Polymer encapsulated electrical devices

An overmolded electrical component, comprising:

• a circuit board substrate having an electrical circuit;
• a semi-conductor chip overlying the substrate and spaced apart therefrom by a distance of about 10 micrometers to about 150 micrometers, thereby creating a space between the circuit board substrate and the semi-conductor chip;
• solder interconnections located within the space and connecting the electrical circuit to the semiconductor chip;
• and
• a polymeric overmolding encapsulating the semi-conductor chip on the substrate and filling the space between the semi-conductor chip and the substrate about the solder interconnections, said polymeric overmolding being composed of a polymeric composite including a synthetic resin matrix and inorganic filler particles substantially uniformly distributed in the synthetic resin matrix, the inorganic filler particles having a platelet structure defined by opposite substantially flat and substantially parallel faces and being characterized by a dimensions between about 1 and 700 nanometers, the inorganic filler particle content being 20 percent or less by weight based on the weight of the polymeric composite.