A is an improved version of the original model, and PW often stands for wide-body patch package. For example, SN74LVC138APW, SN74LVC07APW, SN74LVC244APW, SN74HC573APW, are all TSSOP packages, and the horizontal size is wider than the SOIC package.
However, the suffix rules of each manufacturer may be different, so there may be other meanings, the most reliable way is to determine according to the device manufacturer's data manual.