Gary,

Had smilar problems with a cap of this same type of construction and they
were manufactured by Sprague....

There was a problem with the seal that goes around the termination that
sticks out of the conformal coating....

In 1 lot (+10K) the seal/insulator was not sealing properly and since it,
and the electrode tip were exposed, they were subject to thermal-mechanical
damage which degraded the seal further... This allowed material into and
damaged the electrode insulation gap which caused the capacitor to short
under load.

We replaced the caps with a new "improved lot" and the problem went away...
We then replaced all caps of this package design with the molded type to
eliminate the possibility of future issues.....


Paul Edwards
Process Engineering
[log in to unmask]
Tel: 408-433-4700
FAX: 408-433-9988
Surface Art Engineering
81Bonaventura Dr.
San Jose, CA 95134
DUNS: 944740570
CAGE/NCAGE: 1XZ48

-----Original Message-----
From: Gary Bremer [mailto:[log in to unmask]]
Sent: Thursday, April 28, 2005 7:27 AM
To: [log in to unmask]
Subject: [TN] Capacitor Failures

Has any one had any problems with Vishay Capacitor P/N 595D226X9050R2T
failing?
From our electrical engineers statement the most common failure is during
in-circuit test.  This is conducted at ambient temperature & humidity.
These
capacitors are used to decouple an input voltage, which is set to increasing
values.  The failures have been occurring when a steady-state input voltage
of
around 38 VDC is used.  When the voltage is left on, the chances of failure
increases.  For example, two different capacitors were blown when the input
voltage was left on for about 2 minutes.

--
Gary Bremer
Senior Manufacturing Engineer

Curtiss-Wright Controls Inc.
Embedded Computing -Subsystem

28965 Avenue Penn
Santa Clarita, CA 91355-4185
Main: 661.257.4430 extension 2170
Fax: 661.257.4782
e-mail: [log in to unmask]
Web: www.cwcembedded.com

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------