I was with you till you said RF. That threw me for a loss tangent to my
current thought process.
Stating you were an EE and talking epoxy, I'm adhering to the premise
that you were referring to traditional FR4 materials. That being the
case, if it is a simplistic design that will be obsolete in 3 years any
IPC-4101/21/24/26/30/99/101/121/124 material fabricated into a printed
board by a Supplier who can spell coupon and talk enthusiastically about
Class 3 of IPC-6012 and IPC-2221 will work.
If however failure is not an option and long term reliability is a must
and a FR4 material is required, then traditional dicy-cured materials
are out of the equation. You must choose IPC-4101/126 or /129. Require
the Fabricator to make controlled impedance coupons and IST or HATS
coupons and pass the established acceptance criteria prior to granting
authorization to ship.
Not all materials are created equal so calling out a slash sheet that
it complies to does not guarantee success. Some Fabricators can
successfully make good product out the same material that others can
not.
The best material in the world does not a process make, but the few
materials we have qualified to IPC-4101/126 and /129 are almost
bullet-proof, so as not to be concerned with the caliber of Fabricator
you have chosen.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Honsowetz, Eric
Sent: Thursday, November 08, 2007 12:40 PM
To: [log in to unmask]
Subject: Re: [TN] Specifications for the Epoxy in Glass/Epoxy Boards
I need to be able to specify the laminate materials well enough to allow
the boards to be fabricated by multiple suppliers and achieve the same
performance from each PCB suppler without specifying to the supplier the
vendor of the laminate system. Looking at 4101 I am uncertain that the
Specification Sheets provide the detail to facilitate this, though they
may be a good start.
So my question in one sense is regarding the mixture of the epoxy. Is
it all the same epoxy (as a EE I'm not sure if epoxy is a particular
organic component or a general class of organic compounds) and if
laminate systems that meet the specification sheet come from different
vendors will they have the same electrical and mechanical performance.
(We manufacture RF circuits so this is an issue)
eric
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier /*
Sent: Thursday, November 08, 2007 2:20 PM
To: [log in to unmask]
Subject: Re: [TN] Specifications for the Epoxy in Glass/Epoxy Boards
Hi Eric,
All specifications are specific-some are just more so than others, some
are
more adequate than others.
What exactly do you REALLY want to know?
Werner
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