I think that is a very good approach.
Work with the fabricators of PWBs in the market or industry you are intending to design/specify/build for. They can steer you in the right direction, are willing to share their knowledge of those applications and provide tips, etc., and are usually very willing to help a potential new customer. The worst that can happen is that you walk away with some new contacts and friends.
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Jenkins, Jeffrey A @ CSG - LINKABIT
Sent: Monday, March 30, 2015 6:28 PM
To: [log in to unmask]
Subject: Re: [DC] Question of the Week - Laminates and Temperature
Jack,
For what it's worth, here is how I tackle the situation for when I need something whose performance is beyond the IPC-4101 slash sheets. The /126 is usually a starting place for me(and sometime /129), but I find the slash sheets limited when I have specific needs when it comes to RF performance and/or specialized processing (seq-lam, layer count, laser, etc).
So I usually start with this as baseline, then add on my additional processing requirements and submit those to your fav material vendors (Isola, Rogers, Park-Elec, etc) and get their feedback. Then I take that and run it by my fab houses (I like at least 2) because they usually are building boards for others with similar end-uses environments. And they are in the know of what is good for processing, provides good yields for both the fab and assy house with relation to the product type you're making, and are usually willing to share this information (though not about specific customers and such).
When I make a final material selection, I usually spec it as "Vendor Material XXX IAW IPC-4101/126" with the IPC-4101 modifiers following it. For me, repeatability is a requirement on most designs so I tend to lock it down once the final stack-up is realized. I seldom do many boards where any material in the IPC-4101/126 alone would be acceptable anymore.
In the case you presented, you know the end use (automotive from the IPC-D-279 is a good starting point). So combine those requirements with any additional one you may need, then go to talk with the vendors.
Hope this helps.
-Jeffrey
Jeffrey A. Jenkins CID+,CIT
Senior PCB Staff Designer || L-3 Linkabit || Ph: 858-552-9832 || [log in to unmask]
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