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Linux SBC · SBC
Radxa ZERO 3W
A compact Linux SBC with wireless networking and a 40-pin GPIO header intended to work with many SBC accessories.
Processor
Rockchip RK3566
Logic
3.3 V GPIO
Power
USB-C, 5 V header rail
Format
Tiny SBC with 40-pin header
Check before wiring
- Pi accessory compatibility depends on the signal and software stack.
- Radxa notes extra pull-ups on pins 3, 5, 27, and 28.
Interfaces
GPIOI2CSPIUARTPWMUSBWi-FiBluetooth
Source-backed connector
Interactive pin map
Pin map
Connector
40-pin GPIO header
Component side up, 40-pin GPIO header along the top edge
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.
- Official Radxa ZERO 3 hardware-interface table.
- GPIO maximum is 3.63 V; use 3.3 V logic peripherals.
- Pins 3, 5, 27, and 28 have extra pull-ups; pins 27 and 28 can be affected by USB2 resistor rework.
All 40 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | Power | 3V3 | ||
| 3 | UART | UART | UART3_RX | |
| 5 | UART | UART | UART3_TX | |
| 7 | PWM | PWM14 | ||
| 9 | Ground | GND | ||
| 11 | GPIO | |||
| 13 | Alt | I2S3_MCLK | ||
| 15 | GPIO | |||
| 17 | Power | 3V3 | ||
| 19 | SPI | SPI | SPI3_MOSI | |
| 21 | SPI | SPI | SPI3_MISO | |
| 23 | SPI | SPI | SPI3_CLK | |
| 25 | Ground | GND | ||
| 27 | I2C | I2C | I2C4_SDA | |
| 29 | I2C | I2C | I2C5_SCL | |
| 31 | I2C | I2C | I2C5_SDA | |
| 33 | UART | UART | UART5_RX | |
| 35 | Alt | I2S3_LRCK | ||
| 37 | GPIO | |||
| 39 | Ground | GND | ||
| 2 | Power | 5V | ||
| 4 | Power | 5V | ||
| 6 | Ground | GND | ||
| 8 | UART | UART | UART2_TX | |
| 10 | UART | UART | UART2_RX | |
| 12 | Alt | I2S3_SCLK | ||
| 14 | Ground | GND | ||
| 16 | UART | UART | UART4_RX / PWM8 | |
| 18 | UART | UART | UART4_TX / PWM9 | |
| 20 | Ground | GND | ||
| 22 | GPIO | |||
| 24 | SPI | SPI | SPI3_CS0 | |
| 26 | Reserved | |||
| 28 | I2C | I2C | I2C4_SCL | |
| 30 | Ground | GND | ||
| 32 | UART | UART | UART5_TX | |
| 34 | Ground | GND | ||
| 36 | GPIO | |||
| 38 | Alt | I2S3_SDI | ||
| 40 | Alt | I2S3_SDO |
Why it matters
- Small-board alternative when Pi-style accessory compatibility matters.
- Radxa docs include a full 40-pin function table.
- Useful for Linux projects that need more CPU than a microcontroller.
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