From an aluminum IMS board to its heat sinkA conventional insulated metal substrate separates circuit copper from the aluminum base. DBC on ceramic is a different technology.From an aluminum IMS board to its heat sinkConceptual cross-section; thicknesses and proportions are illustrativeCircuit copperInsulating thermal dielectricAluminum baseExternal thermal interfaceHeat sink / mechanical systemThe base spreads heat; the dielectric and external interfaces remain part of the path.³Ô¹Ïtv · Engineering explanation · Conceptual, not to scale