DFM is not just a technology, in a sense, it is more like an idea, included in the various aspects of product implementation.
PCB design, as the most important process of design from logic to physical realization, DFM design is an important aspect that cannot be avoided. In PCB design, what we call DFM mainly includes device selection, PCB physical parameter selection and PCB design details.
Generally speaking, device selection mainly refers to the selection of procurement, processing, maintenance and other aspects of the integrated more favorable devices. For example: try to use SOP device, but do not use BGA device; The device with large device pitch is adopted, and the device with fine spacing is not adopted. Try to use conventional devices, not special devices, etc. DFM selection of components, as PCB designer and procurement engineer, hardware engineer, process engineer and other consultation decision.
The physical parameters of PCB design are mainly determined by PCB designers. Mainly include: plate thickness aperture ratio, line width spacing, laminated design, pad aperture and other Settings. This requires a PCB designer must have a thorough understanding of PCB manufacturing process and manufacturing methods, understand most of the plate factory processing parameters, and combining with the actual situation of veneer for physical parameters setting, try to increase the PCB production process window, using the most sophisticated processing technology and parameter, reduce processing difficulty, improve yield and reduce the cost of PCB post-production and cycle, namely "do not kill the goose that use wheel" nor "kill cattle use chicken knife".
A lot of the details of PCB design depend on the level and experience of the design engineer. Such as: device placement position, spacing, wiring processing, copper processing. These parameters need to be accumulated over a long period of time. Generally speaking, professional design is exposed to more requirements of PCB board plants and welding plants, so generally their design parameters can meet the requirements of the vast majority of board plants, rather than only meet the specific cost requirements of a factory.
In a narrow sense, DFM is to make the design more suitable for the requirements of production, and also requires us to fully consider the production situation when designing, so that the design can be produced. In a broad sense: the design is to meet the production requirements of the majority, can make the design of things in production have more choices, reduce costs. Design for money!
