International Business Machines Corporation

Jac Anders Burke

David Charles Olson

James Edward Tersigni

Jeffrey Scott Wolfe

William F Beausoleil

Lannie R Bolde

Chon Cheong Lei

Tak-kwong Ng

Lawrence A Thomas

N James Tomassetti

Michael Juergen Kessler

Howard D Hutchinson

Juan C Jeri

Kevin C Gallagher

A method and apparatus for separating a semiconductor device from a substrate in a fixture with a shearing element, wherein the semiconductor device is attached to the substrate by solder connections to form an assembly, includes using the shearing element to apply a loading force to the semiconductor device. The assembly of the substrate and the semiconductor device are loaded into the fixture with the shearing element proximate the semiconductor device, and heating the solder connections of the assembly in the fixture are heated proximate the substrate to a predetermined temperature by applying a heat source to a surface of the substrate distal from the semiconductor device.

Die removal method and apparatus

Chips requiring high temperature reflow for attachment to a module substrate are attached first and then a eutectic water soluble solder paste and/or water soluble flux is dispensed on both the TSOP and the PBGA chip pads instead of using the paste screening techniques. The dispensing is done by injecting solder on the solder sites individually. Characteristics of the solder paste used is that it must be fluid enough to be injected onto the individual sites yet have enough body that it remains in place and does not run from site to site once dispensed. A paste capable of providing such characteristics is one having: a ) a very fine particle size in the range of 400 to 500 mesh and preferably between 400 and 450 mesh; b) a low viscosity (below 500 k centerpoise and preferably between 425 to 375 cps); and c) a solid content of 86% or lower and preferably between 84 and 80%. The chips to be joined to the module using low temperature module joining are then placed on the module substrate surface and then put in an oven for reflow to attach these chips to the surface. After the joining process, the modules are cleaned by spraying deionized water on them to remove any flux or solder residues and the modules are electrically tested to determine if the joining process has resulted in connection with the proper mechanical and electrical characteristics.

Assembly of multi-chip modules using eutectic solders

A shaving or shearing blade utilized in dressing solder joint chip technologies without the use of heat or a copper block wicking process. In essence, any solder debris resulting from the solder shaving process as implemented by the shaving blade is removed through the intermediary of a vacuum arrangement located as an integral structure in the shaving blade so as to inhibit the potential formation of electrical shorts or causing solder damage in subsequent replacement chip joins or other assembly operations.

Shaving blade for chip site dressing

Growing community of inventors

Lake Katrine, NY, United States of America

Jac Anders Burke