Patent ID: 9449900
Filing Date: 2016-09-20
CPC Classification: H01L

Claim Text:
1. A leadframe device comprising: a leadframe having a top surface; a plurality of support features disposed on the top surface of the leadframe, wherein the plurality of support features comprise a material different from the leadframe and are configured to support a flip-chip semiconductor die, the plurality of the support features are also configured as bump balls reflowed to the top surface of the leadframe; the flip-chip semiconductor die comprising a plurality of connector bumps coupled to the top surface of the leadframe, the plurality of connector bumps each disposed inline between a bottom surface of the semiconductor die and the top surface of the leadframe wherein each of the plurality of support features has a height less than a height of each of the plurality of connector bumps, and each of the plurality of connector bumps comprises a material that melts during a reflow process and each of the plurality of support features comprises a different material than the plurality of connector bumps and that maintains a specific height during the reflow process in a case of improper collapse of one or more connector bumps, wherein the material of each of the plurality of support features has a higher liquidus temperature than the material of the connector bumps; and a coating material covering at least a portion of the top of each support feature, but not the bottom of each support feature, wherein the coating material is a plating material, and wherein the plating material is selected from the grow consisting of: silver, nickel, palladium, and gold.