Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown

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The MAX4465–MAX4469 are micropower op amps optimized for use as microphone preamplifiers. They provide the ideal combination of an optimized gain bandwidth product vs. supply current, and low-voltage operation in an ultra-small package. The MAX4465/MAX4467/MAX4469 are unity-gain stable and deliver a 200kHz gain bandwidth from only 24µA of supply current. The MAX4466/MAX4468 are decompensated for a minimum stable gain of +5V/V and provide a 600kHz gain bandwidth product. In addition these amplifiers feature rail-to-rail outputs, high AVOL, plus excellent power-supply rejection and common-mode rejection ratios for operation in noisy environments.

The MAX4467/MAX4468 include a complete shutdown mode. In shutdown, the amplifiers' supply current is reduced to 5nA and the bias current to the external microphone is cut off for ultimate power savings. The single MAX4465/MAX4466 are offered in the ultra-small 5-pin SC70 package, while the single with shutdown MAX4467/MAX4468 and dual MAX4469 are available in the space-saving 8-pin SOT23 package.
MAX4465, MAX4466, MAX4467, MAX4468, MAX4469: Typical Operating Circuit MAX4465, MAX4466, MAX4467, MAX4468, MAX4469: Typical Operating Circuit Enlarge+

Key Features

  • +2.4V to +5.5V Supply Voltage Operation
  • Versions with 5nA Complete Shutdown Available (MAX4467/MAX4468)
  • Excellent Power-Supply Rejection Ratio: 112dB
  • Excellent Common-Mode Rejection Ratio: 126dB
  • High AVOL: 125dB (RL = 100kΩ)
  • Rail-to-Rail Outputs
  • Low 24µA Quiescent Supply Current
  • Gain Bandwidth Product:
    • 200kHz (MAX4465/MAX4467/MAX4469)
    • 600kHz AV ≥ 5 (MAX4466/MAX4468)
  • Available in Space-Saving Packages
    • 5-Pin SC70 (MAX4465/MAX4466)
    • 8-Pin SOT23 (MAX4467/MAX4468/MAX4469)


  • Cell Phones
  • Digital Dictation Devices
  • Headsets
  • Hearing Aids
  • Microphone Preamplifiers
  • Portable Computing
  • Voice-Recognition Systems

See parametric specs for Microphone Amplifiers (10)

Part NumberChannelsVSUPPLY
Input TypeExternal GainMicrophone BiasPackage/PinsBudgetary
minmaxtypminSee Notes
MAX4466 EndedYesNo
$0.25 @1k
MAX4467 0.02Yes
SOIC (N)/8
$0.35 @1k
MAX4468 0.03Yes
SOIC (N)/8
$0.34 @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: MAX4469 
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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