Exposed copper area migration from EC to CD

In EC there is a field called "exposed copper area", which is probably important for determining the amount of gold needed in ENIG or other raw materials for other final finishes.

Right now it is calculated as a percentage, but the question then is: Percentage of what?

If the calculations are to be exact, plated holes and non-covered vias would also have to be  a part of the total surface area covered.

There is a field in CD called "coverage" for final finish, would it be a good idea to use this in conjunction with information on hole plating and type to determine  the total surface area and present this as an aggregate number? Could be available in the summary perhaps, but still keep the data sources as top, bottom and holes surface areas in CD.

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  • Elias Bakken  conversion from EC to Cd is an internal Elmatica issue, but having said that it is interesting  for CD forum as well how we calculate surface finish area, specially for gold and silver due to cost factor.   Today the exposed  copper area is calculated as percentage of the single PCB area. Andreas Lydersen can you confirm this? 

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