Per the current webpage for this part, the SN74HCT74DR has NiPdAu and Sn finish. I searched our PCN archive and an online archive, but can't find a PCN that says Sn finish was added for this part.
Back in 2008 there was a PCN that said this part was made in Malaysia and had a gold finish. In 2011, another PCN said the same. Then there was PCN 20211220002.1, but this part was in Group 2 which only included changes to the Bond Wire, Mount Compound, and Mold Compound.
Which PCN announced the addition of the tin terminal finish? Could you provide a download link?
Thank you.
Bill