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

Claim 11:
12. A manufacturing method of a semiconductor device, the semiconductor device comprising:
a semiconductor chip;
an aluminum-containing aluminum electrode provided on the semiconductor chip;
a gold-coated or silver-coated external electrode provided outside the semiconductor chip; and
a bonding wire connecting the aluminum electrode and a surface of the external electrode, in which
the bonding wire is made of a palladium-coated copper bonding wire including: a core material containing copper as a main component; and a palladium layer on the core material and containing a sulfur group element,
the palladium-coated copper bonding wire in which with respect to a 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 5 mass ppm or more and 50 mass ppm or less,
the manufacturing method comprising:
forming a free air ball at a tip of the palladium-coated copper bonding wire and ball bonding the palladium-coated copper bonding wire to the aluminum electrode via the free air ball, and thereby, forming, near a bonding surface of the ball bonding on the electrode, a wire bonding structure including a palladium-concentrated bonding region with the concentration of palladium being 2.0 mass % or more relative to the total of aluminum, copper, and palladium;
and thereafter, second bonding a portion of the palladium-coated copper bonding wire apart from the free air ball by the length of the bonding wire to the surface of the external electrode.