Patent ID: 7518205
Filing Date: 2009-04-14
Classification: H01L,H01S

Abstract:
1. A semiconductor package comprising: a semiconductor device requiring airtightness which is disposed on a substrate; a plurality of leads fixed to said substrate by hermetic sealing; and a sealing cover bonded to said substrate through a seal ring, wherein: said substrate is made of a metal alloy selected from the group including tungsten-copper alloys, tungsten-silver alloys, molybdenum-copper alloys and molybdenum-silver alloys; material for said hermetic sealing is directly bonded to said substrate without an intervening nickel plating layer therebetween to fix said plurality of leads to said substrate; said seal ring is bonded to said substrate by brazing without an intervening nickel plating layer therebetween; and surfaces of said leads after said hermetic sealing and a surface of said seal ring after said brazing are nickel plated and gold plated.