From: James
Sent: Wednesday, May 17, 2006 11:27 AM
To: 'TechNet E-Mail Forum'; [log in to unmask]
Subject: RE: [TN] Rohs Weeeeeee board material
Our customers are mostly calling out the Tg AND Td requirements rather
than the specific material. We also recommend this as it allows
fabricators more flexibility to procure the raw material.
Being a Quick turn Proto Manufacturer this is extremely important to us.
James Hofer
General Manager
Accurate Circuit Engineering
3019 S. Kilson Dr.
Santa Ana Ca. 92707-4202
714-546-2162 work
714-473-6127 cell
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Ball
Sent: Wednesday, May 17, 2006 11:10 AM
To: [log in to unmask]
Subject: Re: [TN] Rohs Weeeeeee board material
Thanks for the responses, folks.
So... I wonder now how many out there are specifying board material via
IPC-4101/XXx vs. generic this-n-that vs. specific vendor product name?
I'm guessing the preference is different depending on if you're a
callout-er or a callout-ee, and on the environment. As someone whose
target boardshop is never known until the lowest bid is in, I prefer a
generic approach. It's good to know what the rest of the world is doing
though; just for the helluvit.
Striving For a Better Tomorrow (usually more do-able on Friday), -Chris
"Whittaker, Dewey (AZ75)"
<Dewey.Whittaker@HONEYWELL To:
[log in to unmask]
.COM> cc:
Sent by: TechNet Subject: Re:
[TN] Rohs Weeeeeee board material
<[log in to unmask]>
05/17/2006 01:49 PM
Please respond to TechNet
E-Mail Forum; Please
respond to "Whittaker,
Dewey (AZ75)"
Polyclad 370HR is an excellent material, but it should be classified as
IPC-4101/126.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Fox, Ian
Sent: Wednesday, May 17, 2006 8:02 AM
To: [log in to unmask]
Subject: Re: [TN] Rohs Weeeeeee board material
Chris, RoHS doesn't bar the use of the Br retardants usually used in the
epoxy/glass used in PCBs (tetrabromobisphenol A), so you don't
necessarily need a halogen free material for RoHS compliance unless you
absolutely want to future proof the design. As far as materials go I'd
probably reference 4101/98 which is a filled material with halogen
retardant (polyclad 370HR being an example of the type) which gives
improved via reliability from a degree of Z-axis CTE control resulting
from the filler addition. I'm not sure that the halogen free materials
are sufficiently mature yet and have no experience with them so can't
recommend one, but 370HR is good.
Regards
Ian Fox
Lead Process and Materials Eng
Goodrich ECS
York Rd
Hall Green
B'ham B28 8LN
Tel: 0121 607 3763
e-mail: [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Ball
Sent: 17 May 2006 15:26
To: [log in to unmask]
Subject: [TN] Rohs Weeeeeee board material
Hello Folks-
We're trying to cost a new design which may have to be leadfree, rohs
compliant, etc...
We would otherwise reference IPC4101/21. Any recommendations as to what
we should specify for this one? We were gonna ref. /24 but that's got
bromine......
Thanks in Advance,
-Chris
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