INMP441 MEMS High Precision Omnidirectional Microphone I2S

The INMP441 is a high-performance, low-power, digital-output omnidirectional MEMS microphone module with a bottom port. It integrates a MEMS sensor, signal conditioning, analog-to-digital converter, anti-aliasing filter, and an industry-standard 24-bit I2S interface, allowing direct connection to microcontrollers and digital processors such as the ESP32, STM32, and Raspberry Pi without requiring an external audio codec [web:71][web:73].

Key Features

• Digital I2S interface with high-precision 24-bit data
• Omnidirectional bottom-port MEMS sensor
• High signal-to-noise ratio of 61 dBA
• High sensitivity of -26 dBFS
• Stable flat frequency response from 60 Hz to 15 kHz
• Low power consumption with current draw of only 1.4 mA
• High power supply rejection (PSR) of -75 dBFS
• Direct connection to digital processors without audio codec
• Compact surface-mount package for space-constrained designs
• Easy integration with ESP32, Arduino, Raspberry Pi, and STM32

Technical Specifications

Applications

• Voice Recognition Systems
• Smart Home Assistants
• High-Fidelity Audio Recording
• IoT Audio and Sound Monitoring
• Voice-Controlled Robotics
• Sound Level and Noise Monitoring
• Wearable and Battery-Powered Audio Devices
• DSP and Embedded Audio Processing

Important Notes

• This is a bottom-port microphone; ensure the sound inlet hole on the PCB is not obstructed by tape, glue, or enclosure walls.
• Operates at 1.8V to 3.3V logic; use a level shifter if interfacing with 5V microcontrollers.
• L/R pin selects the I2S channel: connect to GND for left channel, or VDD for right channel.
• Requires a microcontroller or processor with I2S peripheral support for proper operation.
• Avoid exposing the microphone to moisture, dust, or mechanical shock.
• Refer to your microcontroller’s I2S pin mapping for correct SCK, WS, and SD wiring.