Leadframes Suspected to be Oxidized and Corroded

[Barley_Li]

Sometimes you may find some parts with suspect-looking leadframes. These leadframes seem to be oxidized and corroded. One example is TI’s SN74LS08N; some customers may receive this part and worry that it’s oxidized and cannot be used, as seen below.

In fact, TI has decided to change from a non-roughened leadframe to a single-side roughened leadframe for some of its parts. For this reason, these devices look as if they have been corroded. Roughened leadframes are an improvement to older leadframe technology and provide improved solder adhesion.

[PaulHutch]

Thanks for the info, I haven’t encountered this finish yet, now I know not to worry about the look.

Here’s a patent related to about this topic that gives a bit of background about why they would switch to roughened leadframes.
http://www.freepatentsonline.com/8963300.html