Spansion Llc.

Advanced Micro Devices Corporation

Wong Kwet Nam

Sally Foong

Kevin Guan

Lai Nguk Chin

Foong Yue Ho

Sally Y L Foong

Kee Cheng Sim

Thor Lee Lee

Yue Ho Foong

Lim See-Kee

Koo Eng Luon

Tan Kiah Ling

A system and method for a thin multi chip stack package with film on wire and copper wire. The package comprises a substrate and a first die overlying the substrate. Copper wires electrically connect the first die to the substrate. A film overlies the first die and a portion of the copper wires. In addition, the film adheres a second die to the first die. The film also electrically insulates the copper wires from the second die.

Method and system for thin multi chip stack package with film on wire and copper wire

A method for die stacking is disclosed. In one embodiment a first die is formed overlying a substrate. A first wire is bonded to the first die and to a bond finger of the substrate, wherein the first wire is bonded to the bond finger with a first bond. A first stitch bump is formed overlying the first stitch bond, wherein the first stitch bump is formed from a molten ball of conductive material. A second die is formed overlying the first die. A second wire is bonded to the second die and to the first stitch bump, wherein the second wire is bonded to the first stitch bump with a second bond.

Stitch bump stacking design for overall package size reduction for multiple stack

Methods and systems of applying a plurality of pieces of die attach film to a plurality of singulated dice are provided. The method can involve making intervals between rows and columns of a plurality of pieces of die attach film. The interval can be made by expanding an underlaid expandable film on which the plurality of pieces of die attach film are placed or by removing portions of the die attach film between rows and columns of the plurality of pieces of die attach film. The method can further involve placing a plurality of singulated dice back side down on the plurality of pieces of die attach film.

Process applying die attach film to singulated die

Cassettes for holding thin semiconductor wafers for safe handling are provided, along with an improved methodology for reducing the thickness of semiconductor wafers. Embodiments include a cassette for holding thin semiconductor wafers, having a plurality of sets of center and edge supports, the sets being spaced from each other a distance greater than a sag amount of the wafers. The thin wafers are supported in a predetermined reference plane, so that tools such as robots or automatic handlers can be programmed to pick them up without damaging them. In another embodiment, a double into single pitch wafer cassette is provided having a wafer entrance section with spacing twice as large between sets of edge supports as a conventional cassette, to accommodate the sag/warp of the thin wafers, and a 'flattening section' which guides and flattens the wafers between opposing edge supports as they are pushed into the cassette, such that the wafers are held substantially planar. Because the wafers are held substantially planar, they can be safely removed from the cassette by automatic tools. A methodology is also provided for reducing the thickness of a semiconductor wafer, comprising grinding the back side of the wafer to reduce its initial thickness to an intermediate thickness, and plasma etching the back side of the wafer to reduce the intermediate thickness to a final thickness. The two-step grinding/etching process is faster and less expensive than conventional multi-step grinding/polishing processes, because it requires less steps, each step is accomplished relatively quickly, and it employs standard grinding and etching equipment, rather than expensive dedicated equipment.

Method and apparatus for handling thin semiconductor wafers

Growing community of inventors

Penang, Malaysia

Wong Kwet Nam