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Sender:	DesignerCouncil <[log in to unmask]>
X-To:	Designers Council Forum <[log in to unmask]>, "Brooks, Bill" <[log in to unmask]>
Date:	Wed, 4 Nov 2009 13:31:17 -0800
Reply-To:	"(Designers Council Forum)" <[log in to unmask]>, [log in to unmask]
Subject:	Re: Standard construction for a 4 layer board...
From:	"[Jeffrey] [Jenkins]" <[log in to unmask]>
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Bill,

I've spec'd out the IPC4101/26 (laminate and prepeg) for most of my eutectic based boards, generally without issue. 370hr is a good material for this, but there are many others.

But in regards to the 4 layer stack-up, I've seen the vendors come back with 10/40/10, 20/20/20, 15/30/15 and 12/35/12 which will all after plating finish up with around .62" +/-.007".  It almost always depends on what they happen to have on hand that will meet the requirements.  I try not to leave it chance to much and will through on intended thickness with tolerances.

Best Regards,

-Jeffrey

Jeffrey A. Jenkins, CID+
Sr. PCB/CAD Designer
L-3 Communications - Linkabit Division
Office: 858-552-9832
Email: [log in to unmask]

-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Brooks, Bill
Sent: Wednesday, November 04, 2009 10:20 AM
To: [log in to unmask]
Subject: [DC] Standard construction for a 4 layer board...

I need to ask the designers and particularly the manufacturers a
question. 

IS there a standard construction for a 4 layer FR4 board? 
What thickness core and what prepreg arrangement would be used if I
asked for a IPC 4101/26 material to be used without specifying the
stackup thicknesses? 

Best regards,
 

Bill Brooks | Datron World Communications, Inc.
PCB Designer/Engineer | Office: 760-602-7004| Fax: 760-597-3777 |
[log in to unmask]
1808 Aston Avenue, Suite 230, Carlsbad, CA 92008 | www.dtwc.com

Performance You Require. Value You ExpectTM

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