Impact of Monitoring Voltage on the Lifetime Extrapolation During the Accelerated Degradation Tests

During the accelerated stressing test, not only the stress voltage affects the lifetime extrapolation but also the monitoring voltage will play a considerable role. We have conducted a series of tests in various stress and monitoring voltages to quantify this impact. We have seen ~20 times difference on lifetime at monitoring voltages of 1.0V and 1.5V under a same stressed voltage. This difference should be taken into account to accurately predict the lifetime at normal use conditions from the data obtained in accelerated life test.