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IRG4PE40SD Datasheet(PDF) 6 Page - International Rectifier |
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IRG4PE40SD Datasheet(HTML) 6 Page - International Rectifier |
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6 / 35 page  Using IGBT Reliability Information Classic Bathtub Curve for failure rate of solid state devices λ ( t ) Infant Failures Wearout Failures Random Failures Log Time Reliability is the probability that a semiconductor device will perform its specified function in a given environment for a specified period of time. Reliability is quality over time & environmental conditions. Reliability can be defined as a probability of failure-free performance of a required function, under a specified environment, for a given period of time. The reliability of semiconductors has been extensively studied and the data generated from these works is widely used in industry to estimate the probabilities of system lifetimes. The reliability of a specific semiconductor device is unique to the technology process used in fabrication and to the external stress applied to the device. In order to understand the reliability of specific product like the IGBT it is useful to determine the failure rate associated with each environmental stress that IGBT's encounter. The values reported in this report are at a 60% upper confidence limit and the equivalent device hours at state of working temperature of 90°C. It has been shown that the failure rate of semiconductors in general. when followed for a long period of time, exhibits what has been called a "Bathtub Curve" when plotted against time for a given set of environmental conditions. t IGBT / CoPack Quarterly Reliability Report Page 6 of 35 |
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