This presentation covers the challenges associated with IC package inspection and shows how two nondestructive techniques, scanning acoustic microscopy and X-ray imaging, are being used to locate and identify a wide range of defects, particularly those in 3D packages and multilayer boards. It reviews the basic principles of scanning acoustic microscopy (SAM), X-ray imaging, and 3D X-ray tomography and the factors that affect image resolution and depth. It demonstrates the current capabilities of each method along with different approaches for improving resolution, contrast, and measurement time.

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