3V/5V Low-Power, Low Input-Bias, CMOS, Rail-to-Rail I/O Op Amps

Delivers Low-Power, Cost-Effective Solutions Where Low Noise and Low IBIAS Are Critical

Please check latest availability status for a specific part variant.


The MAX9636/MAX9637/MAX9638 are single-supply, CMOS input op amps featuring wide bandwidth at low quiescent current, making them suitable for a broad range of battery-powered applications such as portable medical instruments, portable media players, and smoke detectors. A combination of extremely low input bias currents, low input current noise and low input voltage noise allows interface to high-impedance sources such as photodiode and piezoelectric sensors.

The ICs feature a maximized ratio of gain bandwidth (GBW) to supply current. The devices operate from a single 2.1V to 5.5V supply at a typical quiescent supply current of 36µA. For additional power conservation, the MAX9636 and MAX9638 offer a low-power shutdown mode that reduces supply current to 1µA and places the amplifiers' outputs into a high-impedance state.

The ICs are specified over the automotive operating temperature range (-40°C to +125°C). The single is offered in a space-saving, 6-pin SC70 package, while the dual is offered in tiny, 8-pin SC70 and 10-pin UTQFN packages.
MAX9636, MAX9637, MAX9638: Block Diagram MAX9636, MAX9637, MAX9638: Block Diagram Enlarge+

Key Features

  • Ideal for Precision Transimpedance Amplifier Applications
    • Ultra-Low 0.1pA Bias Current
    • Wide 1.5MHz Bandwidth
    • Low Input Current-Noise Density: 0.9fA/√Hz
  • Extend Battery Life
    • Single-Supply Operation VDD = 2.1V to 5.5V
    • Low 36µA Quiescent Current
    • 1µA Quiescent Current in Shutdown
  • Save Board Space
    • 6- and 8-Pin SC70 and 10-Pin UTQFN Packages


  • Battery-Powered Devices
  • Piezoelectric Transducer Amplifiers
  • Portable Medical Instruments
  • Smoke Detectors
  • Tablets
  • Transimpedance Amplifiers

See parametric specs for Operational Amplifiers (175)

Part NumberAmps.Rail to RailICC per Amp.
Low Input Bias CMOS InputsInput IBIAS
Unity Gain BW
Slew Rate
typminmaxmaxtyptypmaxtyptyp<See Notes
MAX9636 1Input/Output362.15.5220086100Yes0.00081.50.938
$0.45 @1k
MAX9637 2
$0.77 @1k
MAX9638 2
$0.77 @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.

MAX9636EVKIT: Evaluation Kit for the MAX9636
MAX9638EVKIT: Evaluation Kit for the MAX9638

Tools & Models

  • MAX9636 Orcad Library
  • Product Reliability Reports: MAX9636.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.

    Quality Management System >
    Environmental Management System >


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