PAM8403 5V Mini Two-Channel Stereo 3W Class-D Audio Amplifier

PAM8403 5V 3W+3W Stereo Class-D Audio Amplifier Module – Mini Dual-Channel Audio Power Amplifier

Product Description

The PAM8403 5V Two-Channel Stereo Audio Amplifier Module is a compact and high-efficiency Class-D audio power amplifier designed for portable electronics, DIY audio systems, robotics, gaming devices, and embedded projects.

Based on the PAM8403 amplifier IC, the module provides 3W + 3W stereo audio output when powered by 5V and connected to suitable 4Ω speakers. Its filterless Class-D architecture allows speakers to be driven directly without requiring bulky external LC output filters, helping reduce PCB size and simplify system design.

The module operates from a wide 2.5V to 5.5V DC supply range, making it suitable for USB-powered systems, battery-powered electronics, Arduino projects, Raspberry Pi applications, Bluetooth speakers, and other low-voltage audio devices.

With typical efficiency of up to 87%, the PAM8403 produces less heat than many traditional Class-AB amplifiers, making it well suited for compact and portable devices where power efficiency is important.

The module also incorporates short-circuit protection and thermal shutdown, helping protect the amplifier during abnormal operating conditions. Its compact size makes it easy to integrate into small enclosures and custom electronic products.

Features

• PAM8403 Class-D audio amplifier IC
• Two-channel stereo output
• 3W + 3W output power at 5V with 4Ω speakers
• High efficiency up to 87%
• Wide 2.5V–5.5V DC operating voltage
• Filterless amplifier architecture
• Direct speaker connection
• Low noise and low THD+N
• Signal-to-noise ratio up to 80dB
• 24dB maximum gain
• Built-in short-circuit protection
• Built-in thermal shutdown protection
• Low EMI design
• Compact and lightweight PCB
• Suitable for USB-powered applications
• Ideal for Arduino, Raspberry Pi, and Bluetooth projects

Specifications

Parameter	Specification
Product Type	Stereo Class-D Audio Amplifier Module
Amplifier IC	PAM8403
Operating Voltage	2.5V – 5.5V DC
Recommended Supply	5V DC
Output Power	3W + 3W
Speaker Load	4Ω
Efficiency	Up to 87% Typical
Signal-to-Noise Ratio	80 dB
Gain	24 dB Maximum
Channels	2 / Stereo
Protection	Short Circuit, Thermal Shutdown
Dimensions	21.1 × 18.5 × 3 mm
Weight	Approximately 5 g

Working Principle

The PAM8403 receives a low-level stereo audio signal from a compatible audio source and amplifies it to a higher power level suitable for driving small speakers.

The module uses a Class-D switching amplifier architecture, which provides high efficiency and reduced heat generation compared with conventional linear amplifier designs.

The left and right channels are separately amplified and delivered to their corresponding speaker outputs, providing stereo audio reproduction.

Because the amplifier uses a bridge-tied load (BTL) output configuration, both speaker terminals are actively driven. This allows higher output power from a low-voltage supply but requires correct speaker wiring.

High-Efficiency Class-D Design

The Class-D architecture allows the amplifier to operate efficiently while maintaining a compact size.

At a 5V supply with suitable 4Ω speakers, the module can deliver approximately 3W per channel, providing a combined stereo output of up to 3W + 3W under suitable operating conditions.

The high efficiency also makes the module useful for battery-powered products where minimizing energy consumption and heat generation is important.

Filterless Architecture

The PAM8403 uses a filterless output architecture that can drive suitable speakers directly without requiring large external LC output filters in the typical module implementation.

This helps:

• Reduce component count
• Save PCB space
• Simplify circuit design
• Reduce system size
• Lower overall implementation cost

Protection Features

The amplifier includes built-in protection features for improved reliability:

• Short-Circuit Protection: Helps protect the amplifier during speaker-output short circuits.
• Thermal Shutdown: Helps protect the IC from excessive temperature.
• Low EMI Design: Helps reduce unwanted electromagnetic interference in suitable installations.

Typical Application Scenarios

Portable Audio

Suitable for DIY Bluetooth speakers, handheld audio players, portable music devices, and other compact speaker systems.

Robotics

Can add voice prompts, sound effects, alarms, and audio feedback to robots and autonomous systems.

Gaming Projects

Suitable for retro gaming consoles, arcade machines, Raspberry Pi handhelds, and custom game systems requiring stereo audio.

Commercial Electronics

Can be used for audio output in suitable LCD systems, projectors, speakerphones, interactive displays, and embedded products.

Applications

• DIY Bluetooth speakers
• Portable audio systems
• Arduino audio projects
• Raspberry Pi audio projects
• ESP32 audio projects
• Robotics voice systems
• Robot sound effects
• Gaming consoles
• Retro arcade machines
• Portable game devices
• Embedded audio systems
• LCD monitor audio
• Projector audio
• Speakerphone systems
• Smart home devices
• Educational electronics
• Battery-powered audio devices
• Custom speaker systems

Package Includes

• 1 × PAM8403 Mini 3W + 3W Digital Power Amplifier Board

Product Disclaimer

Product images are shown for illustrative and representational purposes only. The actual module may vary slightly in PCB colour, component placement, terminal arrangement, dimensions, or other visual details depending on the manufacturing batch.

Speakers, audio cables, USB cables, batteries, power supplies, Bluetooth modules, and other accessories shown in product images are not included unless specifically mentioned in the package contents.

Actual output power depends on supply voltage, speaker impedance, audio signal, heat dissipation, and operating conditions.

Important Notes

Speaker Connection

The PAM8403 uses a BTL (bridge-tied load) output configuration. Do not connect the negative terminals of the left and right speaker outputs together.

Each speaker should be connected only to its corresponding positive and negative output terminals.

Audio Input Wiring

For improved audio quality and reduced interference, use shielded wire for the audio input signal where practical.

Power Supply

Use a clean and stable 2.5V–5.5V DC power source. A regulated 5V supply is recommended when maximum specified output power is required.

Speaker Load

For the specified 3W + 3W output at 5V, use suitable 4Ω speakers and ensure that the speakers are rated appropriately for the expected output power.

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