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ATSAMD21E18A-AFT

MCHPATSAMD21E18A-AFT

Microchip Technology
ARM® Cortex®-M0+ SAM D21E, Functional Safety (FuSa) Microcontroller IC 32-Bit 48MHz 256KB (256K x 8) FLASH 32-TQFP (7x7)
Active11,484 in stock
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Overview

The ATSAMD21E18A-AFT is a 32-bit ARM Cortex-M0+ microcontroller featuring 256KB of flash and 32KB of SRAM in a compact 32-pin TQFP package. Part of the SAM D21 series, it is specifically designed for functional safety (FuSa) applications and operates at frequencies up to 48MHz. It includes a versatile peripheral set such as a full-speed USB 2.0 interface and Serial Communication Modules (SERCOM) that can be configured as I2C, SPI, or UART.

Why Choose This Part

This variant provides a high memory density for its small 32-pin footprint, offering 256KB of flash for complex software stacks. The flexible SERCOM modules simplify PCB routing by allowing pins to be multiplexed for various serial protocols. Additionally, its native USB support eliminates the need for external crystal oscillators in many configurations, reducing BOM cost and board space.

Applications

Functional Safety Controllers
Utilized in industrial systems requiring FuSa compliance for monitoring and control tasks.
USB Peripherals
Ideal for creating compact USB-to-serial bridges, custom HID devices, or low-power PC accessories.
Industrial Sensor Nodes
Acts as a low-power processing hub for I2C and SPI sensors with localized data logging in the 256KB flash.
Automotive LIN Subsystems
Suitable for non-safety-critical automotive interior controls and LINbus communication nodes.

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 26
Core Processor ARM Cortex-M0+
Package / Case 32-TQFP
Data Converters A/D 10x12b; 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 32-TQFP (7x7)
Voltage - Supply (Vcc/Vdd) 1.62V ~ 3.6V

Getting Started

Engineers can begin development using the Atmel-ICE or SAM-ICE hardware programmers and the Microchip Studio (formerly Atmel Studio) or MPLAB X IDE. The SAM D21 Curiosity Nano evaluation kit provides a low-cost entry point for hardware prototyping. For software development, the Microchip Harmony 3 framework or Advanced Software Framework (ASF) provides drivers for USB, DMA, and serial communication.

Dev Boards

Development boards and breakout modules featuring the ATSAMD21E18A-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
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
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 » SAMD21E

SAMD21E Family

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

Part Number RAM Package Flash Temp Range Stock
ATSAMD21E18A-AFT (this part) 32K TQFP-32 256KB -40degC ~ 125degC .. 11,484
ATSAMD21E18A-MUT 32K VFQFN-32 256KB -40degC ~ 85degC (.. 24,578
ATSAMD21E18A-AUT 32K TQFP-32 256KB -40degC ~ 85degC (.. 11,120
ATSAMD21E15B-AFT 4K TQFP-32 32KB -40degC ~ 125degC .. 2,970
ATSAMD21E18A-AU (Microchip) 32K TQFP-32 256KB -40degC ~ 85degC (.. 1,742
ATSAMD21E17A-AUT 16K TQFP-32 128KB -40degC ~ 85degC (.. 2,730
Also available as: ATSAMD21E17D-MZVAO, ATSAMD21E16B-AZVAO, ATSAMD21E18A-AZVAO, ATSAMD21E17D-AZVAO, ATSAMD21E18A-MZVAO, ATSAMD21E15B-MFT

Also Consider

ATSAMD21G18A-AUT MCHPMicrochip Technology - Provides more I/O pins in a 48-TQFP package while maintaining the same 256KB flash and 48MHz Cortex-M0+ core.
STM32L072CZT6 STMicroelectronics - Alternative ultra-low-power ARM Cortex-M0+ MCU with similar flash and RAM specifications and integrated USB support.