MAX98357 I2S 3W Class D Amplifier Breakout Board

The MAX98357 is a compact, high-efficiency Class D audio amplifier breakout board designed to work directly with digital audio sources over the I2S (Inter-IC Sound) interface. Unlike traditional analog amplifiers, this module accepts a digital audio stream directly from your microcontroller — no separate DAC (digital-to-analog converter) is needed, since the DAC is built right into the chip.

This makes it an excellent choice for adding clear, powerful audio output to embedded projects like voice assistants, smart speakers, text-to-speech systems, audio alerts, and music playback devices.

Key Features:

• Built-in Class D amplifier with integrated DAC — no external DAC required
• Delivers up to 3W of audio output power (into a compatible 4Ω/8Ω speaker)
• I2S digital audio input — direct interface, no analog noise pickup
• High efficiency (Class D design) — runs cool, ideal for battery-powered projects
• Small breakout form factor — easy to wire into existing projects
• Gain control pin — adjustable output gain for different speaker sizes

Compatibility Note:
This module communicates over I2S, so it works with microcontrollers and single-board computers that support I2S output — such as ESP32, Raspberry Pi, and STM32. It is not directly compatible with basic Arduino Uno/Nano boards, since they lack native I2S support. If you're building on Uno/Nano, consider a standard analog amplifier module instead.

Common Applications:

• ESP32-based voice assistants and smart speakers
• Raspberry Pi audio/media projects
• Text-to-speech and audio notification systems
• IoT devices requiring compact audio output
• DIY Bluetooth speaker projects

What's in the box:

• 1 x MAX98357 I2S Amplifier Breakout Board ( Chip Size Large)