The standard thickness of core material depends on who makes the laminates used by your fab.

If your fab can't make the board to your required dimensions, you need to call around and see what other fabs can get/do.

An example of available material from one laminate manufacturer can be seen at:
http://www.chemitalic.dk/content/articles/dfmmatsel.htm
A table of available laminates can be seen in design guidelines from a fab at:
http://www.tru-lon.co.uk/pdf/guidelines.pdf

Finished thickness for prepreg and some cores can be different from the raw thickness as supplied. When heated and pressed in the laminating press, some reduction in thickness of the individual layers tends to occur. The data sheet from the laminate manufacturer gives the raw and finished thicknesses. Again, the best source of information is from the fab. If you're controlling impedance, the finished thickness data is essential for modeling stripline and microstrip characteristics.

At 11:56 AM 10/3/04, you wrote:

is there a table of standard core thicknesses somewhere?

i have a 6 layer stackup

top
    prepreg
sig
    core
gnd
    prepreg
pwr
    core
sig
    prepreg
bott

and am trying to hit 062" overall thickness within +-005

what are all the material thickness possibilities out there?
(well maybe not ALL of them :) )

given 007 prepreg and 021 cores
my vendor tells me that once you add the copper thickness at 1oz
the overall is about 071" thick

sounds like 017 cores would do it, but that also sounds like a wierd number

thanks for any help


Dennis Saputelli


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