MCHPATSAMD21G18A-MUT

Overview

The ATSAMD21G18A-MUT is a 32-bit ARM Cortex-M0+ microcontroller from Microchip's SAM D21 family. It combines 256 KB of Flash, 32 KB of RAM, and a 48 MHz CPU with common serial interfaces and USB support in a compact 48-pin QFN package. It is a good fit for embedded designs that need more capability than an 8-bit MCU but still want low power and a simple peripheral set.

Why Choose This Part

This MCU gives you a balanced mix of Flash, RAM, peripheral set, and USB capability without moving to a larger Cortex-M class device. The SAM D21 ecosystem is well established, so there are many reference designs, libraries, and board support options for development. Its 1.62 V to 3.6 V supply range also makes it easy to integrate into a wide range of low-voltage systems.

Applications

Getting Started

A common starting point is a SAM D21-based development board such as the Arduino Zero or a Microchip Xplained Pro board, which provides a ready-made debug and programming path. Development is typically done with Microchip Studio or the Arduino ecosystem, depending on whether you want low-level control or faster prototyping. For custom hardware, plan for proper decoupling, a stable clock source if your design requires USB robustness, and access to SWD programming pins for bring-up.

Dev Boards

Development boards and breakout modules featuring the ATSAMD21G18A-MUT or compatible chips — ready to use for prototyping.

Seeed Studio XIAO SAMD21 Seeed Technology Co., Ltd

ATSAMD21G18 XIAO SAMD21 SAM D ARM® Cortex®-M0 MCU 32-Bit Embedded Evaluation Board

Digi-Key 509 in stock

Seeed Studio XIAO SAMD21 Seeed Technology Co., Ltd

ATSAMD21G18 XIAO SAMD21 SAM D ARM® Cortex®-M0+ MCU 32-Bit Embedded Evaluation Board

Digi-Key 4,149 in stock

Adafruit Feather M0 Express Adafruit Industries LLC

ATSAMD21G18 Feather M0 Express SAM D ARM® Cortex®-M0+ MCU 32-Bit Embedded Evaluation Board

Digi-Key Mouser 55 in stock

Arduino Nano 33 IoT Arduino

The Arduino Nano 33 IoT (ABX00027) is an advanced evaluation platform designed for IoT applications, featuring the 32 bi

Digi-Key Mouser 800 in stock

ATSAMD21G18A Microchip Technology

ARM Cortex-M0+ MCU with strong Arduino and low-power application support, useful for single-core embedded designs.

Digi-Key Mouser 2,131 in stock

ATSAMD21G Family

Comparing specs that differ across variants. The current part is highlighted.

Also Consider

ATSAMD21G18A-AU MCHPMicrochip Technology - Same MCU family and core, but in a more common 48-pin TQFP package that is often easier to prototype and assemble.

ATSAMD21G18A-MU MCHPMicrochip Technology - Very close alternative in the same family and package class, useful if you want the same capability in a different package option.

STM32G031K8T6 STMicroelectronics - A comparable low-cost 32-bit MCU for designs that need a modern Cortex-M0+ class controller with broad ecosystem support.

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