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March 2012

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Subject:
From:
Ian Hanna <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ian Hanna <[log in to unmask]>
Date:
Mon, 26 Mar 2012 10:28:15 -0400
Content-Type:
text/plain
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text/plain (60 lines)
naw, i'm new -- this is only year 14 for me....



From:
Jack Olson <[log in to unmask]>
To:
<[log in to unmask]>
Date:
26/03/2012 10:13 AM
Subject:
Re: [TN] ASSY: Short leads in a PWA
Sent by:
TechNet <[log in to unmask]>



16 YEARS at TechNet?
I still feel like "the new guy"!!!

onward thru the fog,
Jack


On Wed, 27 Mar 1996 07:16:59 -0800, Jack Olson <[log in to unmask]> wrote:

>[log in to unmask] wrote:
>>      Due to a "non-existent" clearance between a PWA and a shielded 
case,
>>      we would like to have certain components with lead lengths that 
are
>>      not long enough to protrude through to the secondary side of the
>>      board.  Thus, there would be no fillet for a solder joint.
>
>We had a similar situation, but in our case we specified that the leads 
be
>clipped (after soldering), and the fillet ground down to .030 mils. These
>boards were for airplanes and had to undergo shock, vibration, 
environmental
>testing etc. NO PROBLEMS. Of course, you said your clearance was
>"non-existent", can you spare 30 mils? And by "shielded case" do you mean
>conductive? You might have to apply some adhesive KAPTON over the pads 
after
>you grind them, but at least by grinding you have the most lead length, 
and
>strongest solderjoint possible, still much stronger than a SMT 
connection,
>right?
>             Jack
>p.s. I would like to hear what others recommend, though... anybody else?
>
>



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