Patent ID: 7239025

Claim:
An apparatus comprising: a support; a plurality of leads extending from the support; a command link coupled to at least one of the leads; a plurality of data links, wherein each of the data links is coupled to at least one of the leads; and a dynamic random access memory device contained on the support and coupled to the command link, wherein the dynamic random access memory device comprises: an array of memory cells; a metal pattern line coupled to the array of memory cells; a metal contact pad coupled to the metal pattern line; and a solder ball contact coupled to the metal contact pad, wherein the solder ball contact is formed by a method comprising: forming an insulating layer on the metal contact pad; removing a portion of the insulating layer to expose a portion of the metal contact pad, thereby forming an exposed portion of the metal contact pad; depositing solder on the exposed portion of the metal contact pad using selective deposition, thereby forming a solder contact; and annealing the solder contact to form a solder ball contact.