Meaning
Accelerated stress testing is used to determine the long-term reliability of integrated circuits by exposing them to elevated temperatures under operational bias. Performing high temperature operating life testing simulates years of standard field operation within a condensed timeframe of several hundred hours. This method forces latent material defects in the silicon or packaging to appear as early failures.
The system boundary of this test is defined by the maximum junction temperature of the device under test.
Test Execution
Devices are mounted on dedicated burn-in boards and placed inside environmental chambers that maintain a constant high temperature. The high temperature operating life testing protocol requires the continuous application of elevated supply voltages while running active software or test patterns. This combination of thermal and electrical stress accelerates chemical and physical degradation processes.
System houses use the resulting data to calculate the failure rate of the component.
Defect Activation
Specific degradation modes such as electromigration and gate oxide breakdown are accelerated by the high thermal environment. This high temperature operating life testing helps identify design flaws in the silicon layout before the module enters mass production. Ensuring the thermal design of the burn-in system prevents localized thermal runaway is critical for accurate results.
This thermal stability ensures that failures are caused by true wear and not by localized overheating.
Compliance Handover
Evaluation results are compiled into a qualification report for the system integrator. This document verifies that the batch meets the lifetime requirements of the industrial standard. It represents the final step before mass production.
