Jack,
It's like Doug's attempt at humor: close counts. /99 with a TE around 3%
and their familiarity with that material is probably your best bet.
Dewey
________________________________
From: Jack Olson [mailto:[log in to unmask]]
Sent: Thursday, May 20, 2010 6:03 PM
To: Whittaker, Dewey (EHCOE)
Cc: TechNet E-Mail Forum
Subject: Re: [TN] My first RoHS circuit board!
Thanks for the advice (everyone!)
Here's an update if anyone is interested:
I sent a sample fab dwg to our primary supplier (in China) with notes
that incorporated several of your recommendations (the main one being
material /126 170Tg 330Td 30minT288) to see if it would cause them any
problems before I send them the real order. They looked at it and said
"No Problem. Our default material meets those requirements"
So I told them that since I'm trying to learn about his I would like to
know what kind of material it was, and could they send me a data sheet.
Well, they sent a data sheet for something called S1000-2 which it says
right on the data sheet is /99, but the parameters are 175Tg 335Td
10minT288
So I wrote back and asked if they had another material that is more
robust, and they sent me data for a material called IT-180 which it says
is /24 Tg180 Td350 >60minT288(?)
I really don't think they are trying to be deceptive, but that they
honestly think the only thing that matters is the Tg and Td numbers. And
those numbers look pretty good!
So now I'm wondering how hard I should push to get them to literally buy
/126, and if by forcing them to use a material they aren't familiar
with, if there will be other problems related to drilling, or desmear or
plating or routing or whatever could be different from the /99 they are
used to. Is there a "learning curve" with these materials?
Jack
.
On Tue, May 18, 2010 at 4:41 PM, Whittaker, Dewey (EHCOE)
<[log in to unmask]> wrote:
Jack,
Just designing for RoHS compliance does not dictate the use of
non-dicey
cured material. If you are designing a fully compliant, complex,
Lead-free design that will be exposed to a minimum of two
lead-free
reflow profiles and one wave solder operation and expect it to
work for
twenty plus years, then no dicey-cured FR4 shall apply.
IPC-4101/126 and
/129 are phenolic cured materials which have demonstrated a
robustness
that is up to the challenge.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Tuesday, May 18, 2010 2:29 PM
To: [log in to unmask]
Subject: [TN] My first RoHS circuit board!
Well, we avoided it as long as we could, but now I have to
design for
RoHS
compliance.
I'm basically following Werner's recommendations (which don't
conflict
with
anyone else's as far as I know), but I'm confused about one
aspect of
material:
Several sources have stated that its better to use "NON-DICEY"
material,
but
none of the IPC-4101 slash sheets mention dicy or non-dicy (or
dicyandiamide).
If we are trying /126 material, do we still have to specify
non-dicy?
thanks,
Jack
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