First-Generation "Space Cube" Electronic-Circuit Packaging

The term "space cube" denotes a scheme for three-dimensional stacking and interconnection of electronic-circuit modules. [This scheme should not be confused with a related one described in "Stackable Electronic Computer Modules and Interconnections" (NPO-19521), NASA Tech Briefs, Vol. 20., No. 6 (June 1996), page 33.] The figure illustrates a typical first-generation "space cube" stack. Each module in the stack is called a "circuit slice." The circuit slices are squares with edges 3.5 in. (8.89 cm) long, and with 160 electrical contacts on each edge. Electrical connections between corresponding contacts on adjacent modules are made by use of conductive strips on square elastomeric rings that are held in square retainer/spacer frames.