PAM8403 Stereo Audio Amplifier Module

PAM8403 Audio Amplifier Module
PAM8403 Audio Amplifier Module
PAM8403 Module Pinout
PAM8403 Audio Amplifier Module
PAM8403 Module Pinout

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The PAM8403 is a 2-channel, 3W, class-D audio amplifier module that features low harmonic distortion and high efficiency. It offers low THD+N, allowing it to achieve high-quality sound reproduction. Operating voltage for this module range from 2.5 V to 5.5 V, making it ideal for adding the audio capability to your MP3 and MP4 player projects.


Pin Configuration of PAM8403 Module

Pin No.

Pin Name




Left Channel Positive Output



Left Channel Negative Output



Left Channel Input



Right Channel Input



Right Channel Negative Output



Right Channel Positive Output



Positive Supply



Ground Pin


PAM8403 Audio Amplifier Module Specifications

  • 2 channels 3 W PAM8403 audio amplifier
  • Output Power: 3 W + 3 W (at 4 ohm)
  • Working Voltage: 2.5 to 5.5 V
  • Board Size: 24 x 15 mm
  • High amplification efficiency 85%
  • Unique without LC filter class D digital power board
  • Can use computer USB power supply directly


Alternatives for PAM8403: XH-M228


Brief about PAM8403 Module

The PAM8403 is a 2-channel, 3W, class-D audio amplifier. The internal circuit diagram of the PAM8403 Module is shown below. The new filterless architecture allows the device to drive the speaker directly, requiring no low-pass output filters. With the same numbers of external components, the efficiency of the PAM8403 is much better than that of Class-AB cousins. As shown in circuit diagram output speakers connects to ± OUT_L and ± OUT_R directly. INL and INR pins are used for left and right channel input. These pins are connected through a 0.47µf ceramic capacitor to reduce noise caused by the power supply coupling into the output drive signal. The recommended operating voltage for PAM8403 is 5.5V.

PAM8403 Module Internal Circuit Diagram


Applications PAM8403 Module

  • LCD Monitors / TV Projectors
  • Notebook Computers
  • Portable Speakers
  • Portable DVD Players, Game Machines
  • Cellular Phones/Speaker Phones

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