This is actually how a copper plated barrel looks.  Some what rough
drilling, but not an issue unless there are voids in the plating.
Immersion coating like tin and silver are thin and will represent the
barrel topography.  Solder levels the barrel and masks the topography of
the walls.  

Jeffrey Bush
Director, Quality Assurance and Technical Support

VERMONT CIRCUITS INCORPORATED
  76 Technology Drive - POB 1890
    Brattleboro, Vermont 05302
      Voice: 802.257.4571.21 Fax: 802.257.0011
           http://www.vtcircuits.com
 

-----Original Message-----
From: Matthew Lamkin [mailto:[log in to unmask]] 
Sent: Monday, January 24, 2005 6:44 AM
To: [log in to unmask]
Subject: [TN] Silver plated barrel? does it reduce current carrying
ability?

I have just noticed the barrels on some boards that we now get silver
plated instead of tin plated so as to be lead free.

I can clearly see the laminate strands through this hole and many others
on the boards.

What difference is this from an ordinary tin plated hole?
looking at older boards, I can see nice shiny & flat holes & no ridges.

Is there something wrong with the holes that have been silver plated or
would they look like this anyway?

What impact does this have on the current carrying ability of a plated
hole?

I have managed to get a picture taken of one hole to indicate what I'm
on about.

http://www.ukxboxgamers.co.uk/BARRELL.jpg

Thankyou,
Matthew Lamkin.

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