Patent ID: 11876066
Assignee: TANAKA DENSHI KOGYO K. K.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  C | IPC H

Claim 3:
4. A palladium-coated copper bonding wire, comprising:
a core material containing copper as a main component; and
a palladium layer on the core material,, the palladium-coated copper bonding wire containing a sulfur group element, wherein
with respect to the total of copper, palladium, and the sulfur group element of the palladium-coated copper bonding wire, a concentration of palladium is 1.0 mass % or more and 4.0 mass % or less and a total concentration of the sulfur group element is 50 mass ppm or less, and a concentration of sulfur is 5 mass ppm or more and 12 mass ppm or less, a concentration of selenium is 5 mass ppm or more and 20 mass ppm or less, or a concentration of tellurium is 15 mass ppm or more and 50 mass ppm or less, and
when the palladium-coated copper bonding wire is ball bonded onto an aluminum electrode to fabricate a wire bonding structure, a palladium-concentrated bonding region with the concentration of palladium being 2.0 mass % or more relative to a total of aluminum, palladium, and copper is formed near a bonding surface of the ball bonding on the aluminum electrode.