Abstract:
A method of manufacturing a microelectronic assembly includes providing a first microelectronic element having a first surface and a plurality of terminals exposed at the first surface, providing a second microelectronic element having a top surface and a plurality of contacts exposed at the top surface, forming a plurality of conductive elastomeric posts which connect each of the contacts to one of the terminals, and injecting a compliant material between the first surface of the first microelectronic element and the top surface of the second microelectronic element to form a compliant layer.
Abstract:
A sheet such as a polymeric dielectric has elongated lead regions partially separated from the main region of the sheet by gaps in the sheet, and has conductors extending along the lead regions. The lead regions are connected to contacts on a microelectronic element, and the microelectronic element is moved away from the main region of the sheet, thereby bending the lead regions downwardly to form leads projecting from the main region of the sheet.
Abstract:
A semiconductor chip package having an internal laterally curved lead in order to compensate for the CTE mismatch between a semiconductor chip and a supporting substrate, such as a PWB.
Abstract:
A microelectronic assembly includes a component having one or more conductive pads, with each conductive pad having a plurality of solder-wettable strips extending outwardly away from a center, the solder wettable strips being bounded by non solder-wettable material. The microelectronic assembly also includes a composite conductive element positioned atop at least one of the conductive pads, the composite conductive element including a solid conductive core and a layer of solder material overlying the solid conductive core, the solid conductive core having a higher melting temperature than the layer of solder material.
Abstract:
A method of making a semiconductor chip assembly includes the steps of providing a semiconductor chip with contacts and a dielectric substrate wiring layer with terminals, forming a plurality of conductive elastomeric posts such that each post connects one terminal to one contact, and injecting a compliant material between the semiconductor chip and the dielectric substrate wiring layer to form a compliant layer. Another method of making a semiconductor chip assembly includes the steps providing a semiconductor chip with contacts and a dielectric substrate wiring layer with terminals, dispensing a conductive elastomeric material over each of the contacts or over each of the terminals; juxtaposing the chip and the wiring layer such that conductive elastomeric material connects each of the contact to one of the terminals; injecting a compliant material between the chip and the wiring layer and around the conductive elastomeric material to form a compliant layer, and curing the conductive elastomeric material and the compliant material.
Abstract:
A semiconductor chip assembly with a compliant layer overlying the chip and a flexible dielectric layer overlying the compliant layer. Connecting terminals are provided on the dielectric layer for connection to a larger substrate. The connecting terminals are moveable in vertical directions toward the chip. Bonding terminals, electrically connected to the connecting terminals, are also provided on the top layer. A reinforcing element resists vertical movement of the bonding terminals, and thereby facilitates connection of leads between the bonding terminals and the chip.
Abstract:
Electrically conductive elements such as terminals and leads are held on a support structure by a degradable connecting layer such as a adhesive degradable by heat or radiant energy. After connecting these elements to a microelectronic element such as a chip or wafer, the conductive elements are released from the support structure by degrading the connecting layer. The support structure desirably has a predictable, isotropic coefficient of thermal expansion and such coefficient of thermal expansion may be close to that of silicon to minimize the effect of the temperature changes. The conductive elements may be mounted on a plurality of individual tiles rather than on an unitary sheet covering an entire wafer to minimize dimensional changes when the dielectric is released from the support structure.
Abstract:
A microelectronic assembly includes a microelectronic element having a front face including contacts and a back surface remote therefrom, and a mass of a dielectric material at least partially encapsulating the microelectronic element so that the encapsulated microelectronic element forms a body having exterior surfaces, whereby the back surface of the microelectronic element is exposed at an exterior surface of the body. The microelectronic assembly also includes conductive units secured to the mass of dielectric material, the units including bottom flange portions overlying a surface of the body, top flange portions remote from the bottom flange portions and posts extending from the flange portions into the body, the bottom and top flange portions having larger cross-sectional dimensions than the posts, and conductive elements extending through the mass of dielectric material, the conductive elements electrically interconnecting the contacts with the conductive units.
Abstract:
A method of making a microelectronic component by providing a conductive element, providing a resist at selected locations on said conductive element and electrophoretically depositing an uncured dielectric material on the conductive element, wherein the uncured material will be deposited on the conductive element except at locations covered by the resist. The deposited material is cured to form a dielectric layer and the resist is removed so that the dielectric layer has openings extending to the conductive element at locations the locations which were covered by the resist.
Abstract:
Bonding material balls such as solder balls are applied onto contacts of a semiconductor chip or other microelectronic unit using an escapement mechanism which feeds one solder ball per cycle into each aperture of a stencil. The apparatus reliably places one solder ball on each contact of the microelectronic unit.