Hello JF,

Are you sure you just need class 1 or 2 on that part. Look at the
classification thouroughly... If an interruption of service (of the board)
is a major issue, you might be looking at a class 3 design. You can also
spec. out any changes you want on the board design, IPC standards are
guidelines, master artwork design always take precedence.

Have a nice day,

Alain Savard, B.Sc.
Chemical Process Analyst
CAE Electronics Ltd.
e-mail: [log in to unmask]


-----Original Message-----
From: Jean-Francois Bissonnette

Some people here are getting pretty nervous about one
IPC-A-610 criteria here and honestly I dont know what
what to tell them to ease their worries.

Par. 3.2.4 says that class 1 & 2 permits coating meniscus
of capacitor to be mounted into PTH.  But is'nt there a
risk of preventing the solder to be conform to criteria
4.1 table 1 (saying that the solder must fill 75% of
the hole)?  What is the risk of not respecting this criteria
(3.2.4).  Personnaly I would fear craquing for the capacitor
on the long run (plus the solder fill), this thing will be submit
to constant vibrations (It goes on a train, near the braking system).
So I would prefer to have it above the meniscus.  But here they
are concerned with the overall costing... Well I guess I need
some of these 5000 years of experience now!

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################