In essence, if a company wants to claim they manufacture PCBs to Class 3 (high reliability) or Class 3/A (space and military) standards under an IPC program, they must follow the framework set forth in the .
to measure how well a process stays within specification limits. A common target for capability is Control Plans ipc9191 pdf
While IPC-9191 is the general foundation, companion standards provide industry-specific applications: : SPC for base materials (laminates/prepreg). IPC-9193 : SPC for printed board fabrication. IPC-9194 : SPC for printed board assembly (PBA). In essence, if a company wants to claim
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