Phil

In house we see very few failures....but the returns from the customer are
causing concern. The failures have been an ongoing issue.

The customer incorporated ERG's backlight driver circuit into their design
so we are stuck with the cap.

I got hold of note from ERG which recommended PCB layout to cut the slot and
to conformal coat the caps. But there was no mention of flux type.  We use
no-clean do to about 12 parts that can not be washed and customer does not
want the cost of hand soldering these.



_____________________________
Andre Leclair
Process Engineer
Ansen Corporation
315-393-3325 ext 293
315-393-7638 FAX


-----Original Message-----
From: Phil Nutting [mailto:[log in to unmask]]
Sent: Wednesday, April 05, 2006 2:21 PM
To: TechNet E-Mail Forum; Andre Leclair
Subject: RE: [TN] Arching or Current Leakage


Andre,

Based upon 500v at 6mA with 0.1 spacing I would want to look for
alternatives.  What happens if the boards are well cleaned?  Do you
still see failures?  Are you locked into that capacitor?  We have
applications where we cut a slot between the component pins, then we
reduce the potential for surface tracking or creepage.

Phil

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Andre Leclair
Sent: Wednesday, April 05, 2006 2:12 PM
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). ???

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