The SparkFun Thing Plus SAMD51 is a development board built around the ATSAMD51J20 — a 32-bit ARM Cortex-M4F microcontroller with floating point unit, running at up to 120 MHz. It offers substantial processing power in a compact, Feather-compatible form factor.

The board includes a Qwiic connector for solderless I2C peripherals, a 600 mA 3.3 V regulator, and a built-in LiPo charger for portable projects. It ships with a UF2 bootloader for drag-and-drop programming.

Key Features

• ATSAMD51J20 MCU – 32-bit ARM Cortex-M4F with FPU at up to 120 MHz
• 1 MB Flash / 256 KB SRAM – SRAM includes ECC for data integrity
• Feather Compatible – Standard form factor for ecosystem compatibility
• Qwiic Connector – Solderless I2C connection for sensors and peripherals
• LiPo Charger – Built-in charging circuit for lithium polymer batteries
• 600 mA 3.3 V Regulator – Stable power for the board and connected peripherals
• UF2 Bootloader – Drag-and-drop firmware flashing via USB
• Up to 6 SERCOM Interfaces – Flexible serial communication options

Specifications

• Microcontroller – ATSAMD51J20
• Architecture – 32-bit ARM Cortex-M4F
• Clock Speed – Up to 120 MHz
• Flash Memory – Up to 1 MB
• SRAM – Up to 256 KB (with ECC)
• Regulator – 3.3 V, 600 mA
• Interface – USB, Qwiic (I2C)

Ideal For

• IoT and connected device projects
• Data logging and sensor networks
• CircuitPython and Arduino development
• Portable battery-powered applications

Package Contents

• 1× SparkFun Thing Plus – SAMD51

Resources

• SAMD51 Thing Plus Hookup Guide