TI UC3854DWTR-F Suffix Meaning

If you search the part number UC3854DWTR from TI on the Digi-Key website, you may see another similar part number, UC3854DWTR-F. What is the difference between these two part numbers?

Confirmed by TI, the difference is the UCC3854 incorporates a Plasma Cleaning Process as part of the manufacturing process, but the UCC3854-F does not.