computers: Notebook
  • Data Acquisition Systems
  • GPS Solutions
  • Low-Power, Low-Voltage Applications
  • MP3 Docking Stations: Mid Level
  • PA Biasing
  • Portable Equipment
  • Programmable Logic Controllers (PLCs)
  • RSSI Systems
  • Set-Top Boxes
  • Signal Conditioning

See parametric specs for Operational Amplifiers (177)

Part NumberAmps.Rail to RailICC per Amp.
Unity Gain BW
Slew Rate
typminmaxmaxtyptypmaxtyptyp<See Notes
MAX4322 1Input/Output7302.46.52500941001505222
SOIC (N)/8
$0.75 @1k
MAX4323 12500
SOIC (N)/8
UCSP (B)/6
$1.01 @1k
MAX4326 22500
SOIC (N)/8
$1.26 @1k
MAX4327 22000
SOIC (N)/14
$1.24 @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.
Request Reliability Report for: MAX4323 
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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Related Resources

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