摘要:
A method of packaging a semiconductor chip assembly includes the encapsulation of the same after establishing an encapsulation area and providing a physical barrier for protecting the terminals of a chip carrier. An alternative or supplement to providing a physical barrier is to provide a preform of an encapsulation material which includes a predetermined volume of such material so that only the encapsulation area is filled. For a semiconductor chip assembly which does not yet have an elastomeric layer, a method of simultaneously forming such an elastomeric layer and encapsulating a semiconductor chip assembly is also provided.
摘要:
Semiconductor chip packages and methods of fabricating the same. The package includes a thermally conductive protective structure having an indentation open to a front side and a flange surface at least partially surrounding the indentation and facing to the front of the structure. A chip is disposed in the indentation so that the front surface of the chip, with contacts thereon, faces toward the front of the structure. A flexible dielectric film having terminals thereon is placed on the flange surface, and a compliant material is disposed between the film and the flange surface. The terminals on the film are connected to the contacts on the chip. The individual terminals on the film are movable with respect to the protective structure, which facilitates mounting and compensation for thermal expansion.
摘要:
A method of encapsulating a semiconductor device. The encapsulation method includes a semiconductor chip package assembly having a spacer layer between a top surface of a sheet-like substrate and a contact bearing surface of a semiconductor chip, wherein the substrate has conductive leads thereon, the leads being electrically connected to terminals on a first end and bonded to respective chip contacts on a second end. Typically, the spacer layer is comprised of a compliant or elastomeric material. A protective layer is attached on a bottom surface of the substrate so as to cover the terminals on the substrate. A flowable, curable encapsulant material is deposited around a periphery of the semiconductor chip after the attachment of the protective layer so as to encapsulate the leads. The encapsulant material is then cured. Typically, this encapsulation method is performed on a plurality of chip assemblies simultaneously.
摘要:
A compliant microelectronic mounting device. An area array of conductive contact pads are connected into rows by conductive leads on a first side of a flexible substrate. Each of the conductive leads bridges a bonding hole in the substrate which is situated between successive contact pads. Each of the conductive leads further has a frangible portion within or near each bonding hole. A plurality of compliant dielectric buttons, typically composed of an elastomer material, are attached to a second side of the substrate and typically positioned under each contact pad. The component may be attached to a microelectronic device having contacts so that a stand-off is created between the substrate and the device by the compliant dielectric buttons. The frangible portions allow the leads to be cleanly broken, bent and secured into electrical contact with opposed contact pads on the microelectronic device. Each of these connections may be supported by a compliant layer, typically an uncured elastomer which fills the area around the dielectric pads and is then cured.
摘要:
A method and an apparatus for providing a planar and compliant interface between a semiconductor chip and its supporting substrate to accommodate for the thermal coefficient of expansion mismatch therebetween. The complaint interface is comprised of a plurality of compliant pads defining channels between adjacent pads. The pads are typically compressed between a flexible film chip carrier and the chip. A compliant filler is further disposed within the channels to form a uniform encapsulation layer having a controlled thickness.
摘要:
A semiconductor chip packaging assembly comprising a frame having a central aperture, a flexible substrate attached to the frame across the central aperture, and a unitary support structure having a plurality of apertures therethrough attached to the substrate within the central aperture of the frame with at least some of the substrate terminals underlying the unitary support structure. A chip is disposed within each aperture and attached to the substrate with the electrical contacts of the chip connected to the substrate terminals. A compliant layer is disposed between the substrate and the unitary support structure and between the substrate and the chip.
摘要:
A method and an apparatus for providing a planar and compliant interface between a semiconductor chip and its supporting substrate to accommodate for the thermal coefficient of expansion mismatch therebetween. The compliant interface is comprised of a plurality of compliant pads defining channels between adjacent pads. The pads are typically compressed between a flexible film chip carrier and the chip. A compliant filler is further disposed within the channels to form a uniform encapsulation layer having a controlled thickness.
摘要:
A semiconductor chip connection component having numerous leads extending side-by-side across a gap in a support structure, each lead having a frangible section to permit detachment of one end of the lead from the support structure in a bonding process. The frangible sections are formed by treating the lead-forming material in an elongated treatment zone extending across the regions occupied by numerous leads to provide a step defining a fracture point of the lead during a wire bonding process.
摘要:
A method of treating a lead in a chip package. A conductive lead is positioned such that it extends across a gap in a dielectric substrate and is secured at either end to a first surface of the substrate. Directed energy is then applied to a desired portion of the surface of the lead within the gap. As a result of the application of energy, a surface layer of the lead is recrystallized thereby creating a fine grain, dense surface layer of lead material. Surface contaminates may be vaporized and contaminants at the grain boundaries of the recrystallized surface layers may be driven away from the grain boundaries such that a treated lead is more ductile and has better resistance to thermal cycling after the lead has been attached to a chip contact.
摘要:
Microelectronic assemblies such as semiconductor chip assemblies are encapsulated. During encapsulation, the terminals carried by a dielectric layer in each assembly, and the bottom surface of the semiconductor chip in each assembly are protected by covering layers. The covering layers confine the liquid encapsulant and prevent contamination of the terminals and chip bottom surfaces. The encapsulation process may be conducted by using a tilting fixture. The liquid encapsulant and the assemblies are placed into the fixture, the fixture is closed and evacuated, and the encapsulant is then poured onto the assemblies while maintaining the fixture under vacuum. The fixture is then pressurized and maintained under pressure during cure of the encapsulant.