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Wed, 5 Apr 2006 13:46:21 -0700 |
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At those voltages make sure the circuit design does not require a
tighter tolerance range and/or leakage rate than the part is capable of
achieving.
If you have isolated the failure mechanism to the surface trace/pad
spacing relationship and eliminated any internal ( barrel, ground/power
plane, trace ) concerns, then remove the cap and clean the area and
replace the cap. Take another one and remove the cap; clean the area
between and around the lands and hard-wire in the cap parallel to the
pads and retest. If this works than in the redesign: increase the
spacing; change the flux and cleaning process; and slot the spacing
between the lands.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Andre Leclair
Sent: Wednesday, April 05, 2006 11:12 AM
To: [log in to unmask]
Subject: [TN] Arching or Current Leakage
We have a customer that has a portion of a circuit which randomly fails.
The circuit is a backlight driver (500volt 6mA). The output caps are
0.100 spacing of the terminals. The process used is No-clean. Can the
No-clean contribute to failures of the circuit (ie promote arching or
current leakage across the body of the output caps). ???
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Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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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
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