PAM8403 5V 2-Channel Stereo Audio Amplifier Module

The PAM8403 Stereo Audio Amplifier Module is a compact, high-efficiency Class-D audio amplifier designed to deliver clear and powerful sound from low-voltage sources. Operating on a 5V DC supply, it provides up to 3W + 3W output, making it ideal for portable speakers, DIY audio systems, and embedded audio applications. Its filterless design, low noise, and high efficiency ensure excellent audio performance with minimal heat generation.

Key Features

• Stereo Class-D Audio Amplifier

• Output Power: 3W + 3W (at 4Ω, 5V)

• Wide Supply Voltage: 2.5V – 5.5V DC

• High Efficiency: Up to 90%

• Low THD & Low Noise

• Filterless Design (no external LC filter required)

• Built-in Protection: Thermal shutdown & short-circuit protection

• Compact Size & Lightweight

• USB / Battery Powered Compatible

Technical Specifications

• Amplifier IC: PAM8403

• Channels: 2 (Stereo)

• Operating Voltage: 2.5V – 5.5V DC

• Recommended Voltage: 5V

• Speaker Impedance: 4Ω – 8Ω

• Output Power:

  • 3W + 3W @ 4Ω, 5V

  • 2W + 2W @ 8Ω, 5V

• Efficiency: ~90%

• Type: Class-D

• Operating Temperature: –40°C to +85°C

Applications

• Portable Bluetooth speakers

• DIY audio amplifier projects

• Arduino / ESP32 / Raspberry Pi audio output

• Mini sound systems

• USB-powered speakers

• Robotics and embedded audio systems

• Educational & hobby electronics projects

Pin Details / Connections

• VCC: +5V DC Supply

• GND: Ground

• L-IN: Left audio input

• R-IN: Right audio input

• L+ / L-: Left speaker output

• R+ / R-: Right speaker output

⚠️ Note: Speaker outputs are differential. Do not connect any output pin to ground.

Package Includes

• 1 × PAM8403 3W + 3W Stereo Audio Amplifier Module

(Speaker, power supply, and audio source not included)

Advantages

• Low power consumption

• No heat sink required for normal operation

• Simple plug-and-play usage

• Excellent sound quality for its size

• Ideal for battery-operated devices

Important Notes

• Use a stable, noise-free 5V power supply for best audio performance

• Recommended speaker power: ≤ 3W per channel

• Avoid shorting speaker output terminals