An electronic assembly for an image sensor device is disclosed. The electronic assembly comprises a package module and a lens set mounted thereon. The package module comprises a device substrate comprising at least one grounding plug therein, in which the grounding plug is insulated from the device substrate and an array of optoelectronic devices therein. A transparent substrate comprises a dam portion attached to the device substrate to form a cavity between the device and transparent substrates. A micro-lens array is disposed within the cavity. A conductive layer is electrically connected to the grounding plug and covers the sidewalls of the lens set and the package module and the upper surface of the lens set. A method for fabricating the electronic assembly is also disclosed.