Patent ID: 8410605

Claim:
An integrated circuit (IC), comprising: a plurality of solder bumps, each solder bump having a surface; a semiconductor portion; a UBM layer disposed between the solder bumps and the semiconductor portion and including a plurality of under-bump metal (UBM) pads and a UBM field; wherein each UBM pad is disposed between a respective one of the solder bumps and the semiconductor portion, and the UBM pad has a contact perimeter formed with the respective solder bump, wherein each UBM pad extends over a passivation layer, over a protective layer, and beyond the contact perimeter a sufficient distance to block alpha particles emitted from the surface of the solder bump from causing an upset event in the semiconductor portion; and wherein the UBM field is separated from each UBM pad by a gap extending from the UBM pad to the UBM field so as to electrically isolate the UBM field from the UBM pad; and a solder mask layer on each UBM pad that defines a contact aperture having the contact perimeter.