: Introduced recommendations for local fiducials on fine-pitch components (pitch smaller than 0.635mm for QFPs or 0.8mm for BGAs). Revised Naming Conventions : Expanded the footprint naming convention
Most generic libraries shipped with free software use "IPC-7351 based " math, but they often ignore the Density Levels (A/B/C). Always regenerate footprints using the wizard specific to your tool to ensure compliance. ipc-7351c pdf
The standard defines a systematic naming convention for land patterns. For example: SOIC127P600X175-8N ipc-7351c pdf
Footprints naming convention: IPC-7351 vs. Expert - PCB Libraries ipc-7351c pdf