SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps

Please check latest availability status for a specific part variant.


The MAX4174/MAX4175/MAX4274/MAX4275 GainAmp family combines a low-cost rail-to-rail op amp with precision internal gain-setting resistors and VCC/2 biasing. Factory-trimmed on-chip resistors decrease design size, cost, and layout, and provide 0.1% gain accuracy. Fixed inverting gains from -0.25V/V to -100V/V or noninverting gains from +1.25V/V to +101V/V are available. These devices operate from a single +2.5V to +5.5V supply and consume only 300µA. GainAmp amplifiers are optimally compensated for each gain version, achieving exceptional GBW products up to 23MHz (AV = +25V/V to +101V/V). High-voltage fault protection withstands µ17V at either input without excessive current draw.

Three versions are available in this amplifier family: single/dual/quad open-loop, unity-gain stable (MAX4281/MAX4282/MAX4284); single/dual fixed gain (MAX4174/MAX4274); and single/dual fixed gain plus internal VCC/2 bias at the noninverting input (MAX4175/MAX4275), which simplifies input biasing in single-supply designs. The input common-mode voltage range of the open-loop amplifiers extends from 150mV below the negative supply to within 1.2V of the positive supply. The outputs can swing rail-to-rail and drive a 1kΩ load while maintaining excellent DC accuracy. The amplifier is stable for capacitive loads up to 470pF.
MAX4174, MAX4175, MAX4274, MAX4275, MAX4281, MAX4282, MAX4284: Typical Operating Circuit MAX4174, MAX4175, MAX4274, MAX4275, MAX4281, MAX4282, MAX4284: Typical Operating Circuit Enlarge+

Key Features

  • GainAmp Family Provides Internal Precision Gain-Setting Resistors in SOT23 (MAX4174/5)
  • 0.1% Gain Accuracy (RF/RG) (MAX4174/5, MAX4274/5)
  • 54 Standard Gains Available (MAX4174/5, MAX4274/5)
  • Open-Loop Unity-Gain-Stable Op Amps (MAX4281/2/4)
  • Rail-to-Rail Outputs Drive 1kΩ Load
  • Internal VCC/2 Biasing (MAX4175/MAX4275)
  • +2.5V to +5.5V Single Supply
  • 300µA Supply Current
  • Up to 23MHz GBW Product
  • Fault-Protected Inputs Withstand ±17V
  • Stable with Capacitive Loads Up to 470pF with No Isolation Resistor


  • Cellular Handsets
  • Digital Cameras (DIGICAMs)
  • Glucose Meters
  • GPS Solutions
  • Infrared Receivers for Remote Controls
  • Instruments, Terminals, and Bar-Code Readers
  • IP Camera
  • Keyless Entry
  • Low-Side Current-Sense Amplifiers
  • MP3 and Portable Media Players
  • Photodiode Preamps
  • Portable Instruments
  • Smart-Card Readers

Technical Documents

App Note 700 Fixed-Gain Op Amps Simplify Filter Design
Request Reliability Report for: MAX4175 
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.

Quality Management System >
Environmental Management System >


Related Resources

High-Speed Quad Driver with Integrated DACs, Cable-Droop Compensation, Slew-Rate Control, and VHH Fourth-Level Drive

  • Low Power at High-Speed Maximizes Driver Performance
    • 700mW per Channel
    • 2.57Gbps at +1V Programmed
    • 280ps Typical Rise/Fall Times at +2V (20% to 80%)
  • Integrated Functionality Provides Value-Added Features
    • Programmable Double Time Constant Cable-Droop Compensation
    • Digital Slew-Rate Control for EMI Sensitive Applications
    • Adjustable Output Resistance with 360mΩ Resolution

  • MAX40662
    Quad Transimpedance Amplifier with Input Current Clamp and Multiplexer for LiDAR

    • AEC-Q100
    • Enables ASIL Compliance (FMEDA Available Upon Request)
    • Internal Multiplexer

    Dual 280ps High-Speed Comparator, Ultra-Low Dispersion with LVDS Outputs

    • Fast Propagation Delay: 280ps, Typ
    • Low Overdrive Dispersion: 25ps (VOD = 10mV to 1V)
    • Supply Voltage 2.7V to 3.6V