Digikey is showing this part as available:
The “FGA” (vs “FGGA”) in the part appears to mean non-RoHS (i.e. leaded) solder balls. Xilinx documentation isn’t clear on whether that is a valid option for Spartan-7, but FGGA definitely is the RoHS option. Most of these parts at DigiKey are FGGA, but this one part is in stock and is FGA.
But … the description farther down says it is RoHS3 (just like the FGGA part).
Can you confirm that the XC7S50-1FGA484I is a leaded part?
Thanks.