The Uno R3 SMD is a budget alternative to the Arduino Uno Boards. It is equipped with an ATMEL AVR ATmega328P microcontroller and a updated USB-controller for cost reduction. The specifications are equal to Arduino Uno R3.

Special SMD Version:

Because Atmel is moving more and more of their production capacity to surface mount ICs, the DIP packaged ATmega is becoming more and more difficult to get. To keep up with demand, we now offer the Arduino Uno R3 with an SMD ATmega. The board is identical to the PTH version of the Uno, but you won't be able to remove the ATmega without some hot-air. This change shouldn't affect most users. Besides - when was the last time you managed to destroy an ATmega and needed to repair an Arduino board? Those things are nearly indestructible.