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88 SMT Magazine • November 2015 design process. By exporting the DFA rules that are proven by the manufacturer to represent the constraints of the manufacturing process- es, they can then be transmitted to the design organization to run the complete DFA analysis process while the design is still taking shape and the cost of finding and fixing the manufac- turability problems is so much lower than if left until later in the NPI cycle. In summary, Figure 9 illustrates how the portable DFA solution comprises the following multiple aspects that combine to make a work- ing solution: • A library of component models mapped to commercially purchasable part numbers. The library exists outside the internal networks of individual organizations, thus supporting the outsourced design-through-manufacturing flows of today. • Availability of content in the library to describe the components listed in the bills-of- materials of the participating design and manu- facturing organizations. Part-number coverage must run to the tens of millions, with rapid ser- vice to create missing content on demand to support scalable implementation by designers and manufacturers worldwide. • DFA analysis software tools that can be used both in the context of design and manu- facturing environments, with common func- tionality for the derivation of package and lead- form assignations, and a common DFA rules language. STreAmLINING PCb ASSembLy AND TeST NPI WITH SHAreD ComPoNeNT LIbrArIeS arTIcLe figure 8b: application of a minimum heel-distance rule to a pcb assembly model.