I hereby certify that I am not simply asking someone else to design a footprint for me.
This is an auto-generated message that is in place on the “footprints” section of the KiCad.info forum. If I remove it and ask for a footprint to be designed anyway, I understand that I will be subject to forum members telling me to go design my own footprint or referring me to a 3rd party footprint site.
I don’t know this MCU but why futz around with 3rd party footprints when there appears to be a suitable one in the KiCad library: VQFN-28-1EP_4x4mm_P0.45mm_EP2.4x2.4mm
I have never seen footprints at Microchip, but that might by my fault. So please, where can I find them at the link you have.
Plus, ultralibrarian requires registration.
And they say “Please refer to the latest revision of the manufacturer’s datasheet to confirm product specifications (Symbol, Footprint, and 3D Model). Note that it is the user’s responsibility to verify all specifications before using the provided content.”
“We must accept finite disappointment, but never lose infinite hope” I think you should check it yourself and rise a kicad question if you’re in troubles.
OK I have already tried when I try to route a trace of any thickness from one of the pads of the PIC18F27Q43 I get two green highlighted PAD either side and KiCAD can not route trace.
Hence I am asking some one to quickly prove me wrong an able to route tracning from this footprint.
0.4mm is a quite narrow pitch. It’s easy to route in KiCad, but you have to adjust the design rules in KiCad to set them to smaller track width and clearance as dsa-t already mentioned.
The problem here, is that when features on PCB’s become to small, you have to select a PCB manufacturer which has it’s process tuned to a fine enough accuracy, and that is a more expensive process. So the tradeoff is a slightly smaller PCB for a higher cost.
I see nothing wrong with the footprint. It just is (probably) not compatible with the default design rules in KiCad. KiCad works with nanometer resolution, and that is far more then any PCB can be manufactured.
I understand a wish / need for a small PCB. I see you have found how to change KiCad’s default design rules so this IC can be routed. But that you had to search for it, means you don’t have much with KiCad yet, or maybe even with PCB design. I advise that before you continue with routing, you select a PCB manufacturer and make sure that the design rules you set up in KiCad is actually compatible with what your PCB manufacturer can manufacture reliably.
In general, the advise is to set the rules in KiCad a bit coarser as the minimum that a PCB manufacturer states. Many PCB manufacturers have different processes for PCB’s. 4 layer PCB’s are more expensive then two layers, but this is only partially for the extra copper layers. 4 layer PCB’s often also have a higher resolution. Are you planning for a multi layer PCB?