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May 2006

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Subject:
Re: Distance between external and internal layers 4Layer FR4
From:
Tim Reid <[log in to unmask]>
Reply To:
(Designers Council Forum)
Date:
Tue, 30 May 2006 16:10:16 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (59 lines) 
Hi, Erika,

When you say it should not change later, are you refering to just this job, or all future
jobs? If it is for this job only, I would ask the fab vendor (if known) for a legitimate
stackup and incorporate that into your fab drawing(s).

Fab shops usually modify stackups depending on the materials they have available on
hand, routing/impedance environment requirements, etc. If you are making a generic
stackup to be used for multiple jobs, then I would make a note stating 'Final Stackup
TDB (to be determined) by Fab Vendor' or if you are using the same fab vendor each
time, just ask them for something to put on your drawing(s).

Hope this helps,
Tim

........................

Date sent:              Tue, 30 May 2006 15:41:35 -0500
Send reply to:          "(Designers Council Forum)" <[log in to unmask]>,
                "Sanchez-Benavides, Erika" <[log in to unmask]>
From:                   "Sanchez-Benavides, Erika" <[log in to unmask]>
Subject:                [DC] Distance between external and internal layers 4Layer FR4
Originally to:          Designers Council Forum <[log in to unmask]>
To:                     [log in to unmask]

> Hi!
>
>
> What is the standard distance between External and internal layers
> for 4-layer board, FR4?
>
> Should I specify an specific distance in my notes?
>  In any case, the key point is that whatever is specified now should not
> change later.
>
> How can I get this?
>
> Thanks in advance for your help.
>
> Erika
>
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