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March 1997

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Subject:
Re: Selective PCB plating
From:
"Harlan Vince"<[log in to unmask]>
Date:
Mon, 10 Mar 97 11:34:05 -0500
Content-Type:
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     Yes,  You can also plate with OSPs and Hard/TAB gold.  This works very
     well if you are utilizing Gold/Card Edge Connectors or something
     similar that requires a gold contact surface.

     Ni/Au PWBs in wave solder or SMT reflow solder very well.  We limit
     the Au thickness to 2-6 microinches (very important).  We have
     experienced some "peculiarities" in wave solder but not directly
     attributed to Ni/Au PWBs.  For some reason a Ni/Au PWB does not
     tolerate touchup or post-wave assembly as well as a HASL or OSP PWB.
     Maybe someone more knowledgeable on this topic can shed some
     additional light.

     Harlan


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Subject: Selective PCB plating
Author:  <[log in to unmask]> at INTERNET
Date:    3/10/97 9:49 AM


Does anyone know if you can selectively plate with OSPs and Immersion
gold on the same PCB?  I would like to do immersion gold on my keypad
contacts but use something Like Entek on the rest of the PCB.  Is this
possible?

My PCB assembly vendor doesn't like reflowing immersion gold PCBs.  He
claims the solder doesn't flow very well.  Is it just him or the rest of
the industry?

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