PAM8403 Digital Audio Amplifier Module

PAM8403 Digital Audio Amplifier Module (3W+3W Stereo)

The PAM8403 Digital Audio Amplifier Module is a high-efficiency, low-power, dual-channel Class-D amplifier solution perfect for portable audio applications, DIY speakers, and microcontroller projects (like Arduino or Raspberry Pi). Utilizing the advanced PAM8403 IC, this module delivers a robust 3W per channel output (for a total of 6W stereo) while maintaining low Total Harmonic Distortion plus Noise (THD+N) for excellent sound quality.

Its most compelling feature is the Class-D architecture, which boasts an efficiency of up to 90%, significantly surpassing traditional Class-AB amplifiers and making it highly suitable for battery-powered devices. The filterless design further simplifies your circuit by eliminating the need for bulky output LC filters, saving cost and PCB space. It operates reliably from a simple 5VDC supply, such as a USB port, and includes critical onboard protection against shorts and overheating.

🔌 Module Pinout and Features

• Power Input: VCC (2.5V−5.5V) and GND. A reliable 5V source is recommended for full power.
   
• Audio Input: INL (Left), INR (Right), and GND for the stereo audio source.
   
• Speaker Output: LO+/LO- (Left Channel Differential Output) and RO+/RO- (Right Channel Differential Output).
 
• Gain: Fixed gain, typically 24 dB.
• Volume: Often includes a compact, onboard rotary potentiometer (and sometimes a power switch) for easy volume control.
 

💡 Applications

• Portable USB Mini Speakers.
   
• DIY Bluetooth Speakers and MP3 Players.
 
• Audio enhancement for LCD monitors and TV projectors.
 
• Adding sound capability to Arduino and Raspberry Pi projects.
 

⚙️ Technical Specifications Summary

📦 Package Includes   

• 1 × PAM8403 Digital Audio Amplifier Module