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February 2000

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Subject:
From:
Mark Ross <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 11 Feb 2000 09:23:58 -0500
Content-Type:
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text/plain (77 lines)
Harris' suppression division is now Intersil.  Preforming MOV leads will
cause failures if the device is subject to vibrational tests like those
required by UL for consumer devices.  The preform weakens the lead and it
eventually fails due to the vibration.  However this is only what I have
found in the past and only on huge devices, not those tiny ones that are no
bigger that a dime.  I am talking strictly about those 150V 80 Joule and
above type of device.

Mark Ross


-----Original Message-----
From: John Brewer [mailto:[log in to unmask]]
Sent: Friday, February 11, 2000 9:17 AM
To: [log in to unmask]
Subject: [TN] MOV preforms


     [log in to unmask] writes:

> Hello all,
>
>  We use a significant amount of MOV's (TH) in our products and have just
been
>  told by the supplier that we are the only ones in the U.S. that has the
>  leads prepped with a kink just below the meniscus

Whoa!

Supplier fairy tale time.

We have several volume MOV parts where we've created a
"snap in" preform to eliminate the "epoxy dip in PTH" syndrome.

The vendor in question even developed special tools to
create this preform, at no charge. Works great, and we
eliminated having to thread a standoff insulator.

The preform has a crimp above and below the board surface
to stand it off,and hold the part in place.

Harris has preforms still in their catalog which may work for
your application. I cant remember who Harris MOV stuff was spun
off to...was it Littelfuse?

Hope this helps
John

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