Semiconductor device attached to island having protrusion
View Patent ↗When a metal ribbon is ultrasonic-bonded, a peripheral area of an island and hanging pins provided in the periphery of the island need to be clamped by use of clampers of a bonder to prevent the island from being lifted up. However, if no sufficiently-wide peripheral area of the island can be secured or no hinging pins can be provided due to the miniaturization of the device, there arises a problem that the island cannot be clamped. A protrusion, which protrudes toward a lead and has the same height as an end portion of the lead, is provided to an edge of the island opposed to the lead. Accordingly, when the protrusion and the end portion of the lead are simultaneously pressed by the damper, it is possible to prevent the island from being lifted up even when no hanging pin or no clamp area around the island is provided.
1. A semiconductor device comprising:
a semiconductor element comprising an electrode disposed on a principal surface of the semiconductor element;
an island to which the semiconductor element is attached;
a first lead separated from the island so that, in plan view of the semiconductor device, an edge of the first lead faces an edge of the island;
a first protrusion that, in the plan view, is contiguous with and protrudes from the edge of the island toward an extrapolation of the edge of the first lead; and
a metal ribbon comprising a first end attached to the electrode of the semiconductor element and a second end attached to the first lead.
2. The semiconductor device of claim 1 , wherein, in the plan view, the first protrusion extends beyond the extrapolation of the edge of the first lead.
3. The semiconductor device of claim 2 , further comprising a metal plated layer disposed on at least the first protrusion and part of the first lead near the edge of the first lead.
4. The semiconductor device of claim 1 , further comprising a second protrusion protruding from the first lead toward the first protrusion along the extrapolation of the edge of the first lead.
5. The semiconductor device of claim 1 , further comprising a second lead disposed adjacent the first lead and separated from the island so that, in the plan view, an edge of the second lead faces an edge of the first protrusion.
6. The semiconductor device of claim 1 , further comprising another metal ribbon, another first lead to which the another metal ribbon is attached, and another first protrusion corresponding to the different metal ribbon.