Yes, you are correct. IPC-7351C introduced contoured courtyards. IPC-7251 also allows contoured courtyards for through-hole components.
Replace the word “rectangular” above with “polygon”.
Sorry for any confusion that might have caused.
Neither standard elaborates on the electrical aspect of this clearance but my interpretation is that it refers to the clearance between the bodies of two adjacent components that may be conductive, or become conductive with contamination, as well as the clearance between the body of one component and the land pattern of another.
The copper-to-copper clearance requirements are usually selected according to manufacturing limitations but in practice the clearance between tracks and lands (pads) is usually greater in order to ensure the track is covered by solder mask.
For the courtyard offset, we are inspired by IPC nominal/level B.
The problem is that IPC is a closed standard and we librarians don’t have access to it. (I myself heavily use an illegally published version from a russian server. This is where i got the values for the new resistor, capacitor, … footprints.)
What happens is that the new assembler won’t be able to assemble the board. It is not any different for mechanical manufacturing. Not every manufacturing facilities can hold required tolerances. However that doesn’t affect the definition of tolerances. All you need to do is to find a facility that can manufacture to tolerances specified or redesign the product with looser tolerances.
We are updating the resistors in our library to fit the KLC standards.
In section S6.1 - Component Reference Designator (RefDes), the KLC references RN as the correct RefDes for Resistor Networks. However, the KiCad footprint library refers to them as Arrays (Ex. R_Array_SIP6)
Can anyone offer insight or clarification?
Which should I use, R_Network/RN or R_Array/RA
My first KiCad PCB design is nearing completion and I just put ground plane pours top and bottom and the DRC is reporting a number of courtyard errors. First time I have ever seen this error and indeed courtyard.
If I have it correct I could ignore any courtyard error if I believe the board can be fabricated? In my case it will be by hand placement so things like will the tweezers allow me to place components without displacing others for example?
I suspect that part of my errors reported may emanate from a couple of components that I have created. I have not on review drawn some of the border layer detail that I am seeing the main library. I was excited that got to finally create a footprint that allowed me to continue with the design. I may have to go back and edit the footprint once I understand fully what needs to be incorporated in the footprint design.