I would like to know what is the difference between 5SGXMA5N2F45C1GAC vs 5SGXMA5N2F45C1G , what is the ending AC refers to ? are they alternatives ? could you share the datasheet ?
They are both Intel Stratix V FPGAs. They are identical. You can refer to links below for your reference.
1. Stratix V Device Overview: https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/stratix-v/stx5_51001.pdf