Many important semiconductor package defects are completely hidden from optical inspection. A solder ball can contain a void. A bond wire can be broken inside an encapsulated package. A die-attach layer may contain large areas of voiding. A package substrate can contain an open trace, and an advanced package may have
Read MoreScanning Electron Microscopy (SEM) is one of the most important imaging techniques used in semiconductor failure analysis. While optical microscopes remain extremely useful for initial inspection, many semiconductor defects are simply too small to characterize adequately with visible-light microscopy. SEM uses a focused beam of electrons rather than light, allowing engineers
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Many semiconductor failure-analysis techniques require direct access to structures that are hidden inside an IC package. The semiconductor die, bond pads, bond wires and other critical components may be completely covered by epoxy molding compound or other packaging materials. Before these structures can be examined using techniques such as optical microscopy, emission
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Integrated circuits can fail for many different reasons. Some failures originate inside the semiconductor die, while others result from packaging, manufacturing, assembly, electrical overstress or the environment in which the device operates. Common IC failure mechanisms include electrostatic discharge (ESD), electrical overstress (EOS), electromigration, dielectric breakdown, interconnect defects, corrosion, contamination, thermal
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Once an electrical failure has been localized inside an integrated circuit, the next challenge is determining what physically went wrong. Was a metal interconnect broken? Did a via fail? Is there contamination between two structures? Has a dielectric layer broken down? Is a transistor structure abnormal? Or did the failure originate in the
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When an integrated circuit fails, one of the first questions is: How is the device failing electrically?
A chip may exhibit excessive leakage current, a short circuit, an open connection, abnormal supply current, a parametric shift or a complete functional failure. Before engineers physically cut into the device, they usually