ABB 1SDA073858R1 Cable interlock A - HR

ABB 1SDA073858R1 Cable interlock A - HR

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The failure rate is the probability with which devices in the field will show any failure according to the above criterion. Typically, Infineon uses a failure rate of 5% for determining the PC curves. However, in the case of discrete devices, there are PC curves released showing 1%, 5% and 10% failure probabilities. 

What are the cycle times which should be considered relevant for PC? Specifically for industrial power modules, the tests at Infineon are performed with cycle times of ton + toff = 3 s. Infineon’s investigation cover ton times from 0.1s ... 60s. For this regime, a typical dependency can be given as shown in Figure 3. 

As an approximation, the derating factors reached at the limits of the 0.1 … 60s interval should be used also for tcyc extending the regime. For shorter cycles this would be regarded as a conservative approach; for longer cycles, the approximation is based on the assumption that viscoplastic deformation saturates for t > 60 s. 

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