Polymeric underfill modulus collapse near glass transition increases board strain attenuation while driving out-of-plane bump fatigue and sensor drift.
WLCSP packaging induces mechanical stress gradients that shift bandgap references, requiring rotated common-centroid layouts and active digital trim.
Board flexure stress couples to analog dies via solder joints and mold compounds, shifting bandgap voltages up to 10 millivolts under thermal cycling.
WLCSP packages transfer board thermal strain directly to the die, causing reference drift, while ceramic cavity housings eliminate mechanical coupling.
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