Ultra-small 2 3w D 5v Class D Audio Module PMA8403 Amplifier Board

An ultra-compact PAM8403-based 2 × 3 W Class D stereo amplifier running from 5 V — the absolute smallest practical stereo amplifier module available. Ideal for embedding in wearables, small robots, and compact IoT devices where audio output is needed but space is at an absolute premium.

🔹 Key Applications

• Compact wearable device audio output
• Small robot voice and alert sounds
• Miniature Bluetooth speaker core
• IoT device notification audio
• Embedded product audio output in tight PCBs
• Compact educational electronics audio experiments

🔹 Why Choose This Module?

• Ultra-compact form factor — smaller than a fingernail
• 5 V supply — directly from USB or Arduino 5 V rail
• 2 × 3 W stereo output — adequate for small speakers
• Class D efficiency — negligible heat at 3 W

🔹 Technical Specifications

• Chipset: PAM8403
• Supply Voltage: 5 V DC
• Output Power: 2 × 3 W (stereo)
• Efficiency: Class D
• Load: 4 Ω – 8 Ω

🔹 What's Included

1 × Ultra-small PAM8403 5V 2×3W Stereo Class D Amplifier Board

🔹 Pro Tip

💡 Mount directly on your main PCB and route 5 V power and audio signal traces to it. For best audio quality, decouple the 5 V supply with a 100 µF capacitor close to the module's power pins. Use with small 8 Ω 1 W speaker elements for the most compact audio system possible.

⚠️ Note: Always ensure proper heat dissipation and correct voltage configuration before powering connected devices.