PAM8403 Audio Amplifier 3W

The UNIT PAM8403 Audio Amplifier 3W is a Class D audio amplification module designed to deliver up to 3W per channel of stereo output with high efficiency. It is ideal for portable audio applications and projects with low-power devices, such as music players, portable speakers, and battery-powered systems.

• Power per channel: The PAM8403 can deliver up to 3W per channel into 4-ohm loads.
• Total power: In stereo mode, it can provide a total of up to 6W (3W per channel) when powered by a suitable source.
• Loads: The power output varies depending on the impedance of the connected speakers. At 8 ohms, the power per channel is approximately 1.5W.

Module Features

![](/img/accessories/ampli.jpg" width="800px)

• Operating voltage: 2.5V to 5.5V, compatible with USB power sources and lithium batteries.
• Output power: 3W per channel (4Ω, 5V).
• Current consumption: 5V/40mA at idle and 5V/500mA at maximum load.
• Efficiency: Up to 90%, minimizing energy consumption.
• Total Harmonic Distortion (THD): Less than 0.1%, ensuring excellent sound quality.
• Compact size: 19 mm x 22 mm, ideal for projects with limited space.
• Impedance range: Supports speakers with impedance from 4Ω to 8Ω.
• Protection: Includes overheating and short-circuit protection.
• Operating temperature: -40°C to 85°C, suitable for industrial applications and extreme environments.

Datasheet

For detailed technical information about the PAM8403 module, refer to the following document:

👉 Download the PAM8403 Datasheet

Pinout Table

The following table details the main connections for the UNIT PAM8403 amplifier module:

PIN	Description	Suggested Connection with RP2040/ESP32
VCC	Power supply (+)	3.3V
GND	Ground (-)	GND
INL	Left audio input	Specific pin for audio signal
INR	Right audio input	Specific pin for audio signal
OUTL	Left audio output	Speaker
OUTR	Right audio output	Speaker

For a detailed example of how to use the UNIT PAM8403 with the ESP32 microcontroller, check out the usage guide at the following link:

👉 UNIT PAM8403 Usage Guide with DualMCU ESP32

Purchase Links

You can purchase the UNIT PAM8403 Audio Amplifier 3W module directly from UNIT Electronics.

Technical Advantages:

• Class D Amplifier: Efficient amplification technology that reduces energy consumption.
• Ultra-low power consumption: Perfect for mobile and battery-powered devices.
• No heatsink required: Thanks to its energy efficiency, it remains cool even during extended use.
• Filterless design: Fewer external components required.
• Compact size: Easy to integrate into any project, with a small footprint that saves space.

Typical Applications

This amplifier is ideal for:

• Portable speakers.
• USB or battery-powered audio systems.
• DIY and educational projects.
• Any system requiring efficient audio amplification.