The IPC-A-600 guideline describes the acceptance criteria for printed circuit boards that function as a benchmark used by manufacturers and their customers. This set of rules is intended to ensure that flawless shipped PCBs and the electronic devices or equipment that they are part of function reliably.
The IPC-A-600 describes minimum requirements that trained professionals can observe externally or within the PCB to assess manufacturing quality. Whether the quality is sufficient depends on the electronic device in which the PCB is to be used and the requirements it is to fulfil in operation. The technical complexity and the associated manufacturing costs are therefore dependent on the end- use. That’s where IPC classes come in.