Why are the Kicad Library conventions non-IPC compliant?

[Mars_Warrior]

@Sujith

Can I get a link to the full document from which you have taken these screen shots.

Ofcourse. Just accept the EULA and download the 22MB pdf: PCBL - End User License Agreement

@Sujith

I didn’t understood these M, N, L exactly.

is this like N is for default use and M is for hand soldering application?

Some indeed use the Most version for handsoldering: the “toe” is in general much larger.

@cioma

That’s how PCB Library Expert does it: it stores component package data, not the footprint data.

Indeed. You just enter the dimensions, and required (or IPC recommended) heel/toe/side values, and the footprint is calculated from these settings.

@davidsrsb

I would have thought the place to put value is on a fabrication layer in the component courtyard. The value is there for the assembler or QA inspector

No, the reference is used by the fabhouse to know which component is placed where. Apart from the value, there are more specifications for a component that are needed than the value, eg. manufacturer, power etc. This is with the refdes listed in the BOM.

My silkscreens just show the refdes. I use a separate layer in Kicad (eco1.user) to show the value of each component. There is just no place for a value on a PCB with lots of SMD components.