Adafruit I2S 3W Class D Amplifier Breakout - MAX98357A

Digital I2S mono Class D amplifier breakout based on the MAX98357A, delivering up to 3 W. Accepts I2S audio directly from Raspberry Pi, ESP32, or other I2S-capable hosts.

VIN
Supply voltage 2.5V-5.5V. A 5V supply gives more speaker power; 3.3V is usable for lower output power.
Type · powerVoltage · 3.3
GND
Ground reference
Type · ground
BCLK
I2S bit clock input.
Type · data
LRC
I2S left/right word-select clock input (also called LRCLK or WSEL).
Type · data
DIN
I2S serial data input.
Type · data
SD
Shutdown / channel-select pin. Low shuts down the amplifier; intermediate voltages select stereo average or right channel; high selects left channel. Breakout-board resistor defaults depend on VIN.
Type · digital
GAIN
Gain-select pin. Floating default is 9 dB; resistor or direct ties to GND/VIN select 15 dB, 12 dB, 6 dB, or 3 dB.
Type · analog
SPK+
Speaker output positive; connect to speaker or transducer terminal +.
Type · data
SPK-
Speaker output negative; connect to speaker or transducer terminal -.
Type · data

Pin	Type	Function	Voltage
VIN	power	Supply voltage 2.5V-5.5V. A 5V supply gives more speaker power; 3.3V is usable for lower output power.	3.3
GND	ground	Ground reference
BCLK	data	I2S bit clock input.
LRC	data	I2S left/right word-select clock input (also called LRCLK or WSEL).
DIN	data	I2S serial data input.
SD	digital	Shutdown / channel-select pin. Low shuts down the amplifier; intermediate voltages select stereo average or right channel; high selects left channel. Breakout-board resistor defaults depend on VIN.
GAIN	analog	Gain-select pin. Floating default is 9 dB; resistor or direct ties to GND/VIN select 15 dB, 12 dB, 6 dB, or 3 dB.
SPK+	data	Speaker output positive; connect to speaker or transducer terminal +.
SPK-	data	Speaker output negative; connect to speaker or transducer terminal -.

Start wiring

I2S · I2C · Analog · 3.3 – 5 V · Breakout

Verify supply voltage and logic levels before powering up.

Module pins: VIN, GND, BCLK, LRC, DIN, GAIN. Schematik maps them to your board in the app.

Amplifiers

14 other options

MAX98357A and MAX98357 I2S class-D amps, PAM8403 and TPA2012 analog stereo amps, MAX9744 20W stereo amp, LM386 and PAM8302 mono amps, and discrete op-amp packs for signal-level work.

View all 14

Related groups

4 groups

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Audio · Audio boards · 51 parts

Buzzers & speakers

Passive speakers from 1 W to 20 W (4–8 Ω), piezo buzzers active and passive, bone-conductor and surface transducers, and a BOSON buzzer module — all need a matching driver circuit or amplifier.

Audio · Buzzers & speakers · 23 parts

Microphones

MAX4466 and MAX9814 electret preamp breakouts for analog audio, I2S MEMS mics (ICS-43434, SPH0645LM4H, INMP441) for digital audio, PDM breakouts, ReSpeaker arrays for far-field pickup, and an LM386 sound detector.

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3D printing

DFRobot 1.75 mm PLA in 1 kg spools makes up the bulk of the group, in over 15 colors. Specialty options include PVA in both diameters, NinjaFlex flexible filament, Proto-Pasta conductive PLA, and wood-fill. OverLord printer spares and OverLord printers round out the hardware side.

Tools & prototyping · 3D printing · 53 parts

Pinout

Start wiring

Audio boards

Buzzers & speakers

Microphones

3D printing

Pinout

Start wiring

Audio boards

Buzzers & speakers

Microphones

3D printing