Can you tell me what the AB stands for on the EP2S30F484I4AB?

Hi,

For PN EPF10K100EBC356-1X, the letter 'X' is a optional letter at the end of a part number that specify certain device features. The 'X' here means PLLs in APEX™ and FLEX 10KE devices. This is also consider as a specific customer request devices.

Thank you.

Regards,

Aim