Abstract:
An integrated circuit (IC) (200) includes a semiconductor material (102), electronic circuitry (104) formed on the semiconductor material (102), a contact layer (106) formed on the electronic circuitry (104), a final passivation layer (108) formed on the contact layer (106) and an under-bump metallurgy (UBM) (216) formed on at least a portion of the final passivation layer (108). The contact layer (106) includes a plurality of contacts pads (106A) for providing external access to the electronic circuitry (104). The final passivation layer (108) includes a plurality of windows that extend through the final passivation layer (108) to the contact pads (106A). The UBM (216) includes an aluminum layer having a thickness of about 800 angstroms to about 1200 angstroms, a nickel/vanadium (Ni/V) layer having a thickness of about 800 angstroms to about 1200 angstroms and a copper (Cu) layer having a thickness of about 800 angstroms to about 1200 angstroms.
Abstract:
An integrated circuit (IC) (200) includes a semiconductor material (102), electronic circuitry (104) formed on the semiconductor material (102), a contact layer (106) formed on the electronic circuitry (104), a final passivation layer (108) formed on the contact layer (106) and an under-bump metallurgy (UBM) (216) formed on at least a portion of the final passivation layer (108). The contact layer (106) includes a plurality of contacts pads (106A) for providing external access to the electronic circuitry (104). The final passivation layer (108) includes a plurality of windows that extend through the final passivation layer (108) to the contact pads (106A). The UBM (216) includes an aluminum layer having a thickness of about 800 angstroms to about 1200 angstroms, a nickel/vanadium (Ni/V) layer having a thickness of about 800 angstroms to about 1200 angstroms and a copper (Cu) layer having a thickness of about 800 angstroms to about 1200 angstroms.
Abstract:
A metal runner that improves the current-carrying capability of solder bumps used to electrically connect a surface-mount circuit device to a substrate. The runner comprises at least one leg portion and a pad portion, with the pad portion having a continuous region and a plurality of separate electrical paths leading to and from the continuous region. The electrical paths are delineated in the pad portion by nonconductive regions defined in the pad portion, with at least some of the nonconductive regions extending into the leg portion. The multiple electrical paths split the current flow to and from the solder bump, distributing the current around the perimeter of the solder bump in a manner that reduces current density in regions of the solder bump where electromigration is most likely.
Abstract:
A metal runner that improves the current-carrying capability of solder bumps used to electrically connect a surface-mount circuit device to a substrate. The runner comprises at least one leg portion and a pad portion, with the pad portion having a continuous region and a plurality of separate electrical paths leading to and from the continuous region. The electrical paths are delineated in the pad portion by nonconductive regions defined in the pad portion, with at least some of the nonconductive regions extending into the leg portion. The multiple electrical paths split the current flow to and from the solder bump, distributing the current around the perimeter of the solder bump in a manner that reduces current density in regions of the solder bump where electromigration is most likely.