The Arduino UNO R4 Minima is the first UNO board featuring a 32-bit microcontroller, the RA4M1 from Renesas. It is faster, has more memory and has a number of built-in features such as a DAC, RTC and HID. The UNO R4 Minima is a 5 V only board.

The UNO R4 Minima features a microcontroller based on the Renesas RA4M1 (Arm® Cortex®-M4) with an operating voltage of 5 V. It has 14 digital I/O, 6 analog inputs with up to 14-bit resolution, a clock speed of 48 MHz, and 32 kB SRAM, 256 kB flash memory & 8 kB of EEPROM.

It features a DAC for audio projects, RTC for accurate time tracking and HID for emulating a keyboard/mouse. The barrel jack plug (VIN) supports voltages at up to 24V, making it compatible with common higher voltage adapters.