Have you considered the pitch of the layout. Auto insertion or lead forming
damage? If the pitch is unique to this one location and all the parts are
formed the same? OUCH.

Guy Ramsey
Senior Lab Technician / Instructor


E-Mail: [log in to unmask] <mailto:[log in to unmask]>
Ph: (610) 362-1200 x107
Fax: (610) 362-1290



-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Phil Nutting
Sent: Thursday, October 11, 2001 12:54 PM
To: [log in to unmask]
Subject: Re: [TN] failing capacitors


I'm not sure if this is an electrically induced failure.  I can tell you
that when the cap is replaced the system works well and the cap no
longer shows signs of failing.

An interesting thought... used in an application it cannot support.  I
don't have the answer to this one or the knowledge to analyze the
design.

Well, the EE specified what parts to use and the board layout designer
placed the components with the approval of the EE. So I guess they are
both at "fault".

-----Original Message-----
From: Guy Ramsey [mailto:[log in to unmask]]
Sent: Thursday, October 11, 2001 10:09 AM
To: [log in to unmask]
Subject: Re: [TN] failing capacitors


Are we sure that this is not an electrically induced failure? Is the
component serviing in an application that it cannot support? By designer
are
we talking EE or board layout designer?

Guy Ramsey
Senior Lab Technician / Instructor


E-Mail: [log in to unmask] <mailto:[log in to unmask]>
Ph: (610) 362-1200 x107
Fax: (610) 362-1290



-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Phil Nutting
Sent: Thursday, October 11, 2001 10:17 AM
To: [log in to unmask]
Subject: [TN] failing capacitors


Here is an interesting question.

We use Roederstein film capacitors (through hole configuration) in many
of our boards.  Typically all boards are run through our wave solder
machine with the same recipe.  The weird thing is that some of these
caps fail either open or shorted but only on the boards belonging to one
design engineer.  Is this "full moon residue", a circuit design issue or
is it possible a regular failure that no one else is complaining about?
We keep track of our test failures and if this were happening on many
other boards we should be seeing the data, but there is none.

I'm interested in what your thoughts may be.

Thanks in advance.

Phil Nutting

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