Gary

I am sure you have additional specifications on your board other than
" material .062 thick FR4 green
copperclad laminate for their bare board." Such as perhaps the IPC end
point specification.

If this is a high speed board you may need to specify the impedance, the
dielectric coefficient and the loss tangent of the material. You may
also want to specify the copper weight if the board is transporting
large amperages. These are of course, only a few of the many variables
the designer most control depending upon the intent of the board. Once
these requirements are understood, the supplier can build a satisfactory
board if it is within their capability The specifications are, however,
the responsibility of the customer.

My experience has been the variation of board properties is not so much
a function of geography, but how well the board has been specified by
the designer and how well the customer monitors the supplier to insure
compliance with the spec and drawing.

Best regards

Lee

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gary Bremer
Sent: Wednesday, January 12, 2005 10:18 AM
To: [log in to unmask]
Subject: [TN]

Hello Designer Council members

At the company I am working for is calling out matterial .062 thick FR4
green
copperclad laminate for their bare board.

My question for the form:

When this design was done in the Northeast by the electrical engineer
and
outsourced to a board assembly house as a turnkey component.  What type
of
quality problems can I expect to deal with durning final assembly and
final
test?  What long term (customer returns) problems may result from this?
Do the
board fabracation houses on the east coast march to a different drummer
than
the rest of the country?  The electrical engineer does not want to
change the
drawing to specify what laminate matterial he truly intends to use.  The
last
company I worked for also had this same type of problem.  The electrical
engineer designs/releases and I have to fix his mistakes.

Gary Bremer
Senior Manufacturing Engineer
Company located in California

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