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Where are the datasheets for obsolete parts? ( PT79SR152HC)

I am a student, who likes to tinker.  Part of that involves salvaging parts, and a lot of them.  One part I would like to play with is the PT79SR152HC.  There is no datasheet available.  While I could reverse engineer it (which would be good practice), it would be more useful to have a datasheet, and or product page.  The benefit to having a product page for obsolete parts would be to show a suitable replacement, either for repair or new design.

Cheers.