Description

INMP441 I2S MEMS Microphone Module
Product Overview

The INMP441 I2S MEMS Microphone Module is a high-performance, omnidirectional digital microphone designed for clear and accurate audio capture. It uses an I2S digital interface with 24-bit audio output, allowing direct connection to microcontrollers and processors such as ESP32, ESP8266, DSPs, and other I2S-compatible devices without requiring an external audio codec.

Its compact size, low power consumption, and high signal-to-noise ratio make it suitable for voice recognition, smart-home devices, IoT projects, robotics, audio recording, and sound-monitoring applications.

Key Features
High-quality MEMS digital microphone
Omnidirectional sound pickup
24-bit I2S digital audio output
High Signal-to-Noise Ratio: 61 dBA
Sensitivity: -26 dBFS
Frequency response: 60 Hz – 15 kHz
Low power consumption: approximately 1.4 mA
Left/Right channel selection through L/R pin
Direct connection to I2S-compatible microcontrollers
Compact and lightweight design
Suitable for embedded and IoT applications
Technical Specifications
Parameter Specification
Module INMP441
Sensor Type MEMS Microphone
Directionality Omnidirectional
Interface I2S
Audio Resolution 24-bit
Sensitivity -26 dBFS
SNR 61 dBA
Frequency Response 60 Hz – 15 kHz
Operating Voltage 1.8V – 3.3V
Current Consumption Approx. 1.4 mA
Channel Selection Left / Right
Output Digital Audio
Operating Temperature -40°C to +85°C
Main Applications Voice, Audio, IoT, Robotics

Specifications are based primarily on the INMP441 manufacturer’s documentation; module-board dimensions can vary by manufacturer.

Pin Configuration
VDD – Power supply
GND – Ground
SCK – I2S Serial Clock
WS – I2S Word Select / Left-Right Clock
SD – Digital Serial Data Output
L/R – Left or Right audio-channel selection
Applications
ESP32 Voice-Controlled Projects
AI Voice Assistant Projects
Smart Home Devices
Voice Recognition Systems
Digital Audio Recording
Audio Streaming
Sound Detection and Monitoring
Audio Spectrum Analyzer
Robotics and Human-Machine Interaction
IoT and Wearable Devices
Security and Surveillance Systems
Compatibility

The INMP441 is particularly suitable for ESP32 and other microcontrollers with I2S support. Two microphones can also be used on the same I2S bus by configuring their L/R channel selection appropriately.

Important Note

INMP441 is a digital I2S microphone, not an analog microphone module. Use an appropriate 1.8V–3.3V supply and an I2S-capable controller. Do not apply 5V directly to the microphone module.kazitechbd.com