Semiconductor device

A semiconductor device having a wire loop shape configured with a wire to bond a first bonding point and a second bonding point, the semiconductor device comprising:

• a bonded ball formed on the first bonding point to bond an initial ball, the initial ball being formed at the leading end of the wire, by means of a capillary;
• a plurality of kinks formed at a plurality of points on the wire, after forming the bonded ball, by pushing the wire obliquely downward by causing the capillary to perform a rising and arc-wise lowering movement sequentially repeated several times in such a manner that the capillary is raised substantially vertically and subsequently moved toward the second bonding point along an arc having a radius equivalent to the previously raised distance of the capillary while lowering the capillary obliquely toward the second bonding point by a distance smaller than the previous raised distance of the capillary;
• and
• a second bonded portion formed in such a manner that, after obliquely pushing the wire downward at the plurality of points, the capillary is raised and subsequently moved to the second bonding point,
• wherein wire loop extends slightly downward with respect to a horizontal direction from the upper face of the bonded ball toward the second bonding point in a wave-like shape so as to protrude downward at each kink point and to protrude upward between the respective kinks, the bottom face of the wire protruding downward located between the first kink and the second kink is positioned at a plane higher than a plane including the first bonding point as viewed from the first bonding point,
• wherein, in the rising and arc-wise lowering movement, a first rising distance of the capitally is larger than a second rising distance of the capillary,
• wherein, in the rising and arc-wise lowering movement, the arc-wise movement of the capillary is made about the end point of the previous rising and arc-wise lowering movement of the capillary,
• wherein, in the rising and arc-wise lowering movement, the central angle of the first arc-wise movement of the capillary is larger than the central angle of the second arc-wise movement of the capillary, and
• wherein the length of the wire located between the first bonding point and the first kink is longer than the length of the wire located between the first kink and the second kink as viewed from the first bonding point.