The Arduino UNO R3 SMD is a popular and versatile microcontroller board based on the ATmega328P microcontroller. The SMD (Surface-Mount Device) version features the ATmega328P microcontroller in an SMD package, offering the same functionality as the traditional UNO R3 but with a more compact design. It is widely used for a variety of projects, from simple experiments to complex prototypes.

Microcontroller: ATmega328P in SMD package Operating Voltage: 5V Input Voltage (recommended): 7-12V Digital I/O Pins: 14 (of which 6 provide PWM output) Analog Input Pins: 6 Flash Memory: 32 KB (ATmega328P) of which 0.5 KB used by bootloader SRAM: 2 KB (ATmega328P) EEPROM: 1 KB (ATmega328P) Clock Speed: 16 MHz USB Connection: Standard USB-B for programming and communication Power Jack: 2.1mm center-positive barrel jack ICSP Header: For in-circuit programming Reset Button: For easy reset of the microcontroller