1st time posting question here.
I'd like feedback on best practice for labelling PCBs with the board (bare PCB) Part Number (PN) and/or assembled (PCBA) part number. We give bare PCBs a PN, then the assembled PCBA gets different PN, however within the company there's a lot of division over what should be printed on the silkscreen. Bare PCB number only, PCB + PCBA numbers or PCBA only. PCBA makes it easier for production staff to identify but makes design changes difficult since even a component replacement requires silkscreen update, not to mention I want to introduce variants, so we have same PCB used in multiple PCBAs. This is complicated by us being medical device designers/manufacturers so there is lot of concern around traceability. In summary what's best practice;
- only bare PCB part number on silkscreen (or copper)
- bare PCB part number & assembled PCB part number printed on board
- only assembled PCBA part number printed on board
- bare PCB part num printed on board, label PCB assembly part number with adhesive label
Note we do include versions but I've left out of discussion to keep it simple