Flow sensors having nanoscale coating for corrosion resistance
First Claim
1. A corrosion resistant sensor, comprising:
- a package having a plurality of package bond pads;
a sensor die mounted in the package, the sensor die including a sensing structure and a plurality of sensor bond pads electrically coupled to said sensing structure;
a plurality of bond wires coupling said plurality of sensor bond pads to corresponding package bond pads; and
a corrosion protection coating blanketed over the sensor die, the plurality of sensor bond pads, the package bond pads, and the bond wires.
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Accused Products
Abstract
A corrosion resistant flow sensor apparatus includes a flow sensor including a micromachinable substrate mounted on a package substrate that includes electrically conductive traces and substrate bond pads. The flow sensor includes a MEMS sensing structure for sensing a mass flow parameter and sensor bond pads coupled to the sensing structure. The sensor bond pads include a top metal layer on a metal diffusion barrier layer including a metal diffusion barrier layer sidewall. Bond wires couple the sensor bond pads to the substrate bond pads. A housing including sides and a top portion is around the flow sensor and includes a flow channel having an inlet and an outlet. A multi-layer corrosion protection coating includes a nm scale adhesion layer and a self assembled monolayer (SAM) is on the adhesion layer. The protection coating covers the sensor bond pads including the metal diffusion barrier layer sidewall.
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Citations
23 Claims
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1. A corrosion resistant sensor, comprising:
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a package having a plurality of package bond pads; a sensor die mounted in the package, the sensor die including a sensing structure and a plurality of sensor bond pads electrically coupled to said sensing structure; a plurality of bond wires coupling said plurality of sensor bond pads to corresponding package bond pads; and a corrosion protection coating blanketed over the sensor die, the plurality of sensor bond pads, the package bond pads, and the bond wires. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A corrosion resistant sensor, comprising:
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a package substrate having a package substrate surface including a plurality of electrically conductive traces and substrate bond pads; at least one sensor comprising a micromachined sensor substrate mounted on said package substrate surface including a sensing structure for sensing a parameter and a plurality of sensor bond pads coupled to said sensing structure for providing a sensing signal, wherein said sensor bond pads include a top metal layer disposed on a metal diffusion barrier layer including a metal diffusion barrier layer sidewall; bond wires coupling said plurality of sensor bond pads to said substrate bond pads; a housing situated around said sensor and said sensor bond wires, the housing including sides and a top portion, and a multi-layer corrosion protection coating including a nanometer-scale adhesion layer, and a self assembled monolayer (SAM) that is hydrophobic or hydrophilic, wherein said multi-layer corrosion protection coating covers the sensor bond pads including over said metal diffusion barrier layer sidewall and covers said bond wires. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of forming a corrosion resistant sensor, comprising:
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mounting a sensor die on a package substrate surface, said sensor die including a sensing structure for sensing a parameter and a plurality of sensor bond pads coupled to said sensing structure; wire bonding said sensor bond pads to package bond pads on said package substrate surface; and performing a blanket deposition of a multi-layer corrosion protection coating over the sensor die, the plurality of sensor bond pads, the package bond pads, and the bond wires. - View Dependent Claims (23)
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Specification