Would anyone be able to advise whether leads on cypress components are Matt tin over Nickel or over silver... or something else? The online data for S29AL016J70TFI020 (here https://www.cypress.com/part/s29al016j70tfi020 ) only specifies Matte tin, but in order to justify a tin whisker mitigation plan it is important to identify the barrier between the lead and the tin finish. Any pointers that help identify this would be greatly appreciated.
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The lead frame material of S29AL016J70TFI020 is Cu.
The alloy type of external plating of the Cu lead frame is Sn 100%, and the finish surface is matte.
In general, Cypress will perform whisker tests based on JESD22-A121 / JESD201, and confirm that the results meet the specifications.
Thanks and regards,