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what exactly dielectric thickness in 4layer stackup means?

 
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ssankurathri



Joined: 16 Mar 2006
Posts: 90
Helped: 5
Post08 May 2008 6:50   what exactly dielectric thickness in 4layer stackup means?
hi
am just messed up with terminology prepreg, core, dielectric thickness in the stackup...
could anyone plz provide some reference (preferrably pictorial view) for 4layer board.

regards
skr
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mh123sh



Joined: 08 May 2008
Posts: 4
Post08 May 2008 9:06   Re: what exactly dielectric thickness in 4layer stackup mean
Core : a laminate with both sides coated with copper (copper thickness 0.5oz, 1z..)
Prepreg: only dielectric material.

Prepregs are used stack the cores together.
Cores are used to form the inner layers

typical 1.6mm (63mil) 4 layer stackup
GND,POWER is 1oz (1.3mil) copper

TOP -------------------------signal 1
PREPREG (10mil)
------------------------------GND
CORE(40mil)
------------------------------POWER
PREPREG (10mil)
BOT -------------------------signal2

Hope this will help you to undersatnd.
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ssankurathri



Joined: 16 Mar 2006
Posts: 90
Helped: 5
Post09 May 2008 6:05   Re: what exactly dielectric thickness in 4layer stackup mean
thanks...that was really helpful....
just a quick one...can the core be also treated as a dielectric? i read it somewhere that core is nothing but prepreg mixed up with some resin an will be dielectric in nature.
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nathan80



Joined: 23 Feb 2006
Posts: 65
Helped: 5
Location: Malaysia
Post09 May 2008 10:42   Re: what exactly dielectric thickness in 4layer stackup mean
the core layer has copper traces on the top and bottom to form the inner layers.

core is definately a dielectric; otherwise power plane and gnd will be shorted.
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venkat_kvr



Joined: 24 Jan 2007
Posts: 258
Helped: 15
Post09 May 2008 13:01   Re: what exactly dielectric thickness in 4layer stackup mean
ssankurathri wrote:
hi
am just messed up with terminology prepreg, core, dielectric thickness in the stackup...
could anyone plz provide some reference (preferrably pictorial view) for 4layer board.

regards
skr


this will help u

Sorry, but you need login in to view this attachment
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