Cost and easy inspection favor fine-line boards vs multilayer; NEC gets five lines per 0.1 in. in supercomputer card.

EDN, September, 1989 by Magnus, Stephen A.

Cost and easy inspection favor fine-line boards vs multilayer In the design of high-density circuit boards, the mature multilayer approach is facing a growing challenge from fine-line technology. Lower production costs and ease of design favor fine line, proponents argue, and now one company has demonstrated the ability to render a density of five lines within 0.1 in., rendering the technology even more competitive.

The NEC Corp, based in Tokyo, Japan, chose a fine-line approach instead of a multilayer one for a number of board designs, including a board developed for a supercomputer manufacturer. That board uses five lines per 0.1 in. Fine-line technology is usually regarded as packing a minimum of three lines per 0.1 in. NEC conducted an indepth...

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