Hi Steve! Take a look in section 4 (solders) and paragraph 9.2.4 solder
connections of the JSTD-001 handbook - those sections contain some good
information of why a solder joint may or may not be "bright and shiny". It
has been very interesting to see the "bright and shiny" dinosaur move
toward extinction as Collins has been slowing implementing alternative pwb
finishes. Nearly all of the new pwb finishes (gold, silver, tin, palladium)
result in a solder joint appearance which does not look like the appearance
a HASL pwb finish produces. Was there a specific reason why someone wanted
a "bright and shiny" solder joint or was it just a culture shock issue?
Dave Hillman
Rockwell Collins
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Stephen Gregory <[log in to unmask]>@ipc.org> on 01/04/2002 09:18:03 PM
Please respond to "TechNet E-Mail Forum." <[log in to unmask]>
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Subject: [TN] ENIG solder joint appearance
Hi All,
About to get into a discussion concerning ENIG PCB's, and solder joint
appearance.
I've used a 2% silver solder paste because from past history at other
employers, it did seem to make a difference in the overall appearance,
surface, and otherwise, for the better...
But from my perspective, ENIG plated PCB joints, won't ever look like the
joints on a HASL plated PCB. A 2% silver will make things look a little
better (In my humble opinion), but they still won't be as bright and
sparkly
as a HASL joint will exhibit...
But is that really a problem?
I know what the J-STD-001, and the -610 says, but I'm about to face some
concerns from one of our customers that the solder doesn't look as shiney
as
it should be ( I think)...bottomline, they have some concerns about the
solder...the boards in question are ENIG...
I know this has been talked about over and over again, and I used a 2%
silver
solder to try and make things look a little better. It does, but the joints
still aren't as shiney as a HASL joint....they won't be as long as you have
gold in the equation, but that doesn't mean that the joint is bad...
Next week is gonna be fun...
-Steve Gregory-
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