I have been download footprint of ic XC7A15T-1FTG256C from Ultra Librarian. Then i got 3 type of foodprint names FTG256_XIL, FTG256_XIL-M and FTG256_XIL-L. All of this have the same dimensions, what is differens? Thanks
Maybe the answer is the same as for this question?
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I got it, thank you.
You question is best asked of Ultra Librarian. Whichever you choose, make sure that footprint conforms to the manufacturers data sheet before using.
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This is the key. With IC’s and components offering so many packaging options one has to scrutinize each footprint comparing it with the datasheet of the component you are planning on using.
Years ago I had many PCB’s designed by a design house. When given a project they would ALWAYS create a new footprint for every component in that design. Those footprints became part of the design. We never had issues with a footprint error that I can recall.
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