IPC-2221, the Generic Standard on Printed Board Design, establishes essential, base-level requirements for the reliability, safety, and manufacturability of single-sided, double-sided, and multilayer printed circuit boards. The standard, currently in its 2023 "C" version, provides crucial guidelines for electrical spacing, thermal management, and material selection, and acts as the foundational "umbrella" document for more specific sectional standards. For more information, visit ANSI webstore.ansi.org/standards/ipc/ipc2221c2023.
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IPC-2221 dictates the minimum hole-to-hole spacing specifically to prevent CAF. But here is the conspiracy: The PDF provides three different spacing tables (Class A, B, C, D for different reliability levels). Most engineers use Class B. But aerospace and medical use Class A—which is 200% larger. Ipc-2221 Pcb Design Pdf