MAX98357A I2S 3W Class D Audio Amplifier DAC Module ESP32 Raspberry Pi

🔧 MAX98357A I2S 3W Class D Audio Amplifier DAC Module | AuscomTech

The MAX98357A is a compact digital audio amplifier module for adding speaker output to I2S-capable microcontroller and single-board computer projects.

It combines I2S digital audio decoding with an efficient Class D amplifier, allowing direct connection to a small 4Ω or 8Ω speaker without needing a separate DAC or amplifier board.

Ideal for ESP32 audio players, Raspberry Pi projects, Arduino-compatible I2S builds, voice prompts, alerts, embedded sound effects, and compact DIY speaker systems.

⭐ Key Features

• Direct I2S Audio Input – connects to compatible digital audio outputs using BCLK, LRC and DIN signals
• Built-In DAC and Amplifier – converts digital audio into amplified speaker output on one small board
• 3W Class D Output – efficient mono amplification suitable for portable and embedded audio projects
• No MCLK Required – simplifies wiring for supported ESP32, Raspberry Pi and other I2S sources
• Configurable Gain – gain and channel selection can be adjusted using the GAIN pin
• Shutdown Control – SD pin allows mute or low-power shutdown control from a microcontroller
• Wide Supply Range – operates from DC 2.5V to 5.5V for flexible project power options
• Compact Breakout Design – easy to integrate into small speakers, sound modules and custom electronics

📊 Technical Specifications

• Main IC: MAX98357A
• Module Type: I2S DAC and Class D amplifier module
• Audio Input: I2S digital audio
• Output Type: Mono speaker output
• Output Power: up to 3.2W at 4Ω, 10% THD
• Output Power: up to 1.8W at 8Ω, 10% THD
• Sample Rate Support: 8kHz to 96kHz
• Supply Voltage: DC 2.5V to 5.5V
• Speaker Connection: 2-pin screw terminal
• Pin Connections: LRC, BCLK, DIN, GAIN, SD, GND, VCC
• Board Size: approx. 20.6 × 17.1 mm
• Compatible Platforms: ESP32, Raspberry Pi, Arduino-compatible I2S controllers and other I2S audio sources

🧩 Typical Applications

• ESP32 internet radio and audio player projects
• Raspberry Pi speaker output
• Arduino-compatible I2S sound projects
• Voice prompt and notification systems
• DIY compact speaker builds
• Embedded sound effects and alert modules
• Robotics audio feedback

⚠️ Important Notes

• Requires an I2S-compatible audio source.
• This module is for mono speaker output, not stereo output.
• Speaker, controller board and jumper wires are not included.
• Output power depends on supply voltage, speaker impedance and audio signal level.
• Header pins and screw terminal may require soldering before use.
• Check wiring and speaker impedance before applying power.

📦 Package Includes

• 1 × MAX98357A I2S 3W Class D Audio Amplifier DAC Module
• 1 × Pin Header Set
• 1 × 2-Pin Screw Terminal

🔗 Recommended Accessories (Not Included)

• ESP32 Development Board – for wireless audio playback projects
• Raspberry Pi Board – for compact digital audio output
• 4Ω or 8Ω Speaker – suitable load for the amplifier output
• Jumper Wires – for connecting power and I2S signal pins