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Subject: TechNet: confirmation required (79A054)
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Date: 9/14/98 6:44 AM
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Date: Mon, 14 Sep 98 06:43:13 -0500
From: "Ron Hollandsworth"<[log in to unmask]>
To: <[log in to unmask]>
Subject: Phosphorous in the Nickel Barrier Level
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Hello Technetters:
We are currently producing a number of printed wiring boards utilizing
a Ni/Au plating for the final finish. The majority of these boards
perform well throughout the process, but we have experienced
solderability issues on a few assemblies that contain heavy copper
(ground and/or power planes) on multiple layers. One of the causes is
the presence of Phosphorous in the Nickel Barrier Level. Each thermal
excursion the board is subjected to after the plating operation
results in a higher level of phosphorous being present at the
solderable surface.
Are there any printed wiring fabrications shops out there that utilize
what is referred to as a "low phosphorous nickel" (<6%) for plating
versus a "medium phosphorous nickel" (6-9%)? To date, all the shops
we have contacted utilize the "medium phosphorous nickel>
Need some help.
Thanks
Ron Hollandsworth
[log in to unmask]
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