DFM is not just a technology, in a sense,it is more like an idea, included in the various aspects of productimplementation.

PCB design, as the most important processof design from logic to physical realization, DFM design is an important aspectthat cannot be avoided. In PCB design, what we call DFM mainly includes deviceselection, PCB physical parameter selection and PCB design details.

Generally speaking, device selection mainlyrefers to the selection of procurement, processing, maintenance and otheraspects of the integrated more favorable devices. For example: try to use SOPdevice, but do not use BGA device; The device with large device pitch isadopted, and the device with fine spacing is not adopted. Try to useconventional devices, not special devices, etc. DFM selection of components, asPCB designer and procurement engineer, hardware engineer, process engineer andother consultation decision.

The physical parameters of PCB design aremainly determined by PCB designers. Mainly include: plate thickness apertureratio, line width spacing, laminated design, pad aperture and other Settings.This requires a PCB designer must have a thorough understanding of PCBmanufacturing process and manufacturing methods, understand most of the platefactory processing parameters, and combining with the actual situation ofveneer for physical parameters setting, try to increase the PCB productionprocess window, using the most sophisticated processing technology andparameter, reduce processing difficulty, improve yield and reduce the cost ofPCB post-production and cycle, namely "do not kill the goose that usewheel" nor "kill cattle use chicken knife".

A lot of the details of PCB design dependon the level and experience of the design engineer. Such as: device placementposition, spacing, wiring processing, copper processing. These parameters needto be accumulated over a long period of time. Generally speaking, professionaldesign is exposed to more requirements of PCB board plants and welding plants,so generally their design parameters can meet the requirements of the vastmajority of board plants, rather than only meet the specific cost requirementsof a factory.

In a narrow sense, DFM is to make the designmore suitable for the requirements of production, and also requires us to fullyconsider the production situation when designing, so that the design can beproduced. In a broad sense: the design is to meet the production requirementsof the majority, can make the design of things in production have more choices,reduce costs. Design for money!