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Universities with ABET-accredited EE programs often have access to the IPC Educational Portal. Professors can provide the PDF to students for free under academic license.
I = 0.024 × ΔT^0.44 × A^0.725
IPC standards are copyrighted intellectual property. The organization relies on sales of these documents to fund ongoing research and updates. Here is how to access the document: Ipc-2221 Pcb Design Pdf