Burroughs, Inc.

Robert V Hutchison

John A Nelson

James J MacBride

Peter P Gregg

Gerald R Dunn

A process of packaging an electronic integrated circuit which comprises a film carrier having metallized connector leads formed thereon to provide the connector leads for the integrated circuit (a hermetically sealed bumped die); gang-bonding the die to said leads; preferably testing the die and bounding thereof for electrical performance, continuity, etc.; placing a metal heat sink having a raised die attach area and a pair of pedestals coextensive with said film carrier into a transfer mold with the leads remaining planar; epoxy bonding said die to said die attach area concurrently soldering selected leads to said pedestals; and completely encapsulating said die in plastic while in said mold allowing said plastic to flow freely on both sides of the die attach area and over most of said heat sink to prevent warpage of the package when said plastic and metal cools but leaving the outer edges of said leads, not connected to said pedestals, open and free of plastic. In one embodiment, a leadless type package is formed by the process with the heat sink having means for liquid or change of state cooling, and in another embodiment an air cooled leadless type package is formed by the process.

Process of forming a plastic encapsulated molded film carrier CML

A cooling system for integrated circuit packaging of the conventional dual-in-line (DIP) type including a carrier heat sink plate which form web sections which engage the bodies of the DIP held side-by-side thereon. The plate is thermally and mechanically connected by means of a clamping device to a cooling frame in which a serpentine tubing carries coolant throughout spaced apart sections thereof, so that the heat generated by the DIP's is carried away by the heat sink plate into the frame sections where the coolant circulate. The DIP pins are electrically connected to a printed circuit board and to relatively flat flexible ribbon type printed circuit type cable the latter being clamped at each end into a standard connector which itself is clamped to an island printed circuit board having conductors thereon for connecting the DIP's to other electronic devices. Multiplicity of these DIP's so mounted in the cooling frame may be housed in the same console or housing along with other DIP islands as desired.

Cooling system for dual-in-line packages

A system for cooling high density integrated circuits for computer systems comprising a cooling frame having a plurality of the heat pipes spanning the space within the frame to which sub-islands are attached to form an island. Each sub-island comprises a printed circuit board on which are mounted connectors for mounting the integrated circuit package and printed circuit board heat sinks having posts which cooperate with hold down pressure clamps for clamping the integrated circuit packages into the connectors and to clamp the heat sink plates of the integrated circuit packages to the printed circuit board heat sinks. These posts also aid in clamping the sub-islands together by cooperating a heat pipe hold down clamp by which each sub-island is clamped to the frame and to the heat pipes both mechanically and thermally to maximize the heat transfer between the integrated circuit packages and the heat pipes. The condenser end of the heat pipes extends into a plenum chamber through which air is circulated so that the heat generated by the integrated circuit packages ultimately dissipated in the ambient air. Utilization of heat pipes maintains the integrated circuit packages at a uniformly low temperature and in the preferred embodiment, each sub-island is modular and can be connected or disconnected from the frame as a unit for testing, repairing and/or replacement without disconnecting or dismantling any other sub-island or the island can be operated with less than full complement of sub-islands.

Heat pipe cooling for semiconductor device packaging system

A controlled impedance connector for providing a high density controlled impedance interface between a computer backplane and printed circuit (PC) logic card circuitry having signal carrying conductors and a ground surface imbedded in a dielectric medium at selected spacings to achieve a desired characteristic impedance. A common ground surface is provided for a plurality of signal conductors which are in a selected geometrical relationship with the ground surface. Another embodiment of the invention uses a plurality of microstrips embedded in a dielectric medium and dielectrically separated from a common ground surface to achieve the desired characteristic impedance.

Controlled impedance connector

A semiconductor device package which can be readily mounted on a printed circuit board without requiring soldering or intermediate connectors. A supporting substrate has a unique lead frame configuration thereon in which the leads extend around side portions of the substrate and form integral spring contacts projecting from the lower surface of the substrate. The package preferably includes a metallic stud having a head portion mounted in the substrate for receiving a semiconductor device and a rod portion extending from the lower surface of the substrate. The rod portion of the stud can be removably secured in an aperture in a printed circuit board to engage the spring contacts with corresponding conductors on the circuit board.

Pluggable semiconductor device package

A unique contact pin configuration for an electrical connector provides an advantageous connection with a leadless semiconductor device package and a printed circuit board on which the connector is to be mounted. Each contact pin includes an elongated shaft portion, a resilient contact portion and a crossbar portion which offsets the contact portion from the shaft portion of the contact pin. Each contact pin is alternately situated 180.degree. in cavities disposed on two opposed sides of the connector. Consequently, the contact portions of the contact pins provide internal electrical connection to a leadless semiconductor device package with a small contact pad spacing, while providing an external electrical connection via the contact pin shaft portions with a larger spacing therebetween. Also described herein are distinctive stand-off bumps which are coaxial with the shaft portions of the contact pins to insure level mounting onto a printed circuit board.

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Oceanside, CA, United States of America

Robert V Hutchison