MAX98357 Class D Audio Amplifier Module

The MAX98357 Audio Amplifier Module is a compact and efficient mono Class D digital audio amplifier designed for modern embedded systems. It accepts digital audio input via the I2S interface, eliminating the need for an external DAC and simplifying audio integration with microcontrollers. With high efficiency and low distortion, this module can deliver up to 3.2W of output power to a speaker, making it perfect for projects using ESP32, Raspberry Pi, Arduino, and other I2S-capable controllers. Its small size and breadboard-friendly layout make it easy to integrate into portable or space-constrained applications.

Features:

• I2S Digital Audio Interface – Direct connection to I2S-capable microcontrollers (no DAC required)
• High Efficiency Class D Amplifier – Low heat generation and efficient power usage
• Mono Audio Output – Up to 3.2W output power into a 4Ω speaker (at 5V)
• Low Distortion Audio – THD+N < 0.1% for clear sound quality
• Automatic Clock Detection – Supports multiple I2S sample rates automatically
• Compact Module Design – Small and breadboard-friendly for easy integration

Specification:

• Amplifier IC: MAX98357
• Amplifier Type: Class D (Mono)
• Audio Input: I2S Digital Interface
• Output Power: Up to 3.2W @ 5V into 4Ω speaker
• Operating Voltage: 2.5V – 5.5V DC
• Supported Sample Rates: 8 kHz – 96 kHz
• THD+N: < 0.1%
• Efficiency: Up to 92%
• Speaker Load: 3Ω – 8Ω
• Module Dimensions: Approx. 18 mm × 19 mm

Applications:

• Voice assistants and smart speakers
• IoT audio feedback systems
• MP3/music playback in DIY projects
• Talking devices and robots
• Educational and STEM kits
• Portable sound systems or alarms