---
product_id: 386208445
title: "Adafruit I2S MEMS Microphone Breakout - SPH0645LM4H (3421)"
brand: "adafruit"
price: "HK$271"
currency: HKD
in_stock: true
reviews_count: 5
category: "Adafruit"
url: https://www.desertcart.hk/products/386208445-adafruit-i2s-mems-microphone-breakout-sph0645lm4h-3421
store_origin: HK
region: Hong Kong
---

# Pure digital I2S output Ultra-light 5g weight 50Hz-15kHz frequency range Adafruit I2S MEMS Microphone Breakout - SPH0645LM4H (3421)

**Brand:** adafruit
**Price:** HK$271
**Availability:** ✅ In Stock

## Summary

> 🎧 Elevate your sound game with the tiniest digital mic that packs a punch!

## Quick Answers

- **What is this?** Adafruit I2S MEMS Microphone Breakout - SPH0645LM4H (3421) by adafruit
- **How much does it cost?** HK$271 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/386208445-adafruit-i2s-mems-microphone-breakout-sph0645lm4h-3421)

## Best For

- adafruit enthusiasts

## Why This Product

- Trusted adafruit brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact Powerhouse:** Tiny 7.6 x 5.1 x 2.5 cm footprint fits seamlessly into any sleek tech setup.
- • **Lightweight & Low Cost:** At just 5 grams and budget-friendly pricing, upgrade your audio projects without compromise.
- • **Unidirectional Precision:** Bottom-ported MEMS mic captures focused sound with 94dB sensitivity and 15dB SNR.
- • **Optimized for Modern Tech:** Designed for Cortex M-series and single-board computers for effortless integration.
- • **Crystal-Clear Digital Audio:** Purely digital I2S output ensures noise-free, high-fidelity sound capture.

## Overview

The Adafruit I2S MEMS Microphone Breakout (SPH0645LM4H) is a compact, bottom-ported digital microphone with a frequency response of 50Hz to 15kHz. Weighing only 5 grams, it delivers high sensitivity (94dB) and a unidirectional polar pattern optimized for Cortex M-series and single-board computers, making it ideal for professional-grade audio recording and detection in compact electronics.

## Description

Listen to this good news - we now have a breakout board for a super tiny I2S MEMS microphone. Just like 'classic' electret microphones, MEMS mics can detect sound and convert it to voltage, but they're way smaller and thinner. This microphone doesn't even have analog out, its purely digital. The I2S is a small, low cost MEMS mic with a range of about 50Hz - 15KHz, good for just about all general audio recording/detection.

Review: Excellent, I love these
Review: Gut

## Features

- small, low cost MEMS mic with a range of about 50Hz - 15KHz
- there are three digital pins
- The microphone is a single mono element
- This I2S MEMS microphone is bottom ported
- MEMS mics can detect sound and convert it to voltage

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B06XNL2GBW |
| Audio sensitivity | 94 Decibels |
| Best Sellers Rank | #51,208 in Computers ( See Top 100 in Computers ) #665 in Single-Board Computers |
| Colour | Blue |
| Compatible devices | Personal Computer |
| Frequency response | 15 KHz |
| Hardware platform | PC |
| Impedance | 16 Ohms |
| Included components | Microphone |
| Item dimensions L x W x H | 7.6 x 5.1 x 2.5 centimeters |
| Item model number | 3421 |
| Item weight | 5 Grams |
| Manufacturer | Adafruit |
| Material | Plastic, Resin |
| Microphone form factor | Mini |
| Number of batteries | 1 Lithium Ion batteries required. |
| Number of channels | 1 |
| Polar pattern | Unidirectional |
| Power source | Corded Electric |
| Product Dimensions | 7.62 x 5.08 x 2.54 cm; 5 g |
| Signal-to-noise ratio | 15 dB |
| Special features | Purely digital with a digital output, optimized for Cortex M-series chips and single-board computers |
| UPC | 717520031291 604776613404 |

## Product Details

- **Brand:** Adafruit
- **Connectivity technology:** I2S
- **Connector type:** XLR
- **Model name:** Adafruit I2S MEMS Microphone Breakout
- **Recommended uses for product:** Voice Recording, Video Recording, Video Conference

## Images

![Adafruit I2S MEMS Microphone Breakout - SPH0645LM4H (3421) - Image 1](https://m.media-amazon.com/images/I/611Bn5t945L.jpg)
![Adafruit I2S MEMS Microphone Breakout - SPH0645LM4H (3421) - Image 2](https://m.media-amazon.com/images/I/818LqHHMruL.jpg)
![Adafruit I2S MEMS Microphone Breakout - SPH0645LM4H (3421) - Image 3](https://m.media-amazon.com/images/I/81Ed5T04XTL.jpg)
![Adafruit I2S MEMS Microphone Breakout - SPH0645LM4H (3421) - Image 4](https://m.media-amazon.com/images/I/81ONZNcOfGL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by J***. on 23 January 2026*

Excellent, I love these

### ⭐⭐⭐⭐⭐ Review
*by E***Z on 24 October 2025*

Gut

### ⭐⭐⭐⭐⭐ Review
*by A***L on 2 September 2024*

This worked right out of the box. I have this working in Home Assistant via EspHome. Reach out to me if you have questions or need consultation in that application.

## Frequently Bought Together

- Adafruit I2S MEMS Microphone Breakout - SPH0645LM4H (3421)
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**Shop now:** [https://www.desertcart.hk/products/386208445-adafruit-i2s-mems-microphone-breakout-sph0645lm4h-3421](https://www.desertcart.hk/products/386208445-adafruit-i2s-mems-microphone-breakout-sph0645lm4h-3421)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-05*