Un-connected pin
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Giovanni62 3 months ago
how do you create a footprint with an unconnected pin?
andyfierman 3 months ago
You can leave create a footprint with more pads than those drawn on the schematic symbol and leave the extra ones unconnected on the PCB. For example an 8 pin DIP packaged single operational amplifier may have only 5 electrically active pins (2 inputs, 1 output and 2 power) and so there only needs to be 5 pins on the schematic symbol. The physical package however has 8 pins so the footprint must also have 8 pads. 5 of the pads will be mapped to the 5 pins on the symbol but 3 pads on it will always be unconnected. For more see: [https://easyeda.com/forum/topic/How-to-avoid-DRC-errors-when-connecting-to-PCB-Footprints-a-k-a-PCB-Libs-90bf944fe3644b21a7d27a9e9d8df8d6](https://easyeda.com/forum/topic/How-to-avoid-DRC-errors-when-connecting-to-PCB-Footprints-a-k-a-PCB-Libs-90bf944fe3644b21a7d27a9e9d8df8d6)<br> <br> and the documents it links to.
andyfierman 3 months ago
If you want to mark a pin as unconnected then attach the green "X" Not Connected symbol to the relevant pin on the symbol in the schematic. This will then exclude that pad in the PCB from generating an DRC errors. Be careful using the Not Connected symbol on pins on Spice symbols unless you understand exactly what you are doing because that will then remove the pin from the spice netlist which may break the simulation. The Not Connected symbol can be used in a simulation but it's usage is too complicated to explain here.
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