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PTH12050W: PTH12050WAD and PTH12050WAH

Part Number: PTH12050W

If the POLA Regulator parts PTH12050WAD and PTH12050WAH are now mechanically and electrically "equivalent' why does TI still offer both options ? Producing both versions must have a cost associated. Is there an advantage to offering both of these versions?  I understand that up until 2006 the PTH12050WAH was non-RoHS, after  it was updated to become RoHS certified, both parts are now the same?