UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps

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The MAX4249–MAX4257 low-noise, low-distortion operational amplifiers offer rail-to-rail outputs and single-supply operation down to 2.4V. They draw 400µA of quiescent supply current per amplifier while featuring ultra-low distortion (0.0002% THD), as well as low input voltage-noise density (7.9nV/) and low input current-noise density (0.5fA/). These features make the devices an ideal choice for portable/battery-powered applications that require low distortion and/or low noise.

For additional power conservation, the MAX4249/MAX4251/MAX4253/MAX4256 offer a low-power shutdown mode that reduces supply current to 0.5µA and puts the amplifiers' outputs into a high-impedance state. The MAX4249–MAX4257's outputs swing rail-to-rail and their input common-mode voltage range includes ground. The MAX4250–MAX4254 are unity-gain stable with a gain-bandwidth product of 3MHz. The MAX4249/MAX4255/MAX4256/MAX4257 are internally compensated for gains of 10V/V or greater with a gain-bandwidth product of 22MHz. The single MAX4250/MAX4255 are available in space-saving 5-pin SOT23 packages. The MAX4252 is available in an 8-bump chip-scale package (UCSP) and the MAX4253 is available in a 10-bump UCSP. The MAX4250AAUK comes in a 5-pin SOT23 package and is specified for operation over the automotive (-40°C to +125°C) temperature range.
MAX4249, MAX4250, MAX4251, MAX4252, MAX4253, MAX4254, MAX4255, MAX4256, MAX4257: Typical Operating Circuit MAX4249, MAX4250, MAX4251, MAX4252, MAX4253, MAX4254, MAX4255, MAX4256, MAX4257: Typical Operating Circuit Enlarge+

Key Features

  • Available in Space-Saving UCSP, SOT23, and µMAX® Packages
  • Low Distortion: 0.0002% THD (1kΩ load)
  • 400µA Quiescent Supply Current per Amplifier
  • Single-Supply Operation from 2.4V to 5.5V
  • Input Common-Mode Voltage Range Includes Ground
  • Outputs Swing Within 8mV of Rails with a 10kΩ Load
  • 3MHz GBW Product, Unity-Gain Stable (MAX4250-MAX4254)
  • 22MHz GBW Product, Stable with AV ≥ 10V/V (MAX4249/MAX4255/MAX4256/MAX4257)
  • Excellent DC Characteristics
    • VOS = 70µV
    • IBIAS = 1pA
    • Large-Signal Voltage Gain = 116dB
  • Low-Power Shutdown Mode
    • Reduces Supply Current to 0.5µA
    • Places Outputs in a High-Impedance State
  • 400pF Capacitive-Load Handling Capability


  • ADC Buffers
  • Automatic Test Equipment (ATE)
  • Cardiac Monitor
  • Digital Scales/Strain Gauges
  • Displays: Industrial, Front Panel, and Instrumentation
  • Industrial: Process Measurement and Control
  • Medical Instrumentation
  • PA Control
  • Panel Meters
  • Portable Battery-Powered Equipment
  • Power Meters
  • Programmable Logic Controllers (PLCs)
  • Wireless Communications Devices

See parametric specs for Operational Amplifiers (177)

Part NumberAmps.Rail to RailICC per Amp.
Low Input Bias CMOS InputsInput IBIAS
Unity Gain BW
Slew Rate
typminmaxmaxtyptypmaxtyptyp<See Notes
MAX4249 2Output Only4202.45.5750115100Yes0.1222.18.9
SOIC (N)/14
$1.33 @1k
MAX4250 130.3
$1.36 @1k
MAX4251 130.3
SOIC (N)/8
$1.22 @1k
MAX4252 230.3
SOIC (N)/8
UCSP (B)/9
$1.00 @1k
MAX4253 230.3
SOIC (N)/14
UCSP (B)/12
$1.72 @1k
MAX4255 1222.1
$0.91 @1k
MAX4256 1222.1
SOIC (N)/8
$0.87 @1k
MAX4257 2222.1
SOIC (N)/8
$1.21 @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: MAX4256 
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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