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28.06.2017
What are the dependencies for multilayer PCB thickness values and their tolerances?

What are the dependencies for multilayer PCB thickness values and their tolerances?

The base thickness of laminate for multilayer PCB normally includes the total thickness of the core(s) with base copper foils: external and internal.   The maximum allowable tolerance for the final laminate thickness is ±10%. precise PCB final thickness with tolerance results from: prepregs thickness – average ±0.007 mm; core thickness described in tab. 1; process – typically ±0.03 mm. Core thickness [mm] Tolerance [mm] 0.10 ±0.01 0.20 ...