For ceramics, is it true the surface roughness can be different between DBC and DPC?

No.  The roughness of the copper surface is determined by the polishing process after plating. For some products with strict requirements on surface roughness (such as LED, Ra< 0.3um and Rz< 2um), our factory will use polishing equipment to treat the copper surface after plating to reach the requirements of low roughness. Therefore, the same roughness requirements can be achieved for both DPC and DBC processes.

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