Jack,
Catapult does boards with 10-18 layers, up to 15,000 vias.
We have had good luck using Polyclad 370 and Isola Fr-408
material.
I can also tell you that in order to get to these two materials,
it took 6-8 months running half a dozen vender recommended
materials through our CMs production cycle processes.
Some of the recommended materials fell apart in one way or another.
My suggestion is to run your own tests, in your own environment and
don't accept blanket statements made by anyone at this point.
Hope this helps.
dave
Jack Olson wrote:
>OK, I didn't get much response to my "informal poll"
>(thanks Dewey and Werner!),
>so I'll ask one more specific question before I start getting grouchy
>(grin)
>
>If you attend Lead Free Reliability presentations by people like
>Werner Englemaier or Gary Ferrari (highly respected in our industry)
>they recommend a material like IPC-4101/126 or /129
>
>If you go to websites like Merix (also highly respected)
>http://www.merix.com/RoHS+_+Lead+Free.aspx?id=4
>they recommend something different
>
>(so don't say, "ask your fabricator")
>
>Does anyone have knowledge that would help clarify the discrepancy?
>Is the /126 /129 just SUPER reliable over /99 and /124?
>(ok, that was more than one question)
>we are auomotive, but I know I am going to be asked to justify
>the added expense sooner or later...
>maybe I'm just looking for a group hug.
>sheep mentality.
>baaa....
>
>and no, I'm not a materials expert, but I MUST call out SOMETHING.
>and SOON!
>(I'm trying to wade through the materials info in the new Printed
>Circuits Handbook, but its still confusing.
>But hey, maybe I WILL be a materials expert by next week, huh?)
>
>onward thru the fog,
>Jbro
>
>
>On 10/29/07, Whittaker, Dewey (EHCOE) <[log in to unmask]> wrote:
>
>
>>Yes and a few additional requirements.
>>Yes and /129 also.
>>It depends (cha-ching).
>>Yes.
>>Yes.
>>1.5 mil avg. with 1.2 mil minimum.
>>
>>Dewey
>>
>>-----Original Message-----
>>From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
>>Sent: Monday, October 29, 2007 10:28 AM
>>To: [log in to unmask]
>>Subject: [TN] Bare-Board Materials for Lead-Free Soldering
>>
>>I'm hoping to get an informal poll of fabricators and people who specify
>>bare board materials.
>>
>>There's been a lot of literature and presentations lately that
>>recommend numbers for better material performance under the higher
>>soldering
>>temperatures.
>>
>>IPC-4101/126
>>Tg=170 or higher
>>Td=340 or higher
>>maximum expansion 3%
>>etc.
>>
>>I'm not questioning the wisdom of the numbers, I'd just like to know
>>whether
>>everyone (who is doing lead free soldering) is really USING these
>>numbers?
>>Or this material? Is there no wiggle room anymore? (EVERY example I see
>>now,
>>lists /126 material)
>>
>>I've also been advised to use a thicker minimum hole wall thickness than
>>before. Is that common now? >1mil?
>>
>>thanks,
>>Jack
>>
>>
>>
>>
>
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--
Dave Seymour, CID+
Catapult Communications Inc.
800 Perimeter Park Dr, Suite A
Morrisville, NC 27560
Direct: (919)653-4249
Main: (919)653-4180
Fax: (919)653-4297
[log in to unmask]
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