International Business Machines Corporation

Sigvart J Samuelsen

William C Ward

Douglas W Phelps, Jr

Douglas L Lumbra

Robert J Marks

Marvin L Buller

Richard P Pashby

The present invention is directed to a packaged semiconductor chip which effectively dissipates heat and has improved performance. The packaged chip has a plurality of lead frame conductors extending through the encapsulating material which are adhesively joined to the semiconductor chip, preferably by means of an alpha barrier. The conductors cover a substantial portion of the surface of the chip and thereby serve as conduits for the dissipation of heat from the chip. Wires are bonded to the conductors and extend from the conductors to the terminals on the semiconductor chip. In a preferred embodiment the semiconductor chip terminals are located along a center line of the chip. This allows for short connecting wires which in turn contribute to faster chip response.

Package semiconductor chip

An improved thermal management technique is disclosed for use in semiconductor device packaging utilizing ultrasonic welding to attach aluminum wires of predetermined diameter at one end directly to preselected hot spots on the device and at the other end to thermally conductive package elements.

Welded wire cooling

A method of forming semiconductor devices wherein a continuous metallic sheet is cut under computer control into a personalized lead pattern. The pattern is then moved to a bonding station. A bonding tool actuated by computer control moves from one terminal end to another to sequentially bond terminals to the semiconductor device. A variety of various patterns and chips can be handled on the same line using common cutting and bonding tools. A second bond can be made from the lead pattern to either a lead frame or a substrate.

Highly integrated universal tape bonding

A method and apparatus for improved percussive arc welding is disclosed. In this technique a test arc of a voltage no greater than the initiating voltage of the percussive arc welding is first applied across the pieces to be welded. The welding cycle is then performed if, and only if, an arc is detected responsive to the impressing of the test voltage.

Growing community of inventors

Burlington, VT, United States of America

Sigvart J Samuelsen