³Ô¹Ïtv / ENGINEERING EXPLANATIONFree thermal-mismatch indicatorPackageMovement = |CTE A - CTE B| xdelta T x DUse ppm/K, K and mm; divide by1000 for umNo stress or fatigue modelThe result does not select anunderfillIllustrative geometry only. Not to scale, a production setting or evidence of qualification.