[SI-LIST] Failed Tantalum capacitors - package hermeticity compromised

Content-type: text/plain; charset=us-ascii
Content-transfer-encoding: 7BIT
 
Recently we have had some tantalum capacitors rated at 16V fail on turn
of in a 12V circuit. While some percentage of low ESR capacitors
experience a high surge infant mortality on first turn on unless
serrated by 50% or more, these capacitor were sent for additional
electrical screening at an independent test house.
 
Just as a precaution we decided to also sample test the lot for package
hermeticity by conducting a bubble test. 25 samples were picked at
random from the lot of 450 and 100% of these failed bubble test.
 
Has anyone had this problem before? Has any had counterfeit capacitors?
 
Steven Salkow
Lockheed IS&S
3130 Zanker Rd, San Jose
Ca. 95134
(408) 473-4058
H: (925) 462-1075
steven.salkow@xxxxxxxx
salkow@xxxxxxxxxxxx
 
 



-- HTML Attachment decoded to text by Ecartis --
-- File: header.htm
-- Desc: header.htm

 


----------------------------------------------------------------------------



----------------------------------------------------------------------------



----------------------------------------------------------------------------



----------------------------------------------------------------------------


  

  

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field


List technical documents are available at:
                http://www.si-list.net

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: