Patent ID: 8624384

Claim:
A solder reflow surface mount microelectromechanical system (MEMS) microphone device comprising: a substrate comprising multiple layers of non-conductive material, each layer having a predetermined coefficient of thermal expansion, and the substrate having a planar upper surface and a planar lower surface, the upper surface having an interior region and a peripheral region that completely surrounds the interior region, the substrate further comprising: a first plurality of metal pads formed on the upper surface of the substrate; a second plurality of metal pads formed on the lower surface of the substrate and arranged within a perimeter of the lower surface of the substrate, wherein the second plurality of metal pads are configured to mechanically attach and electrically couple the surface mount MEMS microphone device to pads on a surface of an external printed circuit board; one or more electrical traces formed completely within the substrate, wherein the traces electrically couple one or more of the first plurality of metal pads on the upper surface of the substrate to one or more of the second plurality of metal pads on the lower surface of the substrate; and a port formed in the interior region of the substrate and passing completely through the substrate, wherein one of the second plurality of formed metal pads is an annular ring that completely surrounds the port in the substrate; a MEMS microphone die mounted to the upper surface of the substrate and electrically coupled to at least one of the first plurality of metal pads on the upper surface of the substrate, the MEMS microphone die having an acoustic passage that is disposed directly over and acoustically coupled to the port in the substrate; and a single-piece cover having a predetermined shape that comprises a top region and a substantially vertical sidewall region that adjoins the central region at a substantially perpendicular angle and that completely surrounds and supports the top region, the sidewall region having a predetermined height, an exterior sidewall surface, an interior sidewall surface, and a bottom surface, wherein the bottom surface of the sidewall region is aligned with and attached to the peripheral region of the upper surface of the substrate, and wherein the predetermined shape of the cover and the predetermined height of the sidewall region, in cooperation with the interior region of the upper surface of the substrate, forms a protective enclosure for the MEMS microphone die and defines an acoustic chamber for the MEMS microphone die.