Patent ID: 9543266
Date: 2017-01-10
CPC Classifications: B21C,C22C,C22F,H01L

Claim:
1. Bonding wire for semiconductor device use with an Ag content of 90 mass % or more, wherein, in a wire center cross-section, which is a cross-section containing the wire center and parallel to the wire longitudinal direction, there are no crystal grains with a ratio a/b of a long axis “a” and a short axis “b” of 10 or more and with an area of 15 μm when measuring a crystal direction in the wire longitudinal direction in said wire center cross-section, the ratio of crystal direction <100> with an angle difference with respect to said wire longitudinal direction of 15° or less is, by area ratio, 10% to less than 50%, and when measuring a crystal direction in the wire longitudinal direction at the wire surface, the ratio of crystal direction <100> with an angle difference with respect to said wire longitudinal direction of 15° or less is, by area ratio, 70% or more.