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Overmolded semiconductor device having solder ball and edge lead connective structure

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TLDR
In this paper, a low-cost manufacturing method is used to fabricate a small multiple chip semiconductor device (10), in which a first pattern of conductive traces (14) is formed on one surface of a substrate (12), and a second pattern of traces (16) is created on a second surface of the substrate(12).
Abstract
A low cost manufacturing method is used to fabricate a small multiple chip semiconductor device (10). In one embodiment, a first pattern of conductive traces (14) is formed on one surface of a substrate (12), and a second pattern of traces (16) is formed on a second surface of the substrate (12). A first semiconductor die (20) is interconnected to the first traces (14), and a package body (24) is formed around the first die and a portion of the traces. A second semiconductor die (26) is interconnected to the second traces (16) on the second surface. A second package body (28) is formed around the second die and a portion of the traces (16). Solder balls (32) are coupled to exposed portions of the second traces (16) around the perimeter of the package body (28) to establish external power and ground connections to each die. Edge leads (36) are externally soldered to the traces (14 & 16) around the periphery of the substrate (12) to establish remaining electrical connections.

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References
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Patent

Semiconductor device having stacking structure

TL;DR: A semiconductor device includes a base semiconductor structure including semiconductor elements, interconnection layers for connecting the semiconductor element together, and conductive pads to which the interconnection layer is connected as discussed by the authors.
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Flat package for integrated circuit devices

TL;DR: In this paper, a flat package for at least one integed circuit device having output pads comprises a supporting member for the IC device, a plurality of output terminals external to the package, an array of conductors connecting the output terminals to the said output pads of the device, and a protective means.
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TL;DR: A baseboard for orthogonal mounting of integrated circuit chips is described in this article, where a number of contact pads are formed adjacent each channel and are solder bonded to corresponding chip conductor pads.
PatentDOI

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Edge-mounted, surface-mount package for semiconductor integrated circuit devices

TL;DR: A flat package for semiconductor integrated circuit devices allows edge-mounting and surface-mount The package may be molded plastic containing a semiconductor chip, and flat leads extend from one edge of the package to provide an area to solder to conductors on a PC board Mechanical positioning, mechanical support and spacing are provided by studs extending from the edge of a package adjacent the leads as discussed by the authors.