My recent experience to highlight the value of IPC-2581 in the ECAD library segment:

Here is a Case Study: IPC-2581 and the Missing Resistor
Our team just finished a design handoff where the power of a strong ECAD library, combined with IPC-2581, really paid off.

The Old Way (Gerber/Excellon): We used to ship files and pray the manufacturer cross-referenced the separate BOM PDF correctly. This often led to an initial build missing critical, low-cost passives because of a manual data mismatch during CAM tool-up.

The IPC-2581 Difference:

Our internal library components now enforce 3D models and critical manufacturing attributes (like pick-and-place center points). When we exported the design as a single IPC-2581 file:

* The manufacturer’s DFM tool automatically extracts the Component Attributes and Assembly Data directly from the single file.

* It instantly flagged a misalignment of a new 0201 resistor model against our custom paste mask, catching a …

— Article from E-Cad Bridge —