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October 2003

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Subject:
From:
Dave Hillman <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 23 Oct 2003 08:29:27 -0500
Content-Type:
text/plain
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text/plain (169 lines)
Hi Jim! Sorry, I haven't had my Diet Coke yet so both braincells aren't
fully functional! There are a number of immersion silver chemistries
available in the industry. I have experience with two - Enthone's
Alphalevel and McDermid's Sterling. Both of these chemistries passed our
internal qualification testing with the Sterling chemistry being rated
slightly higher due to process consistency. We are gearing up to test
AtoTech's immersion silver chemistry this year. Each chemistry suppler has
a recommended finish thickness. There were a couple of very good papers at
the IPC Fall meeting covering immersion silver finishes (authors - Toscano
and Milad) - I would recommend reading those for additional insight.

Dave



                      "Marsico, James"
                      <James.Marsico@DP        To:       [log in to unmask]
                      .AIL.COM>                cc:
                      Sent by: TechNet         Subject:  Re: [TN] inmmersion silver
                      <[log in to unmask]>


                      10/23/2003 08:20
                      AM
                      Please respond to
                      "TechNet E-Mail
                      Forum."; Please
                      respond to
                      "Marsico, James"






OK...  but what's the recommended chemistry (or what choices are there) and
what's the recommended thickness?

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:   [log in to unmask]
[SMTP:[log in to unmask]]
        Sent:   Thursday, October 23, 2003 9:17 AM
        To:     [log in to unmask]; [log in to unmask]
        Cc:     [log in to unmask]
        Subject:        Re: [TN] inmmersion silver


        Hi Jim! The 4-14 Plating Processes subcommittee is currently
working
on
        specifications for immersion silver and immersion tin. ENIG  was
covered
        with the publication of the IPC-4552 specification. I would
recommend you
        call out the specific immersion silver chemistry, a thickness range
and a
        solderability requirement on your drawing note(s) until the 4-14
committee
        can complete their work. Good Luck.

        Dave




                              "Marsico, James"

                              <James.Marsico@DP        To:
[log in to unmask]

                              .AIL.COM>                cc:

                              Sent by: TechNet         Subject:  [TN]
inmmersion silver
                              <[log in to unmask]>





                              10/23/2003 06:30

                              AM

                              Please respond to

                              "TechNet E-Mail

                              Forum."; Please

                              respond to

                              "Marsico, James"









        Hello Technet:
        What's the best way to specify immersion silver finish on a PWB?
In
        accordance with what?  Thickness?  Anything else?

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

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