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Adafruit Feather M4 Express - Featuring ATSAMD51 - ATSAMD51 Cortex M4

Adafruit Feather M4 Express - Featuring ATSAMD51 - ATSAMD51 Cortex M4

We have ✅ 4 available of the AF-3857 in our Sydney warehouse. An extra 100 units available with a short lead time.

Express post delivery (2-5 business days)

The Feather M4 Express is built around the ATSAMD51J19, a 120 MHz Cortex M4 processor with hardware floating point and DSP instructions, 512 KB flash, and 192 KB RAM. It ships with CircuitPython pre-loaded — plug it in and it appears as a small USB drive with main.py ready to edit. No installs, IDE, or compiler needed.

The board includes 2 MB SPI flash for storing CircuitPython scripts and libraries (or Arduino data files), a Mini NeoPixel, a prototyping area, and the UF2 drag-and-drop bootloader. It works with the Arduino IDE as well, and is compatible with all FeatherWings.

Key Features

  • ATSAMD51J19 Processor – 120 MHz Cortex M4 with hardware floating point and DSP, 3.3V logic
  • 512 KB Flash + 192 KB RAM – Substantial memory for complex applications
  • 2 MB SPI Flash – On-board file storage for CircuitPython scripts or Arduino data logging
  • CircuitPython Pre-loaded – Edit code directly on the USB drive, works on any computer
  • UF2 Bootloader – Drag-and-drop firmware loading; compatible with CircuitPython and Arduino IDE
  • Native USB – Built-in USB with bootloader and serial port debugging
  • Hardware Crypto – AES-256, true RNG, and public key controller
  • 21 GPIO Pins – 6× hardware SERCOM (SPI, I2C, Serial), 16× PWM, I2S input/output, 8-bit parallel capture
  • Analogue I/O – 2× 12-bit 1 MSPS DAC (stereo audio capable) and 2× 12-bit 1 MSPS ADC (6 analogue pins)
  • Mini NeoPixel – On-board addressable RGB LED
  • LiPo Battery Support – JST connector with built-in 100 mA charger and charging status LED
  • 32.768 kHz Crystal – For accurate clock generation and RTC
  • Prototyping Area – Small grid of through-holes for custom circuitry
  • Compact Design – 51 mm × 23 mm × 8 mm, weighing 5 g

Also Available

Ideal For

  • High-performance CircuitPython and Arduino development
  • Audio processing with dual 12-bit DACs
  • Portable battery-powered projects
  • Rapid prototyping with drag-and-drop programming

Package Contents

  • 1× Feather M4 Express (ATSAMD51)
  • 1× Header pin set
Note: LiPo battery and USB cable sold separately.

The Adafruit Feather M4 Express - Featuring ATSAMD51 - ATSAMD51 Cortex M4 appears in the following collections:

SKU AF-3857
by Adafruit