To understand the weight of IPC-7352, you have to understand the limitations of its predecessor. IPC-7351 was a landmark document, but it operated on a generalized philosophy. It provided standard land patterns based on nominal component dimensions.
Official copies are available for purchase through authorized standards distributors: IPC-7351 and SMD Pad Shapes - PCB Libraries Forum - Page 2 Ipc-7352 Pdf
Accounting for the accuracy of the PCB manufacturing process. To understand the weight of IPC-7352, you have
Implementing IPC-7352 requires a comprehensive approach that involves: If you set A = 0 , you will get impossibly small pads
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The old standard focused only on component dimensions. IPC-7352 introduces a variable A for placement accuracy. If you set A = 0 , you will get impossibly small pads. Always define your assembly house’s tolerance.
Includes newer package types that didn't exist or weren't standardized during the last revision.