Semiconductor package having substrate with multi-layer...

Active solid-state devices (e.g. – transistors – solid-state diode – Housing or package – Housing or package filled with solid or liquid electrically...

Reexamination Certificate

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C257S723000, C257S737000, C257S762000, C257S766000, C257S774000, C257S777000, C257S778000, C257S787000

Reexamination Certificate

active

10023049

ABSTRACT:
A semiconductor package includes a substrate formed of a board material, a semiconductor die bonded to the substrate, and an encapsulant on the die. The package also includes an array of external contacts formed as multi layered metal bumps that include a base layer, a bump layer, and a non-oxidizing outer layer. The external contacts are smaller and more uniform than conventional solder balls, and can be fabricated using low temperature deposition processes, such that package warpage is decreased. Further, the external contacts can be shaped by etching to have generally planar tip portions that facilitate bonding to electrodes of a supporting substrate. Die contacts on the substrate can also be formed as multi layered metal bumps having generally planar tip portions, such that the die can be flip chip mounted to the substrate. A method for fabricating the package includes the step of depositing the different layers for the metal bumps using electroless and electrolytic deposition, and then etching the different layers to shape the metal bumps.

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