01 The Problem: The Inheritance Trap
Every PCB team eventually inherits an engineering library it cannot reliably audit. Ours held more than 12,000 footprints in the master repository, built by dozens of layout designers across 15 years with virtually no naming taxonomy. While a name like qfn48_7mmx7mm_1row05_vmod is reasonably descriptive, thousands of others resembled U_CHIP_MOD_REV2_FINAL.
Under tapeout pressure, new eCAD Librarians stopped attempting searches and defaulted to redrawing footprints from scratch. Every redundant redraw added another near-duplicate entry into the vault, compounding search latency and introducing insidious fabrication tolerances.
The Geometry Invariance Hypothesis
Names are mutable human metadata; copper pad geometries and solder mask apertures are immutable physical manufacturing invariants. If two footprint definitions exhibit identical pin counts, matching pitch vectors, coincident centroid offsets, and congruent solder clearances, they represent the exact same fabrication reality.
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