Increases in sophistication, functional performance requirementsĬlass 3 High Reliability Electronic Products. Performance Classification Three general endproductĬlasses have been established to reflect progressive Returning to IPC, at least IPC-7351 defines three distinction criterions which could be combined very arbitrarily depending again on your design goals: Generally speaking, there could be as many footprints as you need depending on the criteria set to be satisfied in each possible (working) case.īelow is an example of a hypothetical SMD resistor's footprints prepared in relation with the target board manufacturing/fabrication process: hypothetically you desire the first if you plan to design a pcb that will be fabricated in a small number with next manual assembling, ect.
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