Parts SAM Microcontrollers Family SAMD21G SAMD21G18A

MCHPSAMD21G18A

Name: SAMD21G18A
Brand: Microchip

Microchip

Popular low-power 32-bit Cortex-M0+ MCU with broad ecosystem support for compact battery-powered applications.

Active1,743 in stock

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Overview

The SAMD21G18A is a low-power 32-bit ARM Cortex-M0+ microcontroller from Microchip running up to 48 MHz with 32 KB of RAM. It provides a flexible peripheral set including USB, multiple serial interfaces (I2C, SPI, USART), DMA, timers/PWM, brown-out and power-on reset, plus analog: 14x 12-bit ADC channels and one 10-bit DAC. The device comes in a 48-pin VFQFN package with exposed pad and is widely used in compact battery-powered applications.

Why Choose This Part

Practical reasons to choose the SAMD21G18A include a low-power ARM Cortex-M0+ core at 48 MHz with 32 KB of SRAM and a broad set of on-chip peripherals (USB, DMA, multiple serial ports, ADC/DAC). It is supported by a large ecosystem (Arduino cores, example code from Microchip/Atmel) and is available in a compact 48-pin VFQFN with an exposed pad for good thermal performance and board density.

Applications

Battery-powered sensor nodes

Low active and standby power plus integrated ADC/DAC and multiple comms interfaces make it suitable for battery-operated environmental or industrial sensors.

USB peripherals and HID devices

On-chip USB and plenty of GPIO allow implementation of USB device classes such as CDC, HID, or MIDI for custom USB accessories.

Wearables and handhelds

Compact package, low-power core and rich timers/PWM support make it a good fit for small wearable controllers and user interfaces.

IoT endpoints and gateways

Multiple serial interfaces and DMA simplify interfacing to radios, sensors, and external memory for edge endpoint applications.

Hobbyist and education platforms

Popular support in Arduino and community ecosystems makes it an easy choice for prototyping and teaching embedded systems.

Key Specifications

Speed 48MHz

RAM Size 32K x 8

Core Size 32-Bit

Peripherals Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT

Connectivity I2C, LINbus, SPI, UART/USART, USB

Mounting Type Surface Mount

Number of I/O 38

Core Processor ARM Cortex-M0+

Package / Case 48-VFQFN Exposed Pad

Data Converters A/D 14x12b; D/A 1x10b

Oscillator Type Internal

Program Memory Size 256KB (256K x 8)

Program Memory Type FLASH

Operating Temperature -40degC ~ 85degC (TA)

Supplier Device Package 48-QFN (7x7)

Voltage - Supply (Vcc/Vdd) 1.62V ~ 3.6V

Getting Started

Start development on a breakout or dev board that already uses the SAMD21G18A (for example, Arduino Zero, Adafruit Metro M0 or Feather M0) to avoid QFN soldering. Supported toolchains include Arduino IDE (SAMD core), Microchip Studio (Atmel Studio) and GCC ARM toolchains; debugging is typically done via SWD with tools like Atmel-ICE or Segger J-Link. Refer to Microchip application notes and example projects for peripheral setup and low-power modes.

Dev Boards

Development boards and breakout modules featuring the SAMD21G18A 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 3,141 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 364 in stock

Arduino Nano 33 IoT Arduino

The Arduino Nano 33 IoT with Headers (ABX00032) is a compact and versatile development board featuring the ARM® Cortex®-

Digi-Key Mouser 355 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 657 in stock

Part of SAM Microcontrollers family » SAMD21G

SAMD21G Family

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

Part Number	Package	Temp Range	Stock
SAMD21G18A (this part)	VFQFN-48	-40degC ~ 85degC (..	1,743
ATSAMD21G18A-AU (Microchip Technology)	TQFP-48	-40degC ~ 85degC (..	3,277
ATSAMD21G18A-AUT (Microchip Technology)	TQFP-48	-40degC ~ 85degC (..	4,963
ATSAMD21G18A-AFT (Microchip Technology)	TQFP-48	-40degC ~ 125degC ..	20,008
ATSAMD21G18A-MUT (Microchip Technology)	VFQFN-48	-40degC ~ 85degC (..	3,079
ATSAMD21G18A-MFT (Microchip Technology)	VFQFN-48	-40degC ~ 125degC ..	7,004
ATSAMD21G18A-AF (Microchip Technology)	TQFP-48	-40degC ~ 125degC ..	1,491