Daan,

    It is my understanding that FLASH gold plating is permitted on NON
Plated PTH.   However, HARD Gold is NOT as it can not come in contact with
tin lead solder.   A galvanic reaction will occur.

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of d. terstegge
Sent: Thursday, February 05, 2004 9:13 AM
To: [log in to unmask]
Subject: [TN] Goldresidues in non-plated holes


Hi Technet,

I looked at an ENIG board today and noticed it had some gold-residues in the
nonplated holes. I always thought that a non-plated hole should not have any
plating at all, but seeing this condition for the second time (the first
time was on a board from another manufacturer and another designer) I almost
begin to think this is a normal condition. What do you think, is this
normal, is it acceptable (I don't think so), any idea what causes it ? For
those who like to see a photograph of this, see:
http://www.smtinfo.net/forum/index.php?showtopic=40

Daan Terstegge
Thales Communications
Unclassified mail
Personal Website: http://www.smtinfo.net

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