Why are vendors so reluctant to ask the customer what is the intention
behind their vague notes?

As a board designer, I wish vendors would just ask me what I meant,
instead of trying to get a consensus on a forum.

Jack (the "lone voice crying in the wilderness" guy)


----- Message from Stephen Gregory <[log in to unmask]> on Tue,
17 May 2005 08:03:12 -0500 -----
Subject:
Re: SMOBC question...
Hi Jeffery,

The board that I'm talking about doesn't seem to be that old
design-wise. So do you think that maybe the note is just something
kind of got "boiler-plated" from earlier designs?

A description of the board is that it is a VME styled board, and
everything
on the board is SMT including headers, right angle push button switches,
etc., the only through-hole is two press-fit right angle connectors. So
the
board is never going to see wave solder.

The board is 15-layers and only .065" thick. Do you think that maybe the
reason they have the note prohibiting HASL is because they don't want
to thermally shock the board which may cause other problems?

Kind regards,

-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAXJack C. Olson
10G Circuit Board Designer
(630) 754-2431



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