Patent ID: 8207608

Claim:
A semiconductor device with an active surface, the semiconductor device comprising: at least a connecting element disposed on the active surface; at least a bump disposed on the connecting element and electrically connected to the active surface by the connecting element, wherein the bump comprises a pillar part disposed on the connecting element and a top part disposed on the top of the pillar part, the pillar part has a coplanar first dimension and a second dimension for defining a uniform cross-sectional area parallel to the active surface, the first dimension is longer than 1.2 times the second dimension, the top part will melt under a pre-determined temperature, and the pillar part will not melt under the pre-determined temperature; wherein the material of the pillar part is selected from a group consisting of copper (Cu), gold (Au), nickel (Ni) or a combination thereof, and the top part is composed of solder consisting of tin (Sn), copper (Cu), silver (Ag), lead (Pb) or a combination thereof and extending from the top of the pillar part.