Why is the PCB part number traditionally on a copper layer?

I notice that each design file from the supplier contains part number. It seems that it become a common habit in PCB design field. Just be curious about the reason.

The designer places marks on copper layer for easy identification after the artwork is prepared. Part number on the copper layer will last till the PCB lasts itself.

#PCB Design

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Oliver Smith

Oliver is an experienced electronics engineer skilled in PCB design, analog circuits, embedded systems, and prototyping. His deep knowledge spans schematic capture, firmware coding, simulation, layout, testing, and troubleshooting. Oliver excels at taking projects from concept to mass production using his electrical design talents and mechanical aptitude.
Picture of Oliver Smith

Oliver Smith

Oliver is an experienced electronics engineer skilled in PCB design, analog circuits, embedded systems, and prototyping. His deep knowledge spans schematic capture, firmware coding, simulation, layout, testing, and troubleshooting. Oliver excels at taking projects from concept to mass production using his electrical design talents and mechanical aptitude.

What Others Are Asking

What kind of materials should I used inside USB flash drive?

We are a office stationery brand which is not so sophisticated in USB manufacturing and design, so we outsource them. The quotation is not so pretty in unite price because of the high cost of raw materials, according to the explanation of the supplier. What kind of materials should I used inside USB?

Can I leave a through hole pad off one side of a machine-fabricated PCB?

I’m designing a two-layer PCB and I’m very inexperienced. A third-party company will fabricate them. Now, I have a PTH part with a number of closely spaced pins. However, I can’t greatly simplify routing by running traces unless I eliminate the pads for certain pins on one side of the board. So can I leave a through hole pad off one side of a machine-fabricated PCB?

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