When designing your PCB to be compliant with IPC 7351B standards, you may find that your surface mount components are not compliant with the standardized land geometry. Manufacturers work within these standards to ensure that products meet quality and reliability requirements, as well as reducing the amount of rework or scrap. Different types of components require specific footprints if they are to comply with this standard. The IPC 7350 series of standards (specifically, IPC 7351B) specifies generic physical design parameters of land patterns for surface mount components. It’s all about increasing productivity and ensuring your devices will work as you intended.
These standards give designers assurance that the components they select can be reused across their designs, specifications will be consistent, and that IPC-compliant manufacturers can build their boards using standard processes. Industry standards have been a boon for the electronics industry.
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