I know there are different revisions of the Arduino Uno itself, but are there any revisions of the SMD? If they are is SMD R2 identical to through-hole R2? I have a board marked R2 SMD and I am wondering if that is the only version that they produced in SMD format and just are signifying that it is compatible with the standard R2.
asked Feb 19 '14 at 22:11
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I have a R3 SMD uno, if that helps – TheDoctor Feb 19 '14 at 22:26
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@TheDoctor I don't think there is an R3 SMD. The R2, R3 are for the DIP boards. The only SMD board is the "Uno SMD" – sachleen Feb 19 '14 at 22:56
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@sachleen - Yep i do - see my answer below – TheDoctor Feb 19 '14 at 23:16
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The only difference with the SMD Uno is the fact you can't remove the chip. There are also 2 extra analog comparators not connected to anything.
The SMD boards are compatible with the thru-hole boards, but they have SMD components, which apparently make them easier to make and cheaper. As I said before, the two extra analog inputs (A7 and A6) are left unconnected on the official boards.
Here is my Uno R3:
