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August 2003

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Fri, 1 Aug 2003 08:10:56 -0400
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Bev,
What type of Pd?  Plated, evaporated, Pd/Ag?  The dissolution rate is Pd
process dependent (not all Pd are made equal).

jk

>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of
>Dave Hillman
>Sent: Thursday, July 31, 2003 3:51 PM
>To: [log in to unmask]
>Subject: Re: [TN] Thick Palladium on Leads
>
>
>Hi Bev! You need to be careful with the Pd thickness. When
>soldering to thick Pd plating layers you can potentially have
>problems with "Pd embrittlement" of the solder joint. Pd and
>Sn for an intermetallic phase
>(PdSn4) which behaves in the same fashion as the AuSn4
>intermetallic phase for gold embrittlement of solder joints.
>There are two industry reference I know of off the top of my
>head - the NCMS Surface Finishes Study and a Collins paper
>published at the 1996 SMI conference. If you keep the Pd
>thickness between 9-15 microinches you should be able avoid
>the PdSn4 phase with a controlled soldering processes. Also
>note that Pd has a very slow diffusion rate so you may have to
>adjust your soldering process times. Good Luck.
>
>Dave Hillman
>Rockwell Collins
>[log in to unmask]
>
>
>
>                      Bev Christian
>                      <[log in to unmask]        To:
>[log in to unmask]
>                      ET>                      cc:
>                      Sent by: TechNet         Subject:  [TN]
>Thick Palladium on Leads
>                      <TechNet@listserv
>                      .ipc.org>
>
>
>                      07/31/2003 12:28
>                      PM
>                      Please respond to
>                      "TechNet E-Mail
>                      Forum."; Please
>                      respond to Bev
>                      Christian
>
>
>
>
>
>
>Technetters,
>I have searched the archives and all I have been able to find
>is one informative e-mail from Phil Hinton from August 22,
>1998.  Has anyone every run across palladium as a thick
>undercoat?  if so, what, if any, grief did it cost you?
>
>regards,
>Bev Christian
>Research in Motion
>
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