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August 2003

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Subject:
From:
"Wenger, George M." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 28 Aug 2003 15:47:51 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (283 lines)
Dave,

I had just gotten back from a run and it was hot and I just downed two
Diet Pepsi's (unlike Doug I'm not a Dew-Man or a Diet Coke-Man like you)
and couldn't resist poking a little fun.  I sort of guessed you must
have been talking about a military microwave product that used
electrolytic silver and converted to immersion silver when it was
available.  However, the point you made as well as the others who
responded to the immersion silver question certainly confirms immersion
silver is a good choice.

Regards,
George
George M. Wenger Andrew Corporation
40 Technology Drive, Warren, NJ 07059
(908) 546-4531 [log in to unmask]


-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]

Sent: Thursday, August 28, 2003 3:44 PM
To: [log in to unmask]; Wenger, George M.
Cc: [log in to unmask]
Subject: Re: [TN] Immersion Silver vs. White Tin


Hi George! Ok, maybe I smudged the calendar a bit (I blame it on not
enough
Diet Coke for the day). We began producing the assembly in 1993 as an
electrolytic silver finish (the assembly is an RF design) and switched
to
immersion silver in the 1994 timeframe - immersion silver was a very new
creature in those days but we were pretty happy with its performance.
The
immersion silver finishes have gotten even better since the 1994-1997
timeframe when many of us were trying to understand them. I'll go get
another Diet Coke - it will improve my math!

Dave


 

                      "Wenger, George

                      M."                      To:       [log in to unmask]

                      <George.Wenger@AN        cc:

                      DREW.COM>                Subject:  Re: [TN]
Immersion Silver vs. White Tin                                       
                      Sent by: TechNet

                      <[log in to unmask]>

 

 

                      08/28/2003 02:33

                      PM

                      Please respond to

                      "TechNet E-Mail

                      Forum."; Please

                      respond to

                      "Wenger, George

                      M."

 

 





Dave,

Are you sure about the 10 years/  Could it be more like 6-7 years?  The
first knowlede I had about immersion silver wass from the SSTC
Conbference
at the NPL in Oct 1996.  Anyway what's a couple of years, the result is
the
same immersion silver works.  My old employer was in volume production
of
immersion silver assemblies since 1997 and immersion silver is the
surface
finish of choice in my new company.

Regards,
George

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



-----Original Message-----
From: Dave Hillman [mailto:[log in to unmask]]
Sent: Thursday, August 28, 2003 3:18 PM
To: [log in to unmask]
Subject: Re: [TN] Immersion Silver vs. White Tin


Hi Jim! We have done a bunch of testing and have found that the
immersion
silver finish does not impact the solder joint reliability for a
controlled
soldering process. We published the BGA data at the IPC APEX 2000
meeting
in Long Beach (the paper should be listed in the proceedings). We have
also
been producing an immersion silver assembly for 10 years for a military
customer with no issues. Nothing solders like solder but immersion
silver
isn't too far behind.

Dave Hillman
Rockwell Collins
[log in to unmask]




                      "Marsico, James"
                      <James.Marsico@DP        To:       [log in to unmask]
                      .AIL.COM>                cc:
                      Sent by: TechNet         Subject:  Re: [TN]
Immersion
Silver vs. White Tin
                      <[log in to unmask]>


                      08/28/2003 11:59
                      AM
                      Please respond to
                      "TechNet E-Mail
                      Forum."; Please
                      respond to
                      "Marsico, James"






Just out of curiosity, does the immersion silver effect long term
reliability of tin-lead solder joints?

Jim Marsico
Senior Engineer
Production Engineering
EDO Electronics Systems Group
[log in to unmask] <mailto:[log in to unmask]>
631-595-5879


        -----Original Message-----
        From:   Dave Chapman [SMTP:[log in to unmask]]
        Sent:   Thursday, August 28, 2003 12:53 PM
        To:     [log in to unmask]
        Subject:        Re: [TN] Immersion Silver vs. White Tin

        Agreed, Immersion Silver was a drop in replacement both at
reflow
and wave.
        Silver was lower cost or same as HASL. Only caution, the joints
do
look
        different than HASL boards so education rather than rejection is
the
word of
        the day.

        As with all alternate finish boards handling is important, hands
off
the
        board, slip sheets needed on only the top and bottom boards
since
the
        finish is actually below the surface of the solder mask so no
big
risk of
        scratching) in vacuum sealed bags, remove from packaging just
before
        processing, don't let sit on the shelf unless fully processed,
don't
wait
        3-4 weeks to run through the wave after SMT because you may see
tarnish,
        although solderability is still good, statistically the sooner
processed the
        better.

        White Tin we had to go to higher temp profile and watch every
step.
        Congratulations on going to Lead Free PCB's
        Dave Chapman

        -----Original Message-----
        From: Bill DeCray [mailto:[log in to unmask]]
        Sent: Thursday, August 28, 2003 11:34 AM
        To: [log in to unmask]
        Subject: Re: [TN] Immersion Silver vs. White Tin


        Immersion silver would be the best choice

        Highest Regards
        William W. DeCray III
        Sales Engineering Manager
        Waytec Electronics Corp.
        Phone: (434) 237-6391 Ext 115
        Fax:   (434) 237-1324
        Cell:  (434) 851-6115
        E-mail [log in to unmask]
        Website www.waytec.com


        -----Original Message-----
        From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve
Gregory
        Sent: Thursday, August 28, 2003 11:31 AM
        To: [log in to unmask]
        Subject: [TN] Immersion Silver vs. White Tin

        Hi All!

        Got a customer that's calling out on the fab drawing, either
Immersion
        Silver
        or White Tin for a board finish.

        Me, not having great deal of experience with either one (yet),
am
        wondering
        if I had to choose, which one would I choose?

        Have any of you worked with both, and have a preference of one
over
the
        other? Why?

        As always, thanks in advance!

        -Steve Gregory-







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