Atmega32xx PCB footprints

[regimon]

Quick question but finding it difficult to get a definite answer; Are the footprints/ schematics the same for the atmega32u4 and the atmega32UC3B?

I'm wanting to build a design based on the atmega32U4 but can only find the OrCAD libraries for the atmega32UC3B. Does anyone have experience with the atmega32U4 or have an alternative footprint/ schematic that is identical.

Cheers, Reg.

[ajb]

I don't think there's any such thing as an ATMega32UC3B.  There's an AT32UC3B, but that's a 32-bit UC3, not an 8-bit AVR, let alone an ATMega.  If that's what you're talking about then the pinouts will certainly be different--they don't even have the same pin count!

Generally with AVRs the first number at the end indicates the flash memory size--so an ATMega32u4 should be the same as an ATMega16u4 except the former will have twice as much flash (and usually twice as much SRAM and EEPROM) as the latter.  Check the datasheets to be sure, though!

[regimon]

Yes sorry I was indeed referring to the AT32UC3B. Seem to have found the correct footprint on SnapEDA anyway.

Thanks for your help ajb