Patent ID: 8115319

Claim:
A flip chip package comprising: a chip with a plurality of bumps and at least an extruded alignment key disposed on an active surface of the chip; a substrate having a plurality of bonding pads and at least an alignment base where the alignment base has a concaved alignment pattern corresponding to the extruded alignment key; when the chip is disposed on the substrate, the extruded alignment key is embedded into the concaved alignment pattern in a manner that the bumps are accurately aligned to the bonding pads; and a plurality of solder bonding materials soldering the bumps to the corresponding bonding pads; wherein the bumps are metal pillars without changing their shapes during reflow processes to form a MPS-C2 package; wherein the combination height of the extruded alignment key embedded into the alignment base is not less than the height of the bumps so that a gap is maintained between the bumps of the chip and the bonding pads of the substrate; wherein the alignment base is a protrusive component disposed on the substrate.