Thermal-mechanical coupling analysis for coupled power and thermal cycling reliability of chip-scale packages

The sequential thermal-mechanical coupling analysis, which solves in turn the transient temperature field and subsequent thermo-mechanical deformations, is carried out in this paper to investigate thermal characteristics along with fatigue reliability of board-level thin-profile fine-pitch ball grid array chip-scale packages under coupled power and thermal cycling test conditions. Pure thermal cycling and pure power cycling test conditions are also examined and compared.