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March 2007

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Subject:
From:
"Pasquito, Helena" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Pasquito, Helena
Date:
Wed, 28 Mar 2007 14:38:24 -0400
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Hello All,

 

We have a customer designed PCB that we're trying to understand better.
It is a mixed dielectric board with .030" of Taconics material attached
to approx .050" of FR-4.

 

Currently the vias in the board in question are drilled to .014" and
then plated per Class III, .001" min Cu with a subsequent Au flash.  We
understand aspect ratios of 1 to 10 or less is okay for single medium
PCB's. 

 

The question we have is in regard to the proper aspect ratio for vias
when used in mixed mediums.  Any information you can forward would be
much appreciated.

 

Regards,

Helena 

 

Helena Pasquito

Manufacturing Skills Instructor

M/A-COM, Tyco Electronics

1011 Pawtucket Blvd., M/S 107

Lowell, MA 01853

978-442-5024

[log in to unmask] <mailto:[log in to unmask]> 

 


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