Atmel SAM D21 ARM Cortex-M0+ processor with USB

Atmel’s SAM D21 ARM Cortex-M0+ processor is upwards compatible from the SAM D20 and adds features such as full-speed USB, DMA and high-end timers/counters.

Low Power – peripherals can communicate without involving the CPU
Software-configurable serial communication module to handle I2C, USART/UART and SPI communications
8-channel DMA controller supporting both memory and peripheral data transfers
Full-Speed USB —both USB embedded Host and USB Device modes supported

SAM D21ARM Cortex-M0+ processor with USB

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Product Description

Atmel’s SAM D21 ARM Cortex-M0+ processor is upwards compatible from the SAM D20 and adds features such as full-speed USB, DMA and high-end timers/counters.

The SAM D family is designed for easy migration within the Atmel MCU portfolio. It consists of four pin- and code-compatible product series and a total of 35 different microcontrollers.

They all use the same processor, bus matrix, interrupt system and other core features. The main variations between each family member are in pin counts, memories and peripheral mix.

It sets a new benchmark for flexibility and ease-of-use, while combining the performance and energy efficiency of an ARM Cortex-M0+ based MCU with an optimised architecture and peripheral set.

Atmel | SMART SAM D products give you a truly differentiated general-purpose microcontroller that is ideal for many low-power, cost-sensitive industrial and consumer applications.

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Manufacturer Part No	Order Code	Manufacturer / Description	Availability	Price For	Price	Quantity	Product Range	Device Core	Data Bus Width	Operating Frequency Max	Program Memory Size	No. of Pins	IC Case / Package	No. of I/O's	Interfaces	RAM Memory Size	ADC Channels	ADC Resolution	Supply Voltage Min	Supply Voltage Max	Operating Temperature Min	Operating Temperature Max	IC Mounting	MCU Family	MCU Series	Qualification
ATSAMD21E17A-MU	2423712 Data Sheet + RoHS Date/Lot Code	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	497 in stock + Check Stock & Lead Times 497 in stock for next day delivery (UK stock) More stock available week commencing 22/12/25	Each	1+ £2.38 £2.86 25+ £2.16 £2.59 100+ £1.95 £2.34 490+ £1.91 £2.29	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	128KB	32Pins	QFN	26I/O's	I2C, LIN, SPI, USART	16KB	10Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21J16A-MU	2409251 Data Sheet + RoHS	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	No Longer Manufactured	Each	null	Restricted Item	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	64KB	64Pins	QFN	52I/O's	I2C, I2S, SPI, UART, USB	8KB	20Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21J18A-MU	2409254 + RoHS Date/Lot Code	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	613 in stock + Check Stock & Lead Times 613 in stock for next day delivery (UK stock) More stock available week commencing 15/12/25	Each	1+ £3.56 £4.27 25+ £3.24 £3.89 100+ £2.94 £3.53 250+ £2.88 £3.46	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	256KB	64Pins	QFN	52I/O's	I2C, I2S, SPI, UART, USB	32KB	20Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21G17A-AU	2423715 + RoHS Date/Lot Code	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	420 in stock + Check Stock & Lead Times 420 in stock for next day delivery (UK stock) More stock available week commencing 08/12/25	Each	1+ £2.18 £2.62 25+ £1.99 £2.39 100+ £1.80 £2.16 250+ £1.66 £1.99	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	128KB	48Pins	TQFP	38I/O's	I2C, LIN, SPI, USART	16KB	14Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21G16A-AU	2409246 + RoHS	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	No Longer Manufactured	Each	null	Restricted Item	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	64KB	48Pins	TQFP	38I/O's	I2C, I2S, SPI, UART, USB	8KB	14Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21E17A-AU	2423713 + RoHS Date/Lot Code	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	838 in stock + Check Stock & Lead Times 838 in stock for next day delivery (UK stock) More stock available week commencing 15/12/25	Each	1+ £2.31 £2.77 25+ £2.10 £2.52 100+ £1.92 £2.30 250+ £1.88 £2.26	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	128KB	32Pins	TQFP	26I/O's	I2C, LIN, SPI, USART	16KB	10Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21G18A-AU	2409248 Data Sheet + RoHS Date/Lot Code	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	22,190 in stock + Check Stock & Lead Times 22,190 in stock for next day delivery (UK stock) More stock available week commencing 08/12/25	Each	1+ £3.07 £3.68 25+ £2.79 £3.35 100+ £2.53 £3.04 250+ £2.48 £2.98	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	256KB	48Pins	TQFP	38I/O's	I2C, I2S, SPI, UART, USB	32KB	14Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21J16A-AU	2409250 Data Sheet + RoHS	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	No Longer Manufactured	Each	null	Restricted Item	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	64KB	64Pins	TQFP	52I/O's	I2C, I2S, SPI, UART, USB	8KB	20Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21J18A-AU	2409253 + RoHS Date/Lot Code	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	1,276 in stock + Check Stock & Lead Times 1,276 in stock for next day delivery (UK stock) More stock available week commencing 08/12/25	Each	1+ £3.64 £4.37 25+ £3.31 £3.97 100+ £2.98 £3.58 250+ £2.92 £3.50	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	256KB	64Pins	TQFP	52I/O's	I2C, I2S, SPI, UART, USB	32KB	20Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21J17A-AU	2423718 + RoHS Date/Lot Code	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	1,012 in stock + Check Stock & Lead Times 1,012 in stock for next day delivery (UK stock) More stock available week commencing 08/12/25	Each	1+ £2.55 £3.06 25+ £2.31 £2.77 100+ £2.27 £2.72 250+ £2.22 £2.66	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	128KB	64Pins	TQFP	52I/O's	I2C, LIN, SPI, USART	16KB	20Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21-XPRO	2407175 Data Sheet + RoHS	Evaluation Kit, SAM D21 ARM® Cortex®-M0+ MCU, Mechanical Buttons, On-Board Debugger MICROCHIP You previously purchased this product. View in Order History	9 in stock + Check Stock & Lead Times 9 in stock for next day delivery (UK stock) 4 more will be available week commencing 19/11/25 3 more will be available week commencing 17/12/25 13 more will be available week commencing 28/01/26 More stock available week commencing 16/02/26	Each	1+ £30.07 £36.08	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
ATSAMD21E18A-AU	2409244 Data Sheet + RoHS Date/Lot Code	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	1,318 in stock + Check Stock & Lead Times 1,318 in stock for next day delivery (UK stock) More stock available week commencing 15/12/25	Each	1+ £3.25 £3.90 25+ £2.93 £3.52 100+ £2.89 £3.47 250+ £2.85 £3.42	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	256KB	32Pins	TQFP	26I/O's	I2C, I2S, SPI, UART, USB	32KB	10Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21J17A-MU	2423717 + RoHS Date/Lot Code	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	No Longer Stocked	Each	null	Restricted Item	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	128KB	64Pins	QFN	52I/O's	I2C, LIN, SPI, USART	16KB	20Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21E16A-MU	2409243 Data Sheet + RoHS	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	No Longer Manufactured	Each	null	Restricted Item	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	64KB	32Pins	QFN	26I/O's	I2C, I2S, SPI, UART, USB	8KB	10Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21G16A-MU	2409247 Data Sheet + RoHS	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	No Longer Manufactured	Each	null	Restricted Item	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	64KB	48Pins	QFN	38I/O's	I2C, I2S, SPI, UART, USB	8KB	14Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21G17A-MU	2423714 + RoHS Date/Lot Code	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	44 in stock + Check Stock & Lead Times 44 in stock for next day delivery (UK stock) More stock available week commencing 15/12/25	Each	1+ £2.48 £2.98 25+ £2.27 £2.72 100+ £2.06 £2.47 416+ £2.02 £2.42	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	128KB	48Pins	QFN	38I/O's	I2C, LIN, SPI, USART	16KB	14Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21E16A-AU	2409242 Data Sheet + RoHS	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	No Longer Manufactured	Each	null	Restricted Item	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	64KB	32Pins	TQFP	26I/O's	I2C, I2S, SPI, UART, USB	8KB	10Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21E18A-MU	2409245 Data Sheet + RoHS	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	No Longer Stocked	Each	null	Restricted Item	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	256KB	32Pins	QFN	26I/O's	I2C, I2S, SPI, UART, USB	32KB	10Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-
ATSAMD21G18A-MU	2409249 + RoHS	ARM MCU, SAM D Series, SAM 32 Family SAM D21 Series Microcontrollers, ARM Cortex-M0+, 32 bit MICROCHIP You previously purchased this product. View in Order History	1,619 in stock + Check Stock & Lead Times 1,619 in stock for next day delivery (UK stock) More stock available week commencing 15/12/25	Each	1+ £3.38 £4.06 25+ £3.07 £3.68 100+ £2.78 £3.34 416+ £2.72 £3.26	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	SAM 32 Family SAM D21 Series Microcontrollers	ARM Cortex-M0+	32 bit	48MHz	256KB	48Pins	QFN	38I/O's	I2C, I2S, SPI, UART, USB	32KB	14Channels	12Bit	1.62V	3.63V	-40°C	85°C	Surface Mount	SAM32	SAM D2X	-