The PAM8403 is a high-performance, 3W per channel stereo Class-D audio power amplifier. It provides the efficiency of Class-D circuits with the high fidelity of much larger systems. Because it operates on 5V DC, it is perfect for portable applications—you can power it directly from a laptop USB port, a power bank, or a single Li-ion battery. Despite being the size of a postage stamp, it can drive two 4Ω or 8Ω speakers with ease.
Key Features ✨
Ultra-Efficient Class D: High efficiency (over 90%) ensures the board doesn’t get hot, even during long playback sessions.
Low Noise: Features high-quality signal processing to keep the “hiss” and “pop” noise at a minimum.
Dual Channel Stereo: Delivers 3W + 3W of power, enough to fill a small room when paired with the right speakers.
USB Power Compatible: Works perfectly with 5V power supplies, making it ideal for USB-powered desktop speakers.
Breadboard Friendly: Simple pinout makes it easy to solder or use in a prototype.
Technical Specifications ⚙️
| Feature | Specification |
| Operating Voltage | 2.5V to 5.5V DC (Ideal: 5V) |
| Output Power | 3 Watts + 3 Watts (Stereo) |
| Speaker Impedance | 4Ω or 8Ω |
| Signal-to-Noise Ratio | 90dB |
| Efficiency | >90% |
| Dimensions | 21mm x 18mm x 3mm |
| Protection | Short-Circuit and Over-Temperature Protection |
Perfect For: 🛠️
DIY Bluetooth Speakers: Combine it with a Bluetooth module for a portable audio rig.
Handheld Gaming: Add sound to GameBoy or Raspberry Pi Zero mods.
Smart Home: Give your AI voice assistant or doorbell a clear voice.
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