[PCB_FORUM] Re: Multi-layer stackup design

The problem is that the Fab. House you use may stock different standard
laminates. We use Tyco, Proto Engineering and DDI and they stock
completely different materials then our suppliers in the EU.  So we
specify what our production vendor can produce (Tyco) and force the
proto shops to comply. The EU shops hate our stickups because we specify
layer balances that they nominally don't see. These are typical in the
USA military market though.

 

________________________________

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Jose Magnaye
Sent: Tuesday, February 21, 2006 8:01 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Multi-layer stackup design

 

Hi Claude

 

We're trying to design it to be as generic as possible since we will be
using several vendors.  They can define which materials they can use for
the prepeg but the stackup design should be fixed.

 

Basically what we are trying to determine if 0.2mm thickness will be
enough for the 3 layer prepeg to withstand at least 1.5KV.

 

On 2/22/06, Claude Meyers <claude.meyers@xxxxxxxxxxxxxx> wrote: 

This is a question you should be asking your fabrication house. Every
PCB Fab house has different requirements. 

 

________________________________

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Jose Magnaye
Sent: Tuesday, February 21, 2006 6:00 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Multi-layer stackup design

 

Hi!

 

We are designing an AC-DC power supply on a 4 layer board and we are
currently looking at any literature on how to design the stack-up.  

 

Some of our primary and secondary tracks overlap and we were told that
we can let them overlap as long as we use 3 prepeg layers in between.
Unfortunately, we cannot find any info on the minimum allowed thickness
of the 3 layers.  

 

We are concerned with the thickness since we will be using a 1.6mm 4
layer FR4 board with 2 Oz copper on all layers.  

 

JM

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