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September 2006

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Subject:
From:
Steve Gregory <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Steve Gregory <[log in to unmask]>
Date:
Fri, 8 Sep 2006 09:49:44 -0500
Content-Type:
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Hi Dave!

Yes it's FRIDAY!! (Thank goodness!!) I got your picture and it's posted.
Pretty "dramatic" all right...looks like the thing turned itself inside
out! check out:

http://stevezeva.homestead.com/files/Daves_Tantalum.jpg

I had another picture sent to me that's just as "dramatic". But I think
that this one shorted somehow or was put on backwards...almost blew the
traces off the board! Look at this one:

http://stevezeva.homestead.com/files/Crispy_Tantalum.jpg

Then there's another picture. This one is almost beyond
desciption...check out:

http://stevezeva.homestead.com/files/Real_Crispy_Tantalum.jpg

I wouldn't want to even be around that one, that's for sure!

-Steve Gregory-

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: Friday, September 08, 2006 7:35 AM
To: [log in to unmask]
Subject: Re: [TN] Tantalum Caps

Hi Steve! It must be Friday if we are discussing exploding components!
Kemet has an very good summary of what can happen to Ta capacitors - in
short they can have a self sustaining metal oxide fire! Here is the
Kemet
reference: Kemet Electronics Corporation Tantalum Applications Notes,
Surge Step Stress Testing in Tantalum Capacitors, 05/03/00. And I'll
send you a much more "dramatic" photo to post! All components have
limits and Ta caps are no exception.

Dave Hillman
Rockwell Collins
[log in to unmask]




             stephen gregory
             <stephengregory58
             [log in to unmask]>
To
             Sent by: TechNet          [log in to unmask]
             <[log in to unmask]>
cc

 
Subject
             09/07/2006 06:17          Re: [TN] Tantalum Caps
             PM


             Please respond to
              TechNet E-Mail
                   Forum
             <[log in to unmask]>
             ; Please respond
                    to
              stephen gregory
             <stephengregory58
             [log in to unmask]>






Hi John!

  Certanly can! They can literally EXPLODE!! I have a graphic example of
that with a picture that was sent to me some time ago when I asked about
Tantalums being moisture sensitive. Check out:

  http://stevezeva.homestead.com/files/Rpt_Molded_Tant.jpg

  This is what a tantalum looked like after it came out of reflow!!

  -Steve Gregory-

John Foster <[log in to unmask]> wrote:
  Can Tantalum Caps suffer from popcorning?

Can tant caps absorb enough moisture to cause this type of effect.

We just built some new boards and we have one particular part number
tant that is shorting out left and right.

any input will be appreciated thanks

John Foster

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