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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