Abstract:
A tool having a coining projection is operative for forming a frangible portion in a lead of a microelectronic connection component by application of a compressive force. The coining projection is supported on a pedestal formed from a tool body. In an alternative embodiment, the pedestal is formed on a backing plate for use in circuits up construction. The pedestal is sized and shaped so as to be received within a gap formed in a support layer for the leads. By application of the compressive force, the coining projection will penetrate the lead within the region of the gap to form the frangible portion.
Abstract:
A connector for microelectronic elements includes a sheetlike body having a plurality of active contacts arranged in a regular grid pattern. The active contacts may include several sheetlike metallic projections extending inwardly around a hole in the sheetlike element, on a first major surface of the sheetlike element. A support structure such as a grid array of noncollapsing structural posts is on a second major surface of the sheetlike element, and each of the posts is electrically connected to one of the active contacts. The grid array of posts and the grid array of active contacts are offset from one another so that an active contact is surrounded by several posts. The posts support the sheetlike element spaced away from a substrate to which the posts are attached. A microelectronic element having bump leads thereon may be engaged by contacting the bump leads with the active contacts, and deflecting the sheetlike element between the bump leads on one side and the posts on the other side. The assembly can be tested, and if found acceptable, the bump leads can be permanently bonded to the contacts.
Abstract:
A substantially continuous layer of a first metal such as copper is provided with strips of a second metal such as gold by selective electroplating of the second metal, or by applying separately formed strips such as lengths of wire. A dielectric support layer is provided in contact with the first metal layer, and the first metal layer is etched to leave strips of the first metal contiguous with the strips of the second metal, thereby providing composite leads with the first and second metal strips connected in series. The process provides simple and economical methods of making microelectronic connection components with leads having a flexible, fatigue resistant lead portion formed from a precious metal. The leads may incorporate sections of round cross-sectional shape to facilitate engagement by a bonding tool during use of the component.
Abstract:
A connector for microelectronic elements includes a sheet-like body having a plurality of holes, desirably arranged in a regular grid pattern. Each hole is provided with a resilient laminar contact such as a ring of a sheet metal having a plurality of projections extending inwardly over the hole of a first major surface of the body. Terminals on a second surface of the connector body are electrically connected to the contacts. The connector can be attached to a substrate such a multi-layer circuit panel so that the terminals on the connector are electrically connected to the leads within the substrate. Microelectronic elements having bump leads thereon may be engaged with the connector and hence connected to the substrate, by advancing the bump leads into the holes of the connector to engage the bump leads with the contacts. The assembly can be tested, and if found acceptable, the bump leads can be permanently bonded to the contacts.
Abstract:
A method of making a semiconductor chip package is provided in which a compliant layer is provided over a contact bearing face of a semiconductor chip. The compliant layer can have a bottom surface adjacent to the chip face, a top surface facing away from the bottom surface, and at least one sloping surface between the top and bottom surfaces. The compliant layer can be disposed remote in a lateral direction along the contact bearing face from at least one contact adjacent to the sloping surface. Bond ribbons can be formed atop the compliant layer, wherein each bond ribbon electrically connects one of the contacts to an associated conductive terminal at the top surface of the compliant layer. The compliant layer can provide stress relief to the bond ribbons, such as during handling and affixing the assembly to an external substrate. A bond ribbon can include a strip extending along the sloping surface of the compliant layer, the strip having a substantially constant thickness in a direction extending away from the sloping surface.
Abstract:
A microelectronic unit can include a support structure including a dielectric having oppositely-directed first and second surfaces. A plurality of substantially rigid posts can protrude parallel to one another in a direction beyond the first surface of the support structure. Each post may have a top surface remote from the support structure, and the top surfaces can be substantially coplanar with one another. A microelectronic device having a surface with bond pads can overlie the second surface of the support structure with the bond pad-bearing surface of the microelectronic device facing toward the support structure. Connections can electrically connect the posts with the bond pads.
Abstract:
A microelectronic assembly is provided which can include an element including a first dielectric layer and a second dielectric layer overlying the first dielectric layer, the second dielectric layer having an exposed surface defining an exposed major surface of the element. A plurality of substantially rigid metal posts can project beyond the exposed surface, the metal posts having ends remote from the exposed surface. The microelectronic assembly can include a microelectronic device which has bond pads and overlies the element. The microelectronic device can have a major surface which confronts the posts. Connections electrically connect the ends of the metal posts with the bond pads of the microelectronic device.
Abstract:
An electrical resistor is made by providing a sacrificial layer and conductive pads disposed on a first surface of the sacrificial layer. An electrically resistive material is deposited over the pads and on the first surface of the sacrificial layer to form at least one unit including the resistive material and the pads. At least part of the sacrificial layer is then removed so as to expose one or more of the pads.
Abstract:
Disclosed are IC package structures having stair stepped layers and which have no plated vias. Such structures can be fabricated either as discrete packages or as strips such as might be beneficial in for use with memory devices wherein critical or high speed signals can be routed along the length of the multi-chip strip package without having to have the signals ascend and descend from the interconnection substrate on which the assembly is mounted to the IC package termination and back as the signal transmits between devices.