TPS74801: what difference between TPS74801DRCR and TPS74801DRCRG4

Hi Jim, 

These are the same material. Originally the G4 designator was there to indicate LEAD-FREE and Green (RoHS & no Sb/Br), however now both materials are the same. We've kept both orderable part numbers so we don't cause issues for customers who qualified one or the other part numbers.