please clarify for me (I'm sluggish today): do you want the thickness
specification for each individual core in the construction, without the
copper foils on the core, or do you want the thickness specification for
the total PCB thickness over laminate, excluding the external foils and
plating ?
If the latter, see IPC-D-325 A, page 32, Figure 5-1, Typical Multilayer
Master Drawing.
Valerie
Franklin D Asbell <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
10/16/2006 01:22 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Franklin D Asbell <[log in to unmask]>
To
[log in to unmask]
cc
Subject
Re: [TN] laminate thickness - new replacement chart for old D-275 Table
3-5
Phil,
Look in IPC 4101.
Also, if you type "pcb laminate thickness" into an internet search engine
(i.e. Yahoo) it will link you to sites that have this information free.
A word of caution, by specifying "finished" laminate thickness you may be
limiting the flexibility of the fabricator and most likely increase the
cost
of the product.
I would suggest you get feedback from your main suppliers of pcb fabs
before
you implement this type change.
Franklin
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Monday, October 16, 2006 10:41 AM
To: [log in to unmask]
Subject: [TN] laminate thickness - new replacement chart for old D-275
Table
3-5
In IPC-D-275 there was a chart (Table 3-5) which defined "IPC Standard
Laminate Number" in steps L1-L16.
Has that been replaced by a newer document? If so, can you point me to
it please?
We are attempting to specify the finished laminate thickness, without
the copper factored into the measurement.
Thanks in advance,
Phil
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