INMP441 MEMS microphone module with I2S interface

The INMP441 is a high-performance, low-power MEMS microphone module with an I2S digital output interface. It delivers clean, low-noise audio capture in a compact PCB form factor, making it the go-to choice for voice recognition, audio processing, and IoT audio applications. Unlike analogue microphone modules, the I2S interface provides a direct digital audio stream, eliminating ADC noise and simplifying integration with modern microcontrollers.

Key Features:

• Digital I2S output — no ADC required
• Omnidirectional MEMS microphone element
• Low noise floor: −26 dBFS (A-weighted)
• High SNR: 61 dBA
• Wide frequency response: 60 Hz – 15 kHz
• Low power consumption: 1.4 mA active, 8 μA sleep
• Supply voltage: 1.8V – 3.3V
• L/R channel select pin for stereo pairing
• Compact breakout PCB with 0.1" pitch headers

Pinout:

• VDD: 3.3V power supply
• GND: Ground
• SD: Serial data (I2S data out)
• SCK: Serial clock (I2S bit clock)
• WS: Word select (I2S left/right clock)
• L/R: Channel select (GND = left, VDD = right)

Compatible With:

• ESP32 (native I2S peripheral)
• ESP8266 (with software I2S)
• Raspberry Pi (I2S via GPIO)
• STM32 and other ARM microcontrollers with I2S
• Arduino (with I2S library)

Applications:

• Voice recognition and wake-word detection
• Smart home and IoT audio devices
• Audio spectrum analysers
• Noise monitoring systems
• Stereo audio recording (pair two modules using L/R pin)

Available in two variants: Original (genuine INMP441 IC) and Clone/Copy (compatible alternative IC — suitable for most DIY applications).