TECHNET Archives

December 2004

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
"Jack C. Olson" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Jack C. Olson
Date:
Mon, 6 Dec 2004 10:30:45 -0600
Content-Type:
text/plain
Parts/Attachments:
text/plain (32 lines)
The amount of gold on an "Immersion" plated board
is only a few microinches think, usually less than 10.
When you solder a component to that surface, some
or all of the gold (depending on how long the solder
stays heated/melted) mixes in with the solder joint.
If the percentage of gold in the solder joint is high
enough the joint will be brittle, but it won't be that
high with such a thin immersion finish.

Trying to solder to a thick electroplated gold surface
is a different story, however, but you can calculate it
yourself by comparing the thickness of gold plating
with the amount of solder paste you are applying to
the lands in question. I can't remember the exact
percentage that means you are getting into the "danger
zone", but someone here will know it, or you can search
the TechNet archives at:
http://listserv.ipc.org/archives/technet.html

good luck,
Jack

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------

ATOM RSS1 RSS2