arduino › microcontroller board
arduino Arduino UNO R4 Minima
Drop-in UNO R3 replacement on a modern 32-bit Renesas core. 5V logic is preserved so legacy shields work, but the MCU is internally 3.3V — VCC pin still says 5V to the shield world.
Specifications
- mcu chip
- renesas_ra4m1
- clock mhz
- 48
- flash kb
- 256
- sram kb
- 32
- wifi
- no
- wifi band
- none
- bluetooth
- none
- usb
- type_c
- gpio count
- 14
- analog inputs
- 6
- pwm pins
- 6
- i2c
- yes
- spi
- yes
- uart count
- 2
- operating voltage v
- 5
- input voltage range v
- 6-24
- power pins
- 5v, 3v3, vin
- firmware compat
- arduino_ide, platformio
- ai accelerator
- none
- form factor
- uno
Sources
- SparkFun open product catalog · ingest 2026-05-06
- Adafruit open product catalog · ingest 2026-05-06
- Arduino official product database · ingest 2026-05-06