Meaning
Degradation of a component or material when exposed to extreme heat in a non-operating state over a prolonged duration. A high temperature storage failure typically reveals weaknesses in the chemical stability or mechanical bonding of an assembly. Engineers use these tests to predict the shelf life and long-term reliability of products in hot environments.
Degradation Process
Sustained thermal energy accelerates chemical reactions and atomic diffusion within the device. In a high temperature storage failure, the integrity of adhesive bonds or the crystalline structure of semiconductor layers may deteriorate without any electrical current being present. Environmental stress tests the fundamental durability of the material stack.
Standard Requirement
Reliability laboratories follow specific protocols such as JEDEC standards to define the duration and temperature levels. A high temperature storage failure during a thousand-hour test at 150 degrees Celsius indicates that the product cannot withstand the intended storage conditions. Passing these rigorous benchmarks is often a prerequisite for automotive or industrial supply contracts.
Root Cause
Post-test analysis often points to intermetallic growth or moisture ingress as the primary trigger. When a high temperature storage failure occurs, the manufacturer must evaluate the compatibility of the selected plastics and metals. Redesigning the package or changing the encapsulation material are common responses to these findings.
