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November 2000

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Subject:
From:
"Misner, Bruce" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 2 Nov 2000 09:01:50 -0600
Content-Type:
text/plain
Parts/Attachments:
text/plain (133 lines)
Ron,

Wasn't there a Nickel plate over the Alloy 42? And something protective,
like Au, over the Nickel? What does the component manufacturers spec sheet
say for lead composition and finish?

Bruce Misner

> ----------
> From:         Ron Waugh[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;[log in to unmask]
> Sent:         Thursday, November 02, 2000 8:27 AM
> To:   [log in to unmask]
> Subject:      [TN] Alloy 42
>
>      Technetters,
>
>      I have a huge problem with the wetting and solderability of a fine
>      pitch 15 mil QFP.  I then spoke with the solder supplier; which
>      requested a couple of the components and performed x-sections.
> During
>      the x-sections, they also performed a metal composition of the
>      components lead.  The metal in the leads turned out to be alloy 42,
>      which is ....non-wetting???? ...."or so I'm told".
>
>      I really don't know much about metals but the solder supplier stated
>      that the component will never wet properly.  I would really like to
>      get some literature on this alloy 42 and ask if anyone else has had
>      any of these problems and what was their fix.
>
>      Thanks in advance for your time and energy.
>
>      Regards,
>
>      Ron Waugh
>      Process Engineer
>      Diversified Systems, Inc.
>      Phone: (317) 299-9547 Ext. #336
>      Fax:  (317) 298-2055
>      Email: [log in to unmask]
>
> --------------------------------------------------------------------------
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> additional
> information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
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> --------------------------------------------------------------------------
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>

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