How to use the in your specific CAD tool (Altium, KiCad, OrCAD) The exact formula for calculating the new proportional pads
More aggressive courtyard boundaries tailored specifically for high-density smartphone, wearable, and IoT hardware layouts. ipc-7351c pdf
: Moves away from the fixed 3-tier (Minimum, Median, Maximum) system. It introduces pad stacks that scale annular ring sizes proportionally based on the hole diameter rather than using static tiers, allowing for more flexible manufacturing. Rounded Rectangle Pad Shapes How to use the in your specific CAD
It is important to note that the IPC committee eventually decided to transition much of the work from the IPC-7351C draft into a new standard: PCB Libraries ipc-7351c pdf
The PDF covers a vast array of packages, including: