Printed Circuit Card Design
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
In current printed circuit card technology, the card includes a plurality of power planes and signal planes. Plated through holes (PTHs) are provided which extend from front to back and which receive pins or leads from components, such as circuit modules. Additional plated through holes are provided which extend from front to back and which serve as vias for wire routing, engineering changes (ECs) and as holes for internal test probing (ITP). A large number of holes are empty and unused in the total standard matrix. As a result, valuable card real estate is taken up which limits the signal plane wiring capability and capacity.