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April 2006

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Subject:
Re: Capacitor Metamorphosis (to Werner)
From:
Leland Woodall <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Leland Woodall <[log in to unmask]>
Date:
Fri, 21 Apr 2006 17:46:06 -0400
Content-Type:
text/plain
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text/plain (59 lines) 
Werner,

Just a quick question.  What are you speaking of below when you suggest eliminating solder fillets on the end caps?  Aren't those fillets necessary for reasons of reliability?

Leland Woodall
Quality Coordinator

Keihin Carolina System Technology, Inc.

***********************************************************************

Werner Engelmaier <[log in to unmask]> wrote:
  Hi Ahmet,
Capacitor cracking with SAC solders is more prevelant then with SnPb solders.
The reasons are:
1) a larger delta-T from solidification to RT;
2) SAC is stiffer and stronger;
3) SAC creeps slower.
The way to solve the problem is to reduce significantly--or better yet
eliminate-- the solder fillets at the end caps. This can be accomplished by
significantly reducing the soldering pad size on the PCB.

Werner

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