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June 2006

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TechNet <[log in to unmask]>
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TechNet <[log in to unmask]>
Date:
Wed, 14 Jun 2006 08:16:08 +0200
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TechNet E-Mail Forum <[log in to unmask]>, Ofer Cohen <[log in to unmask]>
Subject:
Odd layers count
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From:
Ofer Cohen <[log in to unmask]>
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Hello all, 
Due to constraints of PCB thickness and routing dead end I was requested
to approve odd layers count (19 metal layers). I checked the stack up -
it is completely symmetrical, except of the center line that is in metal
layer rather than in laminate or prepreg, as we are used to. Did anyone
experience a problem caused by the non symmetry of laminates versus
prepreg count? Is there availability problem of single-sided laminates?
The material is hi-Tg/hiTd regular FR 4.

Regards

Ofer Cohen

Director - Quality Assurance and Reliability

SIEMENS COM FN A SB

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