MAX98357 i2s Digital Audio Amplifier Module

🔹 MAX98357 I2S Digital Audio Amplifier Module – Class D, Mono Output

The MAX98357 I2S amplifier module is a high-efficiency digital Class D audio amplifier that receives I2S digital audio data directly from microcontrollers like ESP32, Raspberry Pi, and Arduino, delivering clean, high-quality sound output with minimal external components .

✅ Specifications:

Chipset: MAX98357A / MAX98357B

Amplifier Type: Class D Digital Audio Amplifier

Output Power: 3.2W max @ 4Ω (5V supply)

Supply Voltage: 2.5V – 5.5V DC

Quiescent Current: 2.4mA

Standby Current: 340µA

Efficiency: >82% (5V, 4Ω load)

THD+N: <0.02% @ 1W (4Ω)

Sample Rate: 8kHz – 96kHz

Dynamic Range: 105dB

Gain Settings: 3dB, 6dB, 9dB, 12dB, 15dB (selectable)

Output Configuration: BTL (Bridge-Tied Load), mono channel

Load Impedance: 4Ω – 8Ω

Communication Interface: I2S (BCLK, LRC, DIN) – No MCLK required

Module Interface: PH2.0 speaker connector + stamp holes for direct soldering

Module Size: ~18mm x 18mm

Operating Temperature: -40°C to +85°C

📦 Features:
✔️ Direct I2S digital input – no DAC required
✔️ High efficiency Class D operation (>82%)
✔️ Filterless operation – saves space and components
✔️ Five selectable gain settings (3dB – 15dB)
✔️ Adjustable channel output: Left, Right, or Mono Mix
✔️ Click-and-pop suppression
✔️ Short-circuit and thermal protection
✔️ Small footprint with stamp holes for PCB integration
✔️ Compatible with 3.3V – 5V logic levels
✔️ No MCLK required – simplifies wiring

📦 Applications:
✔️ Bluetooth audio players and speakers
✔️ ESP32 / Raspberry Pi audio projects
✔️ IoT audio nodes and smart home voice devices
✔️ Internet radio and streaming players
✔️ Portable battery-powered speakers
✔️ Robot voice feedback systems
✔️ DIY alarm and notification systems
✔️ Audio playback for retro gaming consoles