Encapsulated device of semiconductor material with reduced sensitivity to thermo-mechanical stresses
AssigneeSTMicroelectronics S.r.l.
InventorsAlessandro Tocchio, Carlo Valzasina, Luca Guerinoni, Giorgio Allegato
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Abstract
An encapsulated device of semiconductor material wherein a chip of semiconductor material is fixed to a base element of a packaging body through at least one pillar element having elasticity and deformability greater than the chip, for example a Young's modulus lower than 300 MPa. In one example, four pillar elements are fixed in proximity of the corners of a fixing surface of the chip and operate as uncoupling structure, which prevents transfer of stresses and deformations of the base element to the chip.
Claims12
A device comprising:
- a packaging body having a base element;
- a supporting chip coupled to the base element;
- a MEMS sensor chip of semiconductor material;
- and
- a plurality of pillar elements directly coupling only corners of a back surface of the MEMS sensor chip to the supporting chip such that empty space is provided between a central portion of the back surface of the MEMS sensor chip and a portion of the supporting chip, the plurality of pillar elements being resist and having a first Young's modulus, the semiconductor material of the MEMS sensor chip having a second Young's modulus, the first Young's modulus being less than the second Young's modulus.
A process comprising:
- forming a plurality of pillar elements directly on at least one of a back surface of a MEMS sensor chip of semiconductor material and a base element, the plurality of pillar elements being resist and having a first Young's modulus, the semiconductor material having a second Young's modulus, the first Young's modulus being less than the second Young's modulus;
- and
- fixing the MEMS sensor chip directly to the base element by the plurality of pillar elements, wherein the plurality of pillar elements are located at only corners of the MEMS sensor chip and couples the MEMS sensor chip directly to the base element so that empty space is between a central portion of the back surface of the MEMS sensor chip and the base element.
An electronic device comprising:
- a semiconductor package comprising:
- a packaging body having a base element;
- a MEMS sensor chip of semiconductor material, the MEMS sensor chip having a back surface facing the base element;
- and
- a plurality of pillar elements directly coupling only corners of the back surface of the MEMS sensor chip to the base element, wherein the plurality of pillar elements are spaced apart from each other such that a central portion of the back surface of the MEMS sensor chip remains exposed and perimeter portions of the back surface of the MEMS sensor chip between the plurality of pillar elements remain exposed, the plurality of pillar elements being resist and having a first Young's modulus, the semiconductor material of the MEMS sensor chip having a second Young's modulus, the first Young's modulus being less than the second Young's modulus;
- and
- a processing unit configured to receive signals from the semiconductor package.
Dependencies are inferred from the claim text.