Stmicroelectronics Gmbh

Rjr Polymers, Inc.

John Qiang Ni

Richard J Ross

Craig J Rotay

John W Roman

David DeWire

David Lam

Tony B Shaffer

Cynthia L Ross

A protective modular package assembly with one or more subassemblies, each having a base element, a sidewall element coupled to the base element, and a semiconductor device disposed within and coupled to the sidewall element and the base element; a protective modular package cover having fastening sections located at opposing ends of the cover, torque elements disposed on the opposing ends and configured to fasten the cover to a core, and subassembly receiving sections disposed between the fastening sections with each subassembly receiving section operable to receive a subassembly and having a cross member along the underside of the cover; and an adhesive layer configured to affix subassemblies to respective subassembly receiving sections. The torque elements are configured to transfer a downward clamping force generated at the fastening elements to a top surface of the subassemblies via the cross member of each of the one or more subassembly receiving sections.

Modular low stress package technology

A method of designing a desired modular package assembly: determining the configuration and dimensions of the assembly from received user input design data, the assembly having a protective modular package cover with first and second fastening sections, subassembly receiving sections disposed between the fastening sections and having a cross member formed along the underside of the protective modular package cover and configured to receive a subassembly, and one or more subassemblies to be received by the subassembly receiving sections; determining an adhesive deposition strategy for deposition of an adhesive layer to the cross members of the subassembly receiving sections sufficient to affix the top side of the subassemblies to the cross members on the underside of the subassembly receiving sections; and incorporating the configuration and dimensions of the modular package assembly and the adhesive deposition strategy into a manufacturing assembly process configured to manufacture the modular package assembly.

A method of designing a modular package: determining a package outline of a modular package assembly from package outline design data; determining seating plane and overall package length characteristics of the assembly from seating plane and package length design data; the design tool calculating minimum package height of the modular package assembly from the seating plane and package length design data; designing the dimensions and configuration of one or more subassemblies from subassembly design data; defining dimensions and configuration of a plurality of mechanical layers of a protective modular package cover given the defined package outline, the seating plane, overall package length, the minimum package height, and the subassemblies; defining an adhesive deposition strategy to join mechanical layers of the cover; designing the cover in accordance with the dimensions and configuration of the mechanical layers; and incorporating the assembly and the adhesive deposition strategy into a manufacturing assembly process.

A protective modular package cover has first and second fastening sections located at opposing first and second ends with one or more subassembly receiving sections disposed thereto and is configured to fasten the protective modular package cover to a core. Each fastening section has a foot surface located on a bottom surface of a fastening section and configured to make contact with the core, a mounting hole configured to receive a fastener, and a torque element. Each subassembly receiving section is configured to receive a subassembly and has a cross member formed along the underside of the protective modular package cover. Activation of the first torque element transfers a downward clamping force generated at the fastening element to a top surface of one or more subassemblies disposed in the one or more subassembly receiving sections via the cross member of each of the one or more subassembly receiving sections.

A method of manufacturing a protected package assembly: providing a protective modular package cover in accordance with a modular design; selectively applying an adhesive to the cross member of each subassembly receiving section of the protective modular package cover that will receive a subassembly to form an adhesive layer of the protective modular package cover; encapsulating the one or more subassemblies in the subassembly receiving sections on the selectively applied adhesive layer to generate a protected package assembly; and controlling application of a distributed downward clamping force applied to the top surfaces of the subassemblies received by the protective modular package cover and useful for mounting the protected package assembly to a core through activation of fastener elements and cross members of the subassembly receiving sections.

Electronic packages that consist of dies sealed within hollow plastic enclosures with electrically conductive leads penetrating the enclosure walls to access the die circuitry are manufactured by applying a heat-curable adhesive to the leads at only those locations where the surfaces of the leads will interface with the enclosure material, molding the package around the leads, and curing the adhesive during the molding process or during a post-cure. The adhesive is formulated to form a gas-tight seal around the leads and to maintain the seal during the thermal cycling that the components are exposed to during the typical procedures involved in manufacturing the packages and in making the electrical connections to other circuitry, as well as the typical environmental changes that the finished and installed product is exposed to during use. In particular, the adhesive is selected to accommodate differences in the coefficients of thermal expansion between the leads and the enclosure material while still maintaining a vapor-tight seal.

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Oakland, CA, United States of America

John Qiang Ni