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Design for Excellence (DFX) Support
DFX is designing for the right balance between manufacturability, testability, inspectability, Supply Chain Flexibility and Product Life Cycle Manageability to obtain the optimum product cost, performance and reliability.
Consideration must be given to both the printed circuit board fabrication and the printed circuit board assembly processes. Understanding the capabilities, limitations and needs of each piece of equipment and the overall process is essential to designing a printed circuit assembly. For example, there are variations in min/max board size capabilities, keep out areas, fiducial marks, CAD file requirements, etc. Layout design rules change depending upon component package selections and the manufacturing process to be used.
A test philosophy must be determined prior to PCB layout and design. 100% nodal coverage is not always possible. Flying probe, functional test and in-circuit test using boundary scan, cluster testing or percentage of nodal coverage each have their own layout requirements and related cost.
Automated Optical Inspection (AOI), Automated X-ray Inspection (OXI), Acoustic Micro Imaging (AMI) and Infrared Verification (IRV) have become commonplace on the manufacturing floor due to the increasing complexity of components and PCB assemblies. Properly formatted CAD and component data reduce programming and manufacturing cost.
An electronic component today may be available in several package types. Many packaging configurations exist for each package type. The selection of one package type over another may have an effect on procurement lead-time, number of sources and cost. Packaging selection and packaging orientation will affect manufacturing setup configurations and cost. Each packaging format per component part adds another part number to the inventory.
The cost of managing a product throughout its life cycle will be determined during the design phase. The thoroughness of the documentation for the PCB, PCB fabrication process, components, component package/packaging, approved vendors and the manufacturing processes will determine the manageability of the product throughout its life cycle.
The right design balance is driven by many realties in the product market segment, manufacturing capabilities and cost. The key is a collaborative process that balances the entire process. AMT's Collaborative D2M Design Support can provide the guidance and assistance needed to obtain the optimum design balance that will increase reliability, reproducibility and reduce cycle time and cost.
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