The PAM8403 Audio Amplifier Module is a compact, high-efficiency Class-D stereo amplifier designed for low-power audio applications. Capable of delivering clear and loud sound from small speakers, it is ideal for portable devices, DIY audio projects, Bluetooth speakers, toys, and embedded systems. With minimal external components and high efficiency, the PAM8403 is widely used where space, power consumption, and sound quality are important.
Core Amplifier Specifications
• Amplifier Type: Class-D stereo audio amplifier
• Amplifier IC: PAM8403
• Channels: 2 (Stereo)
• Output Power: Up to 3 W × 2 (at 5 V, 4 Ω)
Electrical & Interface
• Operating Voltage: 2.5 V – 5.5 V DC
• Recommended Voltage: 5 V
• Input Type: Analog audio (L, R, GND)
• Speaker Output: L+, L−, R+, R−
• Load Impedance: 4 Ω – 8 Ω
• Efficiency: Up to ~90%
Performance Characteristics
• Low distortion and low noise output
• No heatsink required due to high efficiency
• Pop-free startup and shutdown
• Stable performance for battery-powered systems
Physical Characteristics
• Module Type: PCB-mounted audio amplifier
• Form Factor: Ultra-compact
• Onboard Components: Amplifier IC and passive components
• Lightweight and easy to integrate
Compatibility
• Arduino and ESP32 audio projects
• Bluetooth audio receiver modules
• MP3 player modules (DFPlayer Mini)
• Raspberry Pi audio output
• Portable speaker systems
Key Advantages
• High efficiency with minimal heat
• Works directly from 5 V supply
• Compact size for space-constrained designs
• Simple analog audio interface
Technical Insights
• Class-D architecture reduces power loss
• Differential speaker outputs eliminate coupling capacitors
• Audio input should be properly filtered
• Ground loops can introduce noise if wiring is poor
Applications
• Bluetooth speakers
• Portable audio systems
• DIY sound projects
• Toys and talking devices
• Embedded audio playback systems
Pro Tip
• Use short speaker wires to reduce noise
• Power from a clean, regulated supply
• Match speaker impedance for best output
• Add volume control using an external potentiometer
Package Includes
• 1 × PAM8403 Audio Amplifier Module