Abstract: A process and apparatus for picking up and moving a microelectronic package during card assembly operations. A temporary lid having a top surface and a bottom surface attaches to at least one microchip on a substrate via a double-sided adhesive. The top surface of the lid provides a clean, smooth, flat surface to which a vacuum probe may be attached. After completion of the steps where vacuum probe movement is required, the lid and adhesive may be removed from the at least one microchip by pulling them both off together. No residue is left on the microchips.

Abstract: A temporary attach article of a first component to a second component which includes a first component having a first volume of a fusible material; a second component having a second volume of fusible material; and the first and second components being joined together through the first and second volumes of fusible material, wherein the first volume of fusible material has a melting point higher than a melting point of the second volume of fusible material so that the first and second components may be joined together without melting of the first volume of fusible material and wherein the second volume of fusible material is 5 to 20% of the first volume of fusible material. Also disclosed is a method for temporary attach of devices to an electronic substrate.

Abstract: The present invention relates generally to a new method for improving the reliability of cooling designs using thermal paste to cool chips in semiconductor modules and structure thereof. More particularly, the invention encompasses a structure and a method that uses surface chemistry modification of the inside of the thermal cooling caps where it contacts thermal paste. The internal surface of the cap is modified by embedding particles that have the same chemical composition as one or more of the solids used in the thermal paste. The particles may be embedded in the cap by casting, grit blasting, or pressing the particles permanently into the surface.

Abstract: The present invention relates generally to a new method for improving the reliability of cooling designs using thermal paste to cool chips in semiconductor modules and structure thereof. More particularly, the invention encompasses a structure and a method that uses surface chemistry modification of the inside of the thermal cooling caps where it contacts thermal paste. The internal surface of the cap is modified by embedding particles that have the same chemical composition as one or more of the solids used in the thermal paste. The particles may be embedded in the cap by casting, grit blasting, or pressing the particles permanently into the surface.

Abstract: A process and apparatus for picking up and moving a microelectronic package during card assembly operations. A temporary lid having a top surface and a bottom surface attaches to at least one microchip on a substrate via a double-sided adhesive. The top surface of the lid provides a clean, smooth, flat surface to which a vacuum probe may be attached. After completion of the steps where vacuum probe movement is required, the lid and adhesive may be removed from the at least one microchip by pulling them both off together. No residue is left on the microchips.

Abstract: A method and apparatus is provided for forming an elongated solder joint between two soldered substrates of an electronic module by applying a controlled separating force between the two soldered substrates during and/or after heating of the module. The solder joints are plasticized, preferably to the molten state above the liquidus temperature, and are thereby stretched and the module is then cooled to solidify the stretched joints. An apparatus and method are provided which preferably uses a vacuum device as the separating force to stretch the existing solder joints to the desired solder height and configuration which is preferably an hour-glass shape.

Abstract: A method and apparatus are provided for forming an elongated solder joint between two soldered substrates of an electronic module or an electronic module in the process of being fabricated by using expandable solder bump means disposed between the substrates. The expandable solder bumps means comprise solder having a higher reflow temperature than the solder used to join the substrates and expansion means such as a compressed spring encased within the solder and are activated (expanded) by reflowing at a higher temperature than the melting point temperature of the solder joints.

Abstract: A device is provided for stretching solder interconnection joints between two substrates of an electronic module. The device employs an expandable metal to exert a separating (stretching) force to the two substrates whereby a lifting rod attached to a clamping bridge is cause to move upwards by expansion of the expandable metal raising a first substrate clamped thereto. A lifting bridge in connection with the clamping bridge is caused to move downward to maintain the lifting bridge in contact with the second substrate being interconnected to the first substrate.

Abstract: The present invention relates generally to a new apparatus and method for encapsulating ceramic chip carriers. More particularly, the invention encompasses an apparatus and a method for providing a fluid-tight, non-hermetic seal to a ceramic chip carrier utilizing dual surfaces. This is done by using the corner edges of the chip carrier, i.e., by using not only a minimal amount of the top-surface real estate of the chip carrier, but also the side-walls of the chip carrier to create the dual surface seal. This dual surface seal can be both hermetic and non-hermetic.

Abstract: A C4 or flip chip reworkable electronic device is provided comprising an integrated circuit chip having conductive pads thereon which pads are electrically connected to corresponding pads on an interconnection substrate by solder connections, wherein the space between the chip and substrate is sealed using a specially defined thermoplastic resin such as polysulfone and polyetherimide.

Abstract: The present invention relates generally to a new scheme of providing a seal band for semi-conductor substrates and chip carriers. More particularly, the invention encompasses a structure and a method that uses a multi-layer metallic seal to provide protection to chips on a chip carrier. This multi-layer metal seal provides both enhanced hermeticity lifetime and environmental protection. For the preferred embodiment the multi-layer metallic seal band is a three layer, solder sandwich structure which is used to create a low cost, high reliability, hermetic seal for the module. This solder sandwich has a high melting temperature thick solder inner core, and lower melting point thin interconnecting solder layers, where the thin interconnecting solder layers may have similar or different melting points.

Abstract: The present invention relates generally to a new scheme of providing a seal band for semi-conductor substrates and chip carriers. More particularly, the invention encompasses a structure and a method that uses a multi-layer metallic seal to provide protection to chips on a chip carrier. This multi-layer metal seal provides both enhanced hermeticity lifetime and environmental protection. For the preferred embodiment the multi-layer metallic seal band is a three layer, solder sandwich structure which is used to create a low cost, high reliability, hermetic seal for the module. This solder sandwich has a high melting temperature thick solder inner core, and lower melting point thin interconnecting solder layers, where the thin interconnecting solder layers may have similar or different melting points.

Abstract: The present invention relates generally to a new adhesive comprising a vinyl containing siloxane-containing polyimide for use in TSM capping of electronic package assemblies with adhesive capability of providing a seal band width of less than 4mm and even less than 2mm, solubility in non-toxic and environmentally safe solvents and durable adhesive properties and to a method for making the polyimides, a method for using the polyimides to make electronic packages and electronic packages made using the adhesive. The preferred vinyl-containing siloxane containing polyimide is a block type polymer containing blocks of a dianhydride-aromatic diamine oligomeric reaction product joined by non-vinyl/vinyl containing siloxane diamine forming links.

Abstract: A C4 or flip chip reworkable electronic device is provided comprising integrated circuit chip having conductive pads thereon which pads are electrically connected to corresponding pads on an interconnection substrate by solder connections, wherein the space between the chip and substrate is sealed using a specially defined thermoplastic resin such as polysulfone and polyetherimide.

Abstract: A cleavable epoxy resin composition suitable for encapsulating electronic chips comprising the cured reaction product of a diepoxide containing a cyclic anhydride curing agent and an amine promoter.

Abstract: The present invention relates generally to a new apparatus and method for directly joining a chip to a heat sink. More particularly, the invention encompasses an apparatus and a method that uses a double-sided, pressure-sensitive, thermally-conductive adhesive tape to directly join a chip or similar such device to a heat sink.

Abstract: A cleavable epoxy resin composition suitable for encapsulating electronic chips comprising the cured reaction product of a diepoxide containing a cyclic anhydride curing agent and an amine promoter.

Abstract: The present invention relates generally to a new apparatus and method for a chip carrier. More particularly, the invention encompasses an apparatus and a method that uses a chip carrier having a single encapsulant to provide both flip chip fatigue life enhancement and environmental protection. A double-sided, pressure-sensitive, thermally-conductive adhesive tape could also be used with the encapsulated chip to directly attach the chip to a heat sink. Similarly, also disclosed is a method and apparatus for directly joining a heat sink to the chip carrier.