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ATSAMD21E18A-AU

MCHPATSAMD21E18A-AU

Microchip
Same SAM D21E device available in an alternate package (TQFP) for different board layout and prototyping needs.
Active1,742 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The ATSAMD21E18A-AU is a Microchip (Atmel) SAM D21 series 32-bit microcontroller based on an ARM Cortex-M0+ core running up to 48 MHz. It provides 256 KB flash, 32 KB RAM, about 26 general-purpose I/O and built-in peripherals including I2C, SPI, UART/USART, USB, DMA and I2S. The device supports a 1.62 V to 3.6 V supply range and includes common MCU features like brown-out detect, POR and a watchdog. This TQFP variant is intended for easier board layout and hand-prototyping compared with QFN packages.

Why Choose This Part

The ATSAMD21E18A-AU combines a familiar ARM Cortex-M0+ architecture with a usable balance of memory (256 KB flash, 32 KB RAM) for mid-size embedded applications. On-chip USB and plentiful serial interfaces simplify implementing host/device connectivity without external adapters. The TQFP package eases hand soldering and prototyping compared with QFN packages, and the wide supply voltage range makes it flexible for battery- and bus-powered designs.

Applications

USB peripherals
Implement USB device classes (CDC, HID, MSC) or simple USB-enabled instruments using the on-chip USB peripheral.
Sensor hub and datalogging
Collect and preprocess sensor data over I2C/SPI/UART and store or stream it, suitable for compact dataloggers or gateway endpoints.
Prototyping and development boards
TQFP package makes the part easier to solder and evaluate on breadboards or custom prototype PCBs for hardware validation and education.
Embedded audio / streaming
Use the I2S and DMA peripherals for low-latency audio data transfer in simple audio applications.
General-purpose control and PWM tasks
Motor control, LED drivers, and other real-time control tasks using timers, PWM and interrupt-driven I/O.

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 ~ 85degC (TA)
Supplier Device Package 32-TQFP (7x7)
Voltage - Supply (Vcc/Vdd) 1.62V ~ 3.6V

Getting Started

Get up and running with common SAM D21 evaluation boards and ecosystem examples such as SAM D21 Xplained Pro, Arduino Zero, or Adafruit Feather M0 as reference designs. Toolchains and flows commonly used include the Arduino IDE with the samd core, arm-none-eabi-gcc toolchains, and Microchip configuration tools or MPLAB X; debug/programming is typically via SWD with tools like Atmel-ICE or Segger J-Link and OpenOCD/GDB. Start by importing a peripheral example (USB, I2C, UART) and use the board pinout to map signals to the TQFP package on your prototype PCB.

Dev Boards

Development boards and breakout modules featuring the ATSAMD21E18A-AU 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 3,829 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
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
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-AU (this part) 32K TQFP-32 256KB -40degC ~ 85degC (.. 1,742
ATSAMD21E18A-MUT (Microchip Technology) 32K VFQFN-32 256KB -40degC ~ 85degC (.. 25,047
ATSAMD21E18A-AUT (Microchip Technology) 32K TQFP-32 256KB -40degC ~ 85degC (.. 11,120
ATSAMD21E18A-AFT (Microchip Technology) 32K TQFP-32 256KB -40degC ~ 125degC .. 11,484
ATSAMD21E15B-AFT (Microchip Technology) 4K TQFP-32 32KB -40degC ~ 125degC .. 2,970
ATSAMD21E17A-AUT (Microchip Technology) 16K TQFP-32 128KB -40degC ~ 85degC (.. 3,036
Also available as: ATSAMD21E17D-MZVAO, ATSAMD21E16B-AZVAO, ATSAMD21E18A-AZVAO, ATSAMD21E17D-AZVAO, ATSAMD21E18A-MZVAO, ATSAMD21E15B-MFT

Also Consider

ATSAMD21G18A-AU MCHPMicrochip - Same SAM D21 family in a G18A variant offering more I/O and pins in a TQFP package for expanded connectivity.
ATSAMD21G18A-MU MCHPMicrochip - Higher-pin-count SAM D21 device in a QFN package if board space or layout constraints prefer that form factor.
STM32F103C8T6 STMicroelectronics - Widely used ARM Cortex-M3 alternative with broad community and development-board support for similar-class embedded projects.

Categories

Microcontrollers > IoT & Wireless MCUs