Annual Drift Extrapolated from a Four Week Test Bench
Linear annual drift extrapolation from four-week test bench data produces severe forecast errors by ignoring logarithmic relaxation and test fixture noise floors.
Burn In
Reliability Screening
Stress-screening procedures operate components at or above their maximum rated conditions for a fixed duration to identify weak units before they reach the customer. Reliability engineers apply burn in to capture components that would otherwise fail during the earliest stage of their service life. This operation occurs at the end of the manufacturing process but before final calibration or shipping.
Thermal Stress
Applying power at elevated temperatures accelerates the chemical and physical mechanisms that lead to early semiconductor failure. During burn in, the voltage is often increased alongside temperature to maximize the stress on dielectric layers. This environment forces weak wire bonds or contaminated silicon surfaces to break.
Bathtub Curve
Probability distributions for electronic failures typically show a high rate of early defects followed by a long period of stable performance. The primary function of burn in is to move a population of sensors past the infant mortality phase. By removing the outliers that fail in the first few hours, the remaining units exhibit a much higher collective reliability.
Economic Tradeoff
Extended testing consumes electrical power and occupies space on the production floor. If the duration for burn in is too long, the procedure reduces the remaining useful life of the component. Manufacturers balance the cost of these tests against the potential expense of field replacements.