High power electronic applications in the automotive industry require interconnecting substrates that have high reliability, high thermal conductivity, high current capability, multi-Iayer potential, and small size. This paper addresses the design requirements for automotive power substrates and how ever increasing demands are challenging the current substrate technology. Four different substrate material types, with various design features, capable of meeting these stringent requirements are described. The current study focused on assessing the thermal performance capabilities of four different substrate constructions: 1) thick-film on alumina, 2) LTCC, 3) insulated stainless steel and 4) anodized aluminum. Thermal impedance testing of each substrate along with design variations to enhance thermal capability was completed. The results of the thermal testing are compared based on appropriate application of the substrate technology.


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