Loading source-backed pinouts…
Microcontroller
Adafruit Feather M4 Express
A fast SAMD51 Feather with battery charging and QSPI flash, popular for CircuitPython and Arduino projects that need more speed than M0 boards.
Processor
Microchip ATSAMD51J19 Arm Cortex-M4F
Logic
3.3 V GPIO
Power
Micro-USB, Li-Po connector, USB/3V rail
Format
Feather module
Check before wiring
- GPIO is 3.3 V only.
- Feather BAT/USB/3V rails have distinct current and charging limits.
- DAC and analog pins should be checked against the Adafruit pinout before wiring.
Interfaces
GPIOI2CSPIUARTADCDACPWMUSB
Source-backed connector
Interactive pin map
Pin map
Connector
Feather 16+12 headers
USB at top, JST battery at top-left, component side up
Simplified technical illustration. Pin data is source-backed; verify against the linked documentation before wiring.
Hover, tap, or focus a pad to inspect a pin. Use arrow keys to move between pins.
- Standard Adafruit Feather form factor; SAMD51J19 ports from the official PrettyPins PDF.
- All logic is 3.3 V and is not 5 V tolerant.
- A0 (PA02) and A1 (PA05) are true analog DAC outputs; A2-A5 are analog inputs.
- Left header positions 1-16, right header positions 17-28 (continuing around the board).
All 28 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | System | |||
| 2 | Power | 3V3 | ||
| 3 | Alt | analog reference, max 3.3 V | ||
| 4 | Ground | GND | ||
| 5 | DAC | PA02 · true DAC output (VOUT0) | ||
| 6 | DAC | PA05 · true DAC output (VOUT1) | ||
| 7 | ADC | PB08 | ||
| 8 | ADC | PB09 | ||
| 9 | ADC | PA04 | ||
| 10 | ADC | PA06 | ||
| 11 | SPI | SPI | PA17 | |
| 12 | SPI | SPI | PB23 | |
| 13 | SPI | SPI | PB22 | |
| 14 | UART | UART | PB17 | |
| 15 | UART | UART | PB16 | |
| 16 | GPIO | PA14 | ||
| 17 | Power | BAT | LiPo battery input | |
| 18 | System | 3.3 V regulator enable | ||
| 19 | Power | USB | USB 5 V | |
| 20 | GPIO | PA23 · onboard red LED | ||
| 21 | GPIO | PA22 | ||
| 22 | GPIO | PA21 | ||
| 23 | GPIO | PA20 | ||
| 24 | GPIO | PA19 | ||
| 25 | GPIO | PA18 | ||
| 26 | GPIO | PA16 | ||
| 27 | I2C | I2C | PA13 | |
| 28 | I2C | I2C | PA12 |
Why it matters
- FeatherWing ecosystem compatibility with official pinout docs.
- QSPI flash supports CircuitPython filesystems.
- SAMD51 performance is strong for audio, display, and control projects.
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