Patent ID: 8640538

Claim:
A flow sensor comprising: (a) a chip mounting unit mounting a semiconductor chip formed with a plurality of pads; (b) a plurality of leads disposed on an outside of the chip mounting unit; (c) the semiconductor chip disposed on the chip mounting unit; and (d) a plurality of wires connecting the plurality of leads and the plurality of pads formed on the semiconductor chip, respectively, wherein the semiconductor chip includes: (c1) a flow sensing unit formed on a main surface of a semiconductor substrate; (c2) a control circuit unit for controlling the flow sensing unit; and (c3) a diaphragm formed in a region facing the flow sensing unit of the rear surface opposite to the main surface of the semiconductor substrate, wherein a part of the chip mounting unit, a part of each of the plurality of leads, a part of the semiconductor chip, and the plurality of wires are sealed with a sealing body formed of resin in a state in which the flow sensing unit formed on the semiconductor chip is exposed, and wherein an upper part of the semiconductor chip is partially covered with the resin in an optional cross-section parallel to a traveling direction of a gas that flows above the exposed flow sensing unit.