Active solid-state devices (e.g. – transistors – solid-state diode – Encapsulated
Reexamination Certificate
2000-08-25
2003-06-10
Thomas, Tom (Department: 2811)
Active solid-state devices (e.g., transistors, solid-state diode
Encapsulated
C257S678000
Reexamination Certificate
active
06577018
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to semiconductor mounting packages. More particularly, it pertains to reducing bow for a semiconductor mounting package.
BACKGROUND OF THE INVENTION
Integrated circuits include packaging which houses sensitive semiconductor components. The semiconductor components, and their packaging, are being produced with diminishing geometries such that an electronic circuit board with increased density can be produced. As the packaging is produced, often the parting line formed during the overmolding process is offset from the center of the packaging, resulting in an imbalance of the molding compound on either side of the parting line. As the molding compound is cured, the imbalance of compound causes the package to bow. As the geometries diminish, the imbalance of compound becomes greater, resulting in increasing bowing effect. One solution to reduce the amount of bowing is to reduce the entire thickness of the entire packaging. However, this was not effective in reducing bow and results in weaker components which can chip and crack during the trimming and forming of the leadframe. In addition, this can result an increased chance of inadvertently exposing the semiconductor component to the environment.
Accordingly, what is needed is packaging for an integrated circuit device which does not experience significant bow during the forming process. What is also needed is a package for an integrated circuit device which can be easily incorporated into current manufacturing processes without damage to the packaging.
SUMMARY OF THE INVENTION
An integrated circuit device includes a semiconductor component coupled with a lead frame, and an integrated circuit package encompassing at least a portion of the semiconductor component. The integrated circuit package has a first surface and a second surface, and side surfaces, where the first surface is opposite the second surface. The integrated circuit has a parting line disposed on the side surfaces, where the parting line is offset toward a second surface of the integrated circuit package. The parting line and the first surface define a first portion of the integrated circuit package, where the first portion has a first volume of material. The parting line and the second surface define a second portion of the integrated circuit package, the second portion having a second volume of material, where the first volume is substantially the same as the second volume.
Other options for the integrated circuit device include as follows. For instance, the first surface of the integrated circuit package includes at least one recessed area. Alternatively, the first surface includes two or more recessed areas, and each recessed area is substantially identical to each other. In another option, at least one recessed area has a rectangular shape, and optionally the rectangular shape is defined in part by four corner portions, and at least one of the corner portions is curved. The recessed area, in one embodiment, extends fully from a first side surface of the integrated circuit package to a second side surface of the integrated circuit package. In another embodiment, each recessed area extends partially from a first side surface of the integrated circuit package to a second side surface of the integrated circuit package, and a border of integrated circuit package material extends around a perimeter edge of the first surface.
In another embodiment, an integrated circuit device includes a semiconductor component coupled with a lead frame, and an integrated circuit package encompassing at least a portion of the semiconductor component. The integrated circuit package has a first surface and a second surface, and side surfaces, where the first surface is opposite the second surface. The integrated circuit has a parting line disposed on the side surfaces, where the parting line is offset toward a second surface of the integrated circuit package. The first surface comprises a non-planar surface and the second surface is a uniform planar surface.
In one option, the parting line and the first surface define a first portion of the integrated circuit package, where the first portion has a first volume of material. The parting line and the second surface define a second portion of the integrated circuit package, the second portion having a second volume of material, where the first volume is substantially the same as the second volume. For instance, the first surface of the integrated circuit package includes at least one recessed area. Alternatively, the first surface includes two or more recessed areas, and each recessed area is substantially identical to each other. In another option, at least one recessed area has a rectangular shape. The recessed area, in one embodiment, extends fully from a first side surface of the integrated circuit package to a second side surface of the integrated circuit package. In another embodiment, each recessed area extends partially from a first side surface of the integrated circuit package to a second side surface of the integrated circuit package, and a border of package material extends around a perimeter edge of the first surface. In yet another embodiment, the lead frame has an alignment portion, and the alignment portion has at least one alignment cut out therein.
In yet another embodiment, an integrated circuit device includes a semiconductor component coupled with a lead frame, and an integrated circuit package encompassing at least a portion of the semiconductor component. The integrated circuit package has a first surface and a second surface, and side surfaces, where the first surface is opposite the second surface. The integrated circuit has a parting line disposed on the side surfaces, where the parting line is offset toward a second surface of the integrated circuit package. The first surface has two or more recessed areas, where optionally each recessed area is substantially identical.
In another embodiment, an integrated circuit device includes a semiconductor component coupled with a lead frame, and an integrated circuit package encompassing at least a portion of the semiconductor component. The integrated circuit package has a first surface and a second surface, and side surfaces, where the first surface is opposite the second surface. The integrated circuit has a parting line disposed on the side surfaces, where the parting line is offset toward a second surface of the integrated circuit package. The first surface having at least one recessed area, wherein the at least one recessed area is at least partially surrounded by a perimeter edge of material. Optionally, the perimeter edge has a width of about 0.75 mm, or alternatively a width of about 1.5 mm.
Alternatively, in another embodiment, an integrated circuit device includes a semiconductor component coupled with a lead frame, and an integrated circuit package encompassing at least a portion of the semiconductor component. The semiconductor component, and optionally the area adjacent thereto, define a die area having a first thickness. The integrated circuit package has a first surface and a second surface, and side surfaces, where the first surface is opposite the second surface. The integrated circuit has a parting line disposed on the side surfaces, where the parting line is offset toward a second surface of the integrated circuit package. At least a first area is defined by the first surface without the die area, and the first area has a second thickness, where the second thickness is less than the first thickness. Optionally, the first area completely surrounds the die area.
In one embodiment, an integrated circuit device includes a semiconductor component coupled with a lead frame, and an integrated circuit package encompassing at least a portion of the semiconductor component. A surface of the semiconductor component, and optionally a surface of the area adjacent thereto, define a die area surface. The integrated circuit package has a first surface and a second surface, and side surfaces, where the first
Baerlocher Cary J.
Schwab Matt E.
Tandy William D.
Micro)n Technology, Inc.
Owens Douglas W.
Thomas Tom
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