A Second-Level SAC Solder-Joint Fatigue-Life Prediction Methodology

Abstract

An acceleration model is developed for relating existing second-level fatigue-life data of tin-silver-copper solder joints to untested environments. The acceleration model retains the familiar canonical form of the Norris-Landzberg equation. Model parameters are obtained through calibration with an extensive set of published empirical data. The model will find use in making rapid assessments of a product's potential solder-joint field life based on accelerated product tests.