MULTILAYERED SOLDER SEALED BAND FOR SEMICONDUCTOR SUBSTRATE AND METHOD THEREOF

PROBLEM TO BE SOLVED: To enable a solder sealed band to apply to an inequality with a large expansion between a cover and a substrate by a method wherein the solder sealed band is formed, by laminating first and second solder interconnect layers and a high-melting point solder core holding the solder core between the first and the second solder interconnect layers. SOLUTION: A solder sealed band is formed into a structure, wherein a first solder interconnect layer 41 is provided on the surface on one side of the surfaces of a high-melting point solder core 43 and at the same time, a second solder interconnect layer 45 is provided on the other surface of the core 43 to make lower the melting point of the layer 41 than that of the layer 45, and, moreover, the melting points of the layers 41 and 45 are made lower than that of the core 43. As a result, the band can apply to an inequality with a large expansion between a cover 20 under use and a substrate 10, it becomes possible to maintain the reliability of a hermetic sealing of the band, and the reprocessable degree of the band and the thermal performance of a package can be modified.