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Reply To: | TechNet E-Mail Forum. |
Date: | Wed, 15 Dec 1999 12:54:17 -0500 |
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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!
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