Jack,
Are you sure the boards you sent to the assembly vendor were immersion silver or could they have been immersion tin?

Regards,
George

George M. Wenger (908)-546-4531 
Reliability Engineer
RF Power Amplifier Group
Andrew Corporation,  40 Technology Drive, NJ 07059
[log in to unmask]



-----Original Message-----
From: Jack C. Olson [mailto:[log in to unmask]]
Sent: Friday, August 02, 2002 2:23 PM
To: [log in to unmask]
Subject: [TN] ASSY: Immersion Silver vs. Tin


Greetings,

A situation has come up that is beyond my experience.

We sent some Immersion Silver boards to an assembly
vendor and recieved an email saying:

"We are progressing on your boards. The bad news is
that the white tin flash used on the pads is awful.
The solder is reflowing irregularly, if at all.
We suspect that we'll have to touch every joint on
every part to make a good connection."

So my question to the group is:
Is there a difference from an assembly process point of view
between tin and silver?

I'm hoping the root problem is related to their assumption
that our silver boards were tin, but I don't know enough
about it.

Thanks in advance for any clues....

Jack

---------------------------------------------------------------------------------
Technet Mail List provided as a free 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/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------

---------------------------------------------------------------------------------
Technet Mail List provided as a free 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/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------