Non-destructive laboratory-based X-ray diffraction mapping of warpage in Si die embedded in IC packages
We outline the development of a novel laboratory-based X-ray diffraction methodology. First available lab-based technique for measuring stress/strain inside packaged chip. The technique is demonstrated at 25C and processed at elevated temperatures up to 115C. It has been proven through characterising commercially available packaged chips. Large thermal stresses are developed due mainly to die attach process.
non-destructive x-ray diffraction warpage stress integrated circuit embedded qfn package