Patent ID: 7830008
Filing Date: 2010-11-09
Classification: B23K,C22C,C22F,H01L

Abstract:
1. A bonding wire for connecting a semiconductor chip to an external metal terminal, said bonding wire consisting essentially of 0.0004 mass % to 0.02 mass % of praseodymium, 0.0003 mass % to 0.006 mass % of indium, 0.0002 mass % to 0.02 mass % of calcium, with the balance gold, wherein the content of praseodymium constitutes, by mass ratio, 15% or more of the total content of calcium and praseodymium, and wherein in any cross-section in the bonding wire, number of pieces of precipitates comprising 10 atomic % or more of rare earth element and the balance being gold having a length of 0.5 μm or more is 10/mm 2 or less.