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PCB Design Rules

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Initially PCBs were designed manually by creating a photomask on a clear mylar sheet, usually at two or four times the true size. Starting from the schematic diagram the component pin pads were laid out on the mylar and then traces were routed to connect the pads. If you have many questions of PCB Design, please come here!

Community > Groups > PCB Design Rules > The way of label components changing between PCB versions
The way of label components changing between PCB versions
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 I have a current version of my PCB, and I'll make a new one where I will delete some resistors here and add some more there.

For numbering, is there any common rules? Should I re-use the numbers of deleted resistors for the new ones, should I re-number everything to avoid holes in the numbering sequences, or should I leave the holes in the sequence for the deleted resistors and add the new ones at the end of the sequence ?
Statement: This post is only the personal view of the author and does not represent the opinions of

Francisco Mesa

I prefer to use numbering of components based on the functional block staring with 100, 200, and do on.


I generally leave the designators the same after a new review if there is even a slight chance that someone might refer to old documentation while looking at the new board. It keeps continuity between the revs so that a technician can still follow the old schematic when troubleshooting the new board and positional references in documentation will still be accurate.

Ren livingston

You should leave the holes, it lets the schematics and the PCB indicate a mismatch if someone has to repair or diagnose such a device one day in the future.

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