The most important heavy copper PCB design guide and DFM (design for manufacturing) is the line width and line space for heavy copper PCB, meanwhile the DFM (design for manufacturing) is very important for heavy copper PCB because most of PCB design guides will not meet heavy copper PCB. Lots PCB supplier can manufacture PCB with 3 mil ~ 4mil line width and line space as min trace/space, but it is not meet the requests of heavy copper PCB, 3 mil circuit line width is always for 0.5 OZ or 1 OZ copper layer on PCB, but not for heavy copper PCB (3 OZ ~ 20 OZ copper PCB), you know PCB manufacturer can't do 3 mil line line space for 20 OZ PCB, this is why PCB designer have to consider the DFM.
A) Line Space & Line Width on heavy copper PCB
When design the board, you should consider relationship between Minimum line space (refers to Min LS later) and Minimum line width (refers to Min LW later). And to have a bigger value will make the board easier to be made.
B) Min Plated Through Hole (PTH) Diameter
C: Wall copper thickness for PTH: Normal: 20um-25um, and Max 2-5OZ (50-100um).
D) Max layers: For heavy copper, max layers we can make is 10L.
Board thickness should be >1.6mm for 20OZ copper.
E): Max board size: 400x300mm is the most economical. Bigger size (500x500mm) also workable but cost will be much higher.
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