Parts Automotive Automotive Microcontrollers SAM Microcontrollers Family SAMD21G ATSAMD21G18A-AFT

MCHPATSAMD21G18A-AFT

Name: ATSAMD21G18A-AFT
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)

Active20,008 in stock

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Overview

The ATSAMD21G18A-AFT is a Microchip ARM Cortex-M0+ 32-bit microcontroller running up to 48 MHz with 256 KB of flash and 32 KB of RAM in a 48-TQFP package. This variant is offered as a functional-safety (FuSa) oriented device and provides a broad set of on-chip peripherals including USB, I2C, SPI, UART/LIN, I2S and multiple timers. It operates from 1.62 V to 3.6 V and exposes around 38 general purpose I/O pins.

Why Choose This Part

Large on-chip flash (256 KB) and 32 KB of RAM provide headroom for feature-rich firmware while the Cortex-M0+ core keeps power consumption modest. The device integrates a wide range of peripherals (USB, LIN, I2S, SPI, I2C, USART, DMA, PWMs and watchdogs) which reduces external component count. The FuSa-designated variant targets safety-conscious applications where additional development controls and diagnostics are desired. Strong ecosystem support (Microchip toolchains and Arduino-compatible boards) simplifies development.

Applications

Automotive body and gateway controllers

LIN support and the functional-safety variant make it suitable for low- to mid-complexity automotive nodes and gateways.

Safety-critical industrial controllers

Use in industrial control or safety-monitoring functions where FuSa features and deterministic MCU behavior are required.

USB peripherals and human interfaces

On-chip USB plus ample I/O and timers make it a good fit for USB devices, HID or simple HMI panels.

Prototyping and Arduino-compatible designs

Same core MCU used on Arduino Zero-style boards for rapid prototyping and education.

Sensor hubs and data acquisition

DMA, multiple serial interfaces and low-power modes suit aggregation of sensors and intermediate processing.

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 ~ 125degC (TA)

Supplier Device Package 48-TQFP (7x7)

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

Getting Started

Start with a SAM D21 evaluation or development board such as Microchip/Atmel SAM D21 Xplained Pro or Arduino Zero / Feather M0 form-factor boards that use the SAMD21G18A. Development can be done with Microchip Studio (Atmel Studio), ARM GCC toolchain with CMSIS, or the Arduino IDE for board-level prototyping; use a hardware debugger like Atmel-ICE or SEGGER J-Link for SWD debug. Reference examples and middleware are available from Microchip ASF/CMSIS and community Arduino libraries.

Dev Boards

Development boards and breakout modules featuring the ATSAMD21G18A-AFT 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
ATSAMD21G18A-AFT (this part)	TQFP-48	-40degC ~ 125degC ..	20,008
ATSAMD21G18A-AU	TQFP-48	-40degC ~ 85degC (..	3,277
ATSAMD21G18A-AUT	TQFP-48	-40degC ~ 85degC (..	4,963
ATSAMD21G18A-MU	VFQFN-48	-40degC ~ 85degC (..	1,624
ATSAMD21G18A-MUT	VFQFN-48	-40degC ~ 85degC (..	3,079
ATSAMD21G18A-MFT	VFQFN-48	-40degC ~ 125degC ..	7,004
ATSAMD21G18A-AF	TQFP-48	-40degC ~ 125degC ..	1,491