Patent ID: 7517787

Claim:
A method, comprising: fabricating a die bump on a die, the die bump being shaped and dimensioned to at least reduce the flow of solder material, used to attach the die bump to a package substrate, towards an under bump metallurgy (UBM) layer located below the die bump, wherein the die bump has a frusto-conical shape located above the die and extending beyond a topmost surface of the die, wherein a distal end of the frusto-conical shape is located away from the UBM layer and is remote from a near end of the frusto-conical shape, the near end of the frusto-conical shape being in contact with the UBM layer and wider than an opening in a passivation layer within which the UBM layer is formed wherein the distal end of the frusto-conical shape located away from the UBM layer has a wider cross-section than the near end of the frusto-conical shape.