Patent ID: 11898943
Assignee: STMICROELECTRONICS S.R.L.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A stress sensor, comprising:
a substrate having a first surface;
a recess in the first surface of the substrate, having a second surface, a first portion, and a second portion, the first portion being in a bottom wall of the second portion, and the first portion being deeper and narrower than the second portion; and
a sensor chip of semiconductor material in the recess and coupled to the second surface of the recess, the sensor chip having a thickness smaller by at least one order of magnitude than a thickness of the substrate, the substrate and sensor chip having respective Young's moduli of a same order of magnitude, and a distance between vertical surfaces of the sensor chip and of the second portion is of a same order of magnitude as a main dimension of the sensor chip; and
a hard die-attach layer coupling the sensor chip to the substrate, the first portion of the recess having a depth greater than a thickness of a stack formed by the sensor chip and the hard die-attach layer.