IPC-7351B Sets a Universal Zero Orientation for Electronic Components

IPC-7351B Electronic Component Zero Orientation [pdf]

This application note from Mentor Graphics defines a consistent zero orientation for electronic components in CAD libraries, aligning with IPC-7351 and IEC 61188-5-1 standards. It specifies pin 1 locations for various component families—chips, molded parts, MELF, SOT, QFP, BGA, and more—to enable global automation and a 'One World CAD Library'. The goal is to eliminate proprietary standards and reduce industry waste.