The SAMD51 or ATSAMD51 is an Arduino-compatible microcontroller chip with a 32-bit ARM® Cortex®-M4 processor. It runs off 3.3V power.

Here are a couple models:

• ATSAMD51N19A
• ATSAMD51J20A

It can be programmed with:

• C++
• MicroPython
• CircuitPython

Some boards that feature the SAMD51 include:

• Adafruit Neotrellis M4
• Adafruit PyPortal
• Adafruit Grand Central M4 Express without headers
• Adafruit Grand Central M4 Express with headers
• Adafruit TensorFlow Lite for Microcontrollers Kit
• Sparkfun Thing Plus

ATMEL ATSAMD51J20 Cortex M4 that clocks in at 120MHz and runs off 3.3V power. It comes with 1MB of built-in Flash storage and 256KB of RAM.