Part Numbering - Texas Instrument - WAD, WAH Suffix

What does the suffix WAD and WAH call out and what are the differences in Texas Instrument parts?

The “WAD” suffix was originally the RoHS version of this device, and the “WAH” device was the standard lead containing part number. The “WAD” has a RoHS Conversion date of Aug. 2005. The “WAH” became RoHS on Dec. 2005. Both the WAH and WAD are DIP Module, ECP packages. Functionally, they are the same.