MAX98357 I2S 3W Class D Audio Amplifier Module

MAX98357 I2S 3W Class D Audio Amplifier Module

The MAX98357 takes I2S digital audio directly from your microcontroller and drives a speaker with a built-in 3W Class D amplifier — no separate DAC required. It decodes the I2S stream and amplifies it on one small board, making it a favourite for adding sound to ESP32, Raspberry Pi and Arduino projects.

Features

• I2S digital input with built-in DAC + 3W Class D amplifier
• Up to 3.2W output into a 4Ω speaker (at 5V)
• No MCLK required — simple 3-wire I2S (BCLK, LRC, DIN)
• Supports 8kHz to 96kHz sample rates
• Selectable gain: 3, 6, 9, 12 or 15 dB
• Drives a mono speaker directly
• Wide 2.5V–5.5V supply (works at 3.3V or 5V)
• High-efficiency Class D — runs cool, great for battery projects

Specifications

• Chip: MAX98357A
• Input: I2S digital audio
• Output power: up to 3.2W into 4Ω (5V)
• Gain: 3 / 6 / 9 / 12 / 15 dB (selectable)
• Sample rates: 8kHz – 96kHz
• Supply voltage: 2.5V – 5.5V
• Output: Mono, drives speaker directly

Applications

• Adding audio to ESP32, Raspberry Pi and Arduino projects
• Voice assistants, talking projects and sound effects
• Internet radio and media players
• Alarms, notifications and DIY audio

Package Includes

• 1 x MAX98357 I2S 3W Class D Audio Amplifier Module

Frequently Asked Questions

Do I need a separate DAC?
No — the MAX98357 has a built-in DAC and takes I2S digital audio directly.

How many wires does the I2S need?
Three: BCLK, LRC and DIN. No MCLK is required.

Is it mono or stereo?
Mono — it drives a single speaker. Use two boards for stereo.

Recommended Pairings

Works great with our ESP32-S3 board and Raspberry Pi 5. Learn more about Class-D amplification.