Silicon Die Packaging Separation under Legacy Line Retrenchment
Legacy line retrenchment forces silicon die packaging changes that alter kerf tolerances, land patterns, register offsets, and landed unit economics.
Thermal Cycling JESD22
Reliability Standard
Standardized test procedure used to evaluate the ability of solid state devices to withstand alternate exposure to high and low temperature extremes. Following thermal cycling jesd22 helps identify mechanical failure modes caused by mismatched expansion coefficients between internal components. The procedure specifies the minimum dwell times and the maximum transition rates between temperatures.
Failure Mechanism
Repeated mechanical stress leads to the fatigue of solder joints and the delamination of plastic packages. Utilizing the thermal cycling jesd22 protocol ensures that parts are subjected to enough stress to uncover latent defects without introducing unrealistic damage. Monitoring for electrical failures typically occurs after a set number of cycles.
Air to air transfer is the most common method for achieving the required temperature ramps.
Test Condition
Different severity levels are defined by the temperature range and the number of repetitions required for qualification. Success under thermal cycling jesd22 demonstrates that the device construction is robust enough for automotive or industrial applications.
Qualification Path
Manufacturers use these results to validate new materials or assembly processes before high volume production begins. Results from thermal cycling jesd22 are often compared to acceleration models to predict field reliability. Data logs must show the actual temperature profile of the parts during the entire test duration.