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CD4541B-MIL: 3A meaning in part number

Part Number: CD4541B-MIL

Can you tell me what is the difference between a  CD4541BF   and a CD4541BF3A ?

I cannot find any distinguishing information on web or datasheet, so must be an internal distinction in TI archives.

Can you investigate this and let me know what the "3A" means ?