The present invention relates generally to semiconductor packaging, and more specifically, to a semiconductor package having top-surface grid array terminals for mounting another semiconductor package.
Semiconductor packages that provide mechanical mounting and electrical interconnection of a semiconductor die are commonly provided in ball grid array and land grid array configurations. A semiconductor die is electrically connected to a substrate with a grid array terminals disposed on the “bottom” side of the semiconductor package and solder balls are attached for connection to a system substrate, typically a printed circuit board (PCB) having lands located to attach the solder balls of the semiconductor package (referred to as ball grid array or BGA attach). Alternatively, conductive paste, a socket or “interposer” may be used to provide contacts between lands of the semiconductor package and lands on the system substrate (referred to as land grid array or LGA connection).
Typical system interconnect of grid array type packaging is generally two-dimensional. That is, multiple grid array devices are mounted on a PCB in different locations along the surface of the PCB and interconnected via circuit traces on or within the PCB. Such mounting is suitable for small, thin assemblies, but when the area of a PCB is of concern in a design, or in systems where other components are much taller than the semiconductor packages are present, it would be desirable to require less circuit board area by stacking semiconductor packages.
Specific semiconductor packages used for implementing three-dimensional stacked packages are well known in the art. However, such packaging is typically not compatible with existing integrated circuit packages, so that two or more integrated circuits that are “stacked” must all be designed for stacking.
Also, when combining multiple semiconductor packages in an assembly, at times it is advantageous to permit removal of at least of one semiconductor package, so that when one semiconductor package is used with one of multiple alternative other semiconductor packages in a three-dimensional configuration, the interconnect between a semiconductor package may be standardized and so that one of the semiconductor packages may be removed and replaced without removing the other.
Therefore, it would be desirable to provide a semiconductor package that facilitates stacking of grid arrays and a method of manufacturing such a semiconductor package. It would further be desirable to provide such a package that provides mounting of another grid array or other semiconductor package that is removable and that may be interchangeably standardized.
The above objectives are accomplished in a semiconductor package having terminals on the semiconductor package top surface for mounting and electrically connecting to terminals of a piggybacked semiconductor package and method for manufacturing the semiconductor package. The semiconductor package includes a semiconductor die mounted on a substrate and an encapsulation covering the semiconductor die and at least the top surface of the substrate. Multiple terminals are provided on a top surface of the encapsulation for attachment of the piggybacked semiconductor package, which may be a standard ball grid or land grid array package.
The top-surface terminals may be top surfaces of vias formed through the encapsulation by laser-ablation or other mechanism and filled with conductive paste or a low melting-temperature alloy or plated. The vias may have a conical profile to improved plating uniformity. The vias may terminate on the substrate circuit pattern, on electrical terminals on the top surface of the semiconductor die, or may pass through the encapsulation and the substrate to provide lands for bottom-side terminals.
The invention, as well as a preferred mode of use and advantages thereof, will best be understood by reference to the following detailed description of illustrative embodiments when read in conjunction with the accompanying drawings, wherein like reference numerals indicate like parts throughout.
The present invention concerns a semiconductor package and a method for manufacturing a semiconductor package that provide for top mounting of another semiconductor package in a “piggyback” configuration. While the exemplary embodiments depict ball grid array packages mounted atop a plurality of lands on the top side of a modified semiconductor package, it should be understood by those skilled in the art, that the techniques of the present invention can be extended to other types of semiconductor interconnects.
Referring now to
Semiconductor package 10A includes a die 16 mounted to a substrate 14A that includes lands 18 to which solder ball terminals may be attached or that may be connected with a conductive paste to form a LGA mounted semiconductor package. Encapsulation 12A surrounds die and substrate 14A, although substrate 14A may alternatively be exposed on a bottom side of semiconductor package 10A. Electrical connections 15 of die 16 are connected to circuit patterns 17 on substrate 14A via wires 19, but the type of die mounting is not limiting, but exemplary and other die mounting types may be used such as flip-chip die mounting. Additionally, while substrate 14A is depicted as a film or laminate-type mounting structure, lead frame and other substrate technologies may be used within the structures of the present invention.
Referring now to
The next type of via hole is provided by laser-ablating through encapsulation 12A to reach circuit pattern 17 to that connection may be made through substrate 14A circuit patterns to die 16 electrical terminals, to lands 18 or both. The last type of via is provided by laser-ablating through encapsulation 12A to reach electrical connections 15 of die 16 so that direct connection to the circuits of die 16 can be made from a piggybacked semiconductor package. Each of via holes 22A, 22B and 22C is depicted as a via hole having a conical cross-section, which is desirable for providing uniform plating current density during a plating process. However, via holes 22A, 22B and 22C may alternatively be made cylindrical in shape if the advantage of cylindrical cross-section is not needed, for example if a conductive paste is used to fill the via holes.
Referring now to
Referring now to
Referring now to
Referring now to
Referring now to
In addition to the die electrical connection interface depicted in
The above description of embodiments of the invention is intended to be illustrative and not limiting. Other embodiments of this invention will be obvious to those skilled in the art in view of the above disclosure and fall within the scope of the present invention.
The present application is a divisional of U.S. patent application “SEMICONDUCTOR PACKAGE INCLUDING TOP-SURFACE TERMINALS FOR MOUNTING ANOTHER SEMICONDUCTOR PACKAGE”, Ser. No. 11/595,411, filed on Nov. 9, 2006, which is a divisional of U.S. patent application “METHOD OF MANUFACTURING A SEMICONDUCTOR PACKAGE”, Ser. No. 10/806,640, filed on Mar. 23, 2004, now U.S. Pat. No. 7,185,426, issued Mar. 6, 2007, which is a continuation-in-part of U.S. patent application “INTEGRATED CIRCUIT SUBSTRATE HAVING LASER-EMBEDDED CONDUCTIVE PATTERNS AND METHOD THEREFOR”, Ser. No. 10/138,225 filed on May 1, 2002, now U.S. Pat. No. 6,930,256, issued Aug. 16, 2005, by at least one common inventor and assigned to the same assignee. The specifications of the above-referenced Patent Applications are herein incorporated by reference.
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Number | Date | Country | |
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Parent | 11595411 | Nov 2006 | US |
Child | 12655724 | US | |
Parent | 10806640 | Mar 2004 | US |
Child | 11595411 | US |
Number | Date | Country | |
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Parent | 10138225 | May 2002 | US |
Child | 10806640 | US |