Hi, Steve,

I've had a number of ENIG boards made, and they don't look THAT rough.
Looks like someone's run a blunt drill through the board very fast.

Problems? - apart from "Are the holes cleaned and conditioned properly for
plating in the first place?":
Ductility of the copper, or at least its ability to stretch as much as it
could in the Z, perhaps.
Reliability of interconnection between layers?
Local delam behind the plating if the drill  did have a rough ride?
Dunno.

Do you have any test coupons exhibiting the same phenomenon to cross
section?

Peter Duncan




                    "Stephen R.
                    Gregory"             To:     [log in to unmask]
                    <SteveZeva@AO        cc:     (bcc: DUNCAN Peter/Asst Prin Engr/ST
                    L.COM>               Aero/ST Group)
                    Sent by:             Subject:     [TN] Rough PTH barrel walls in ENIG
                    TechNet              plated PCB...
                    <[log in to unmask]
                    ORG>


                    11/21/01
                    06:38 AM
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Hi all!

Just recieved a bare fab that I noticed some very rough walls of the
barrels of the PTH's. This is a ENIG plated PCB by the way. The roughness
seems worse in the smaller diameter holes than do the larger holes. Go to:

http://www.stevezeva.homestead.com/

and look at the two pics titled "rough walls"...

Didn't see any real voids, or fibers protruding...just maybe this is the
way ENIG  always plates, and it's just the way it always looks down inside
holes, I've never noticed it being this rough before...See any problems?

Thanks!

-Steve Gregory-



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