MAX98357A I2S Class D Amplifier Module – Stereo PCM Input
MAX98357A I2S Class D Amplifier Module – Stereo PCM Input
MAX98357A I2S Class D Amplifier Module – Stereo PCM Input
Upgrade your audio project with the MAX98357A Class D Amplifier Module, a compact and highly efficient digital audio amplifier designed for makers, engineers, and audio enthusiasts alike. Featuring an I2S (Inter-IC Sound) digital audio interface and supporting Stereo PCM input, this module delivers clean, crisp audio output with minimal power consumption — making it ideal for Raspberry Pi, Arduino, ESP32, and other microcontroller-based audio builds.
Measuring just 23 × 20 mm, this tiny powerhouse punches well above its size. Available in 3 color options, it fits seamlessly into compact enclosures and DIY builds. Whether you're building a smart speaker, a media player, a home automation audio node, or any embedded audio system, this module is your go-to solution.
Key Features
- IC: MAX98357A Class D Amplifier
- Audio Interface: I2S (Inter-IC Sound) digital input
- Input Format: Stereo PCM / TDM (up to 8-channel TDM support)
- Output: Single-ended speaker output, up to 3.2W into 4Ω at 5V
- Efficiency: High-efficiency Class D design reduces heat and extends battery life in portable builds
- Compact Size: 23 × 20 mm — easy to integrate into tight spaces
- No Built-in Battery: Requires external power supply (3V–5.5V)
- Available in 3 color options to match your build aesthetic
- New and high quality — ready to use right out of the box
What Is I2S and Why Does It Matter?
The I2S (Inter-IC Sound) protocol is a serial bus interface standard used to connect digital audio devices. Unlike analog audio connections, I2S transmits audio digitally, resulting in a cleaner signal with no analog noise pickup. The MAX98357A decodes this digital signal directly, driving your speakers with exceptional fidelity and efficiency.
Compatible With
- Raspberry Pi (Zero, 3, 4, 5)
- Arduino boards
- ESP32 / ESP8266
- STM32 and other ARM microcontrollers
- Any microcontroller with an I2S output
Ideal Applications
- DIY smart speakers and voice assistants
- Embedded audio and media players
- Home automation audio nodes
- IoT audio projects
- Prototyping and educational electronics builds
Technical Specifications
- Chip: MAX98357A
- Amplifier Class: Class D
- Interface: I2S
- Input: Stereo PCM / 8-Channel TDM
- Operating Voltage: 3V – 5.5V
- Output Power: Up to 3.2W @ 4Ω / 5V
- Dimensions: 23 × 20 mm
- Built-in Battery: No
For more information on audio interface standards used in embedded electronics, visit the National Institute of Standards and Technology (NIST).
Frequently Asked Questions
Q: What is the MAX98357A Class D Amplifier Module and what does it do?
A: The MAX98357A is a compact, high-efficiency Class D digital audio amplifier module that accepts I2S (Inter-IC Sound) stereo PCM digital audio input and drives a speaker directly. It is widely used in DIY audio projects, smart speakers, Raspberry Pi builds, and embedded media players. It supports up to 3.2W output power and 8-channel TDM input.
Q: Is the MAX98357A module compatible with Raspberry Pi and Arduino?
A: Yes! The MAX98357A I2S amplifier module is fully compatible with Raspberry Pi (all models with GPIO), Arduino boards, ESP32, ESP8266, STM32, and virtually any microcontroller that supports the I2S digital audio protocol. Simply connect the BCLK, LRCLK (WS), and DIN pins to your microcontroller's I2S output pins and supply 3V–5.5V power.
Q: Does the module require a battery or external power supply?
A: The MAX98357A module does not have a built-in battery. It requires an external power supply in the range of 3V to 5.5V DC. For best performance and maximum output power, a 5V power supply is recommended.
Q: What speaker impedance is recommended for this amplifier module?
A: The MAX98357A Class D amplifier is optimized for use with 4Ω or 8Ω speakers. It delivers up to 3.2W into a 4Ω load at 5V, making it suitable for small to medium speakers used in portable or desktop audio applications.
Q: What is TDM support on the MAX98357A module?
A: TDM stands for Time Division Multiplexing. The MAX98357A supports up to 8-channel TDM input over the I2S interface, allowing multiple audio channels to be transmitted simultaneously on a single data line — ideal for more complex multi-channel audio systems and advanced embedded audio projects.