Single-/Dual-Supply, Stereo 16W, Class D Amplifier with Differential Inputs

High-Efficiency Class D Amplifier Drives 4Ω Loads with 87% Efficiency, 8Ω Loads with 92% Efficiency

Please check latest availability status for a specific part variant.


The MAX9742 stereo Class D audio power amplifier delivers up to 2 x 16W into 4Ω loads. The MAX9742 features high-power efficiency (92% with 8Ω loads), eliminating the need for a bulky heatsink and conserving power. The MAX9742 operates from a 20V to 40V single supply or a ±10V to ±20V dual supply. Features include fully differential inputs, comprehensive click-and-pop suppression, low-power shutdown mode, and an externally adjustable gain. Short-circuit and thermal-overload protection prevent the device from being damaged during a fault condition.

The MAX9742 is available in a thermally efficient 36-pin TQFN (6mm x 6mm x 0.8mm) package and is specified over the -40°C to +85°C extended temperature range.
MAX9742: Simplified Block Diagram MAX9742: Simplified Block Diagram Enlarge+

Key Features

  • 2 x 16W Output Power (RL = 4Ω, THD+N = 10%)
  • High Efficiency: Up to 92% with RL = 8Ω
  • Mute and Shutdown Modes
  • Differential Inputs Suppress Common-Mode Noise
  • Adjustable Gain
  • Integrated Click-and-Pop Suppression
  • Low 0.06% THD+N at 3.5W, RL = 8Ω
  • Output Short-Circuit and Thermal Protection
  • Available in Space-Saving, 6mm x 6mm, 36-Pin TQFN Package


  • Audio Docking Stations
  • CRT TVs
  • Flat-Panel Display TVs
  • Multimedia Monitors

MAX9742EVKIT: Evaluation Kit for the MAX9742

CAD Symbols and Footprints

  • MAX9742ETX+
  • MAX9742ETX+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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

    Boosted Class-D Amplifier with Integrated Dynamic Speaker Management

    • Integrated Speaker Current and Voltage Sense Requires no External Components
    • Integrated Programmable 10V Boost Converter
    • Integrated Dynamic Speaker Management

    PDF Title