Patent ID: 7049214

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: (a) providing a wiring substrate having a plurality of second electrode pads formed over a main surface thereof; (b) mounting a semiconductor chip over the wiring substrate, the semiconductor chip having over a main surface thereof a plurality of first electrode pads formed as exposed areas of a metallic film which contains aluminum (Al) as a main component; and (c) connecting the first electrode pads and the second electrode pads with each other through electrically conductive wires which contain gold (Au) as a main component, the step (c) comprising the steps of: (c1) melting over the first electrode pads one ends of the electrically conductive wires and bonding the resulting melted balls over the first electrode pads; (c2) bonding opposite ends of the electrically conductive wires over the second electrode pads; and (c3) forming the electrically conductive wires having ball portions formed over the first electrode pads, bonded portions formed over the second electrode pads, and wire portions for connecting the ball portions and the bonded portions with each other, the ball portions being bonded to the first electrode pads through an alloy layer of Al and Au, (d) wherein palladium (Pd) is contained in the electrically conductive wires, and (e) wherein the step (c1) is carried out in a state in which the temperature of the main surface of the semiconductor chip is not higher than 200° C.