MAX9638:3V/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

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.

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
MAX9636, MAX9637, MAX9638: Block Diagram
MAX9636, MAX9637, MAX9638: Block Diagram
  • Battery-Powered Devices
  • Piezoelectric Transducer Amplifiers
  • Portable Medical Instruments
  • Smoke Detectors
  • Tablets
  • Transimpedance Amplifiers
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MAX9636-MAX9638 Data SheetMAX9636-MAX9638.pdf
Part NumberAmps.Rail to RailVSUPPLY (Total)
ICC per Amp.
Low Input Bias CMOS InputsInput IBIAS
Unity Gain BW
Slew Rate
minmaxtypmaxtyptypmaxtyptyp<See Notes
MAX96361Input/Output2.15.536220086100Yes0.00081.50.938SC-70/6$0.43 @1k
MAX96372SC-70/8$0.73 @1k
MAX96382UTQFN/10$0.73 @1k
Design kits & evaluation modules
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX9638AVB+ActiveUTQFN,;10 pin;2.5 mm²-40°C to +125°CLead Free
MAX9638AVB+TActiveUTQFN,;10 pin;2.5 mm²-40°C to +125°CLead Free
MAX9636-MAX9638.pdf MAX9638
MAX9638.pdf MAX9638
MAX9636-MAX9638.pdf MAX9638