Parts SAM Microcontrollers Family SAMD21G ATSAMD21G18A-AUT

MCHPATSAMD21G18A-AUT

Name: ATSAMD21G18A-AUT
Brand: Microchip Technology

Microchip Technology

ARM® Cortex®-M0+ SAM D21G, Functional Safety (FuSa) Microcontroller IC 32-Bit 48MHz 256KB (256K x 8) FLASH 48-TQFP (7x7)

Active2,675 in stock

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Overview

The ATSAMD21G18A-AUT is a Microchip ARM Cortex-M0+ 32-bit microcontroller running up to 48 MHz with 256 KB of flash and 32 KB of SRAM. It is a Functional Safety (FuSa) targeted variant of the SAM D21 family with a rich peripheral set including USB, I2C, SPI, UART/USART and LIN. The device supports a wide supply range (1.62 V to 3.6 V) and provides about 38 user I/O in a 48-pin TQFP package.

Why Choose This Part

This SAM D21G FuSa variant combines a familiar Cortex-M0+ architecture with a balanced mix of peripherals (including USB and LIN) and a mid-size 256 KB flash/32 KB RAM memory footprint for typical embedded applications. The part's functional safety focus and broad supply voltage range make it attractive where diagnostics and robustness matter, while wide toolchain and community support (Arduino ecosystem, GCC, vendor frameworks) speed development.

Applications

Functional-safety embedded controllers

Safety-critical control and monitoring functions in industrial or automotive systems where FuSa features and diagnostic capabilities are required.

USB-connected devices

USB-enabled peripherals such as data loggers, USB audio/control interfaces, HID devices, or firmware-updatable products.

Arduino-compatible development boards

Firmware and product development using Arduino Zero-style boards or custom PCBs that leverage existing SAMD21 Arduino ecosystem support.

Body electronics and LIN-connected modules

Automotive body control modules and subsystems that require LIN connectivity, UART/SPI peripherals and mid-size flash/RAM.

Battery-powered embedded products

Low-voltage battery-operated devices that benefit from the MCU's low-voltage operation range and sleep modes (typical for SAM D21 family).

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-TQFP

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-TQFP (7x7)

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

Getting Started

Common development options include the Microchip/SAM Xplained or SAMD21-based Arduino Zero boards for quick prototyping. Use Microchip Studio (Atmel Studio), the ARM GCC toolchain with vendor SDKs/ASF4, PlatformIO or the Arduino IDE for firmware development; debugging is supported via Atmel-ICE or SEGGER J-Link (and built-in EDBG on some dev boards). Check Microchip application notes and example projects for SAM D21 FuSa features and recommended safety guidance.

Dev Boards

Development boards and breakout modules featuring the ATSAMD21G18A-AUT 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 3,701 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 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
ATSAMD21G18A-AUT (this part)	TQFP-48	-40degC ~ 85degC (..	2,675
ATSAMD21G18A-AU	TQFP-48	-40degC ~ 85degC (..	4,920
ATSAMD21G18A-MU	VFQFN-48	-40degC ~ 85degC (..	1,624
ATSAMD21G18A-AFT	TQFP-48	-40degC ~ 125degC ..	26,091
ATSAMD21G18A-MUT	VFQFN-48	-40degC ~ 85degC (..	3,239
ATSAMD21G18A-MFT	VFQFN-48	-40degC ~ 125degC ..	7,011
ATSAMD21G18A-AF	TQFP-48	-40degC ~ 125degC ..	1,557

Also available as: ATSAMD21G18A-MZVAO, ATSAMD21G16B-AZVAO, ATSAMD21G17D-AZVAO, ATSAMD21G18A-MF

Also Consider

ATSAMD21G18A-MU MCHPMicrochip Technology - Same SAM D21G core and memory sizes offered in a different package option commonly used on compact PCBs.

ATSAMD21G18A-AU MCHPMicrochip Technology - Equivalent SAM D21G18A device available in an alternative package option for different assembly or footprint requirements.