Ipc 7351.pdf [extra Quality]

IPC-7351 (formerly IPC-SM-782) is the definitive industry standard for establishing land pattern (solder pad) geometries for surface mount components. It provides a methodology to accommodate different manufacturing densities and process capabilities. The standard reduces tombstoning, poor wetting, and solder bridging by optimizing toe, heel, and side fillets.

When you download an calculator or reference chart, you will always see three columns for pad dimensions. Choosing the right density is the first step to design success. IPC 7351.pdf

The standard calculates three main pad dimensions: and solder bridging by optimizing toe

If you cannot use a wizard, download an IPC-7351 spreadsheet calculator (many are open-source). Input the component’s max and min dimensions from its datasheet. The spreadsheet will calculate the three pad sizes. IPC 7351.pdf