ABSTRACT

SELECTIVE ETCH: Restricting the etching action on a pattern by the use of selective chemical which attack only one of the exposed materials. SELF-HEATING: Generation of heat within a body by chemical action. Epoxy materials self-heat in curing due to exothermic reaction. SELF-PASSIVATING GLAZE: The glassy material in a thick-film resistor that comes to the surface and seals the surface against moisture. SEMIADDITIVE PROCESS: An additive conductive patterning process combining electroless metal deposition on an unclad or foil substrate with electroplating, with etching, or with both. SEMICONDUCTOR CARRIER: A permanent protective structure which provides for mounting and for electrical continuity in application of a semiconductor chip to a major substrate. SEMICONDUCTORS: Solid materials such as silicon that have a resistivity midway between those of a conductor and a resistor. These materials are used as substrates for semiconductor devices such as transistors, diodes, and integrated circuits.