[SOLVED] Integrated Circuit leads with Scuff/scratches

[Stoshe]

I am not familiar with IC fabrication and manufacturing practices and was seeking information regarding IC pins with noticeable scuffs in the top portion of the lead. Is this a result of manufacturing process or is this a prior used DIP IC? I want to avoid relying on used parts or potentially duds. I do not see scuffs on the pins that would penetrate into board or socket which would be obvious to a prior use. Any advice on this would be appreciated. I attached a photo of IC with this scuffing/scratching affect.

 

[betwixt]

These are most likely to be from the machine that folds the pins. A used part would show wear on the narrower part of the pin,
The IC would be manufactured with the lead frame (all the pins stamped out of a flat sheet) flat, then the edges of the frame are cropped and the pins folded to the final angle.

Brian.

 

[ahsrabrifat]

No, these spots do not indicate previous usage.

 

[dick_freebird]

The wettable part of the pins looks fine. Machine
handling at test or lead-form most likely. The lead
finish looks unusual for mainstream, like this part
went through "solder dip"; most PDIPs I have
handled or seem, seem to be bright finish (pre-
molding, leadframes are plated; TI says they do
"solder plate" (85/15 Sn/Pb) and solder dip both.
Industry also has a lot of Ni-Pd plating.