Adafruit MCP3421 18-Bit ADC - STEMMA QT / Qwiic

Adafruit MCP3421 18-Bit ADC - STEMMA QT / Qwiic

Marsoni

M251S

$10.00

Get it in 3 business days with 1 day shipping. Friday, May 29

Adafruit MCP3421 18-Bit ADC - STEMMA QT / QwiicThe Adafruit MCP3421 18 Bit ADC is a simple, inexpensive, and easy to use 18 bit, 240 SPS, single channel ADC with an I2C interface capable of up to 3. 4MHz clock rate. It features differential inputs, adjustable gain, and a built in precision low drift reference voltage, making it ideal for reading sensors like strain gauges, pressure sensors, or thermocouples. The ADC supports multiple bit resolutions: 12 bit at 240 SPS for faster sampling, and 18

Easy Shipping

Quick Dispatch:

Your Adafruit MCP3421 18-Bit ADC - STEMMA QT / Qwiic orders ship within 1-2 business days.

Delivery Options:

Standard: 3-7 business days
Fast: 2-3 business days
Express: 1-2 business days

Order Tracking:

You'll receive a tracking link by email once your Adafruit MCP3421 18-Bit ADC - STEMMA QT / Qwiic ships.

Need Help?
Questions about Adafruit MCP3421 18-Bit ADC - STEMMA QT / Qwiic, sizing, or delivery? We're just an email away.

Live Shipping Estimates:
Enter your location at checkout to see available shipping methods and costs for Adafruit MCP3421 18-Bit ADC - STEMMA QT / Qwiic in your area.

Get Shipping Estimates

Country Zip/Postal Code

Exchange/Return Notes

We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
To process your return/exchange, please contact us at [email protected]
Please click here for more details>>> Return & Exchange Policy

So the quality of this not great, but good enough and they look nice enough on the wall. However, the bracket holes are not spaced at 16" intervals. WTF? I'm not sure who designed this thing. The molly plugs that came with it look OK, but to play it safe I used a cobalt steel drill bit and made my own holes in the bracket. Easy enough with some wd40. My other pick with this is that the screws to anchor the shelf to the bracket are black and and very obvious... they should have supplied some kind of cap.

WAS THIS REVIEW HELPFUL?YesReportShare

Reviewed in the United States on January 31, 2026