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

Steven

Which kind of product or board do you apply the Tantalum capacitors in? I
have met two kind of cases in whch the Tantalum capacitor failed.
   1. The backplane. When the connector is pressed on the backplane, the
capacitor catches great stress.
   2. The power module. Because the PCB is too small, several PCB are
assembled together and are seperated later. While seperating, the capacitor
catches great stress.
Hope this is helpful for you.

Best Regards

Zhangkun
2009.2.1

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代表 Salkow, Steven
发送时间: 2009年1月27日 9:40
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主题: [SI-LIST] Failed Tantalum capacitors - package hermeticity compromised

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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
 
 



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