Solid electrolytic capacitor with face-down terminals, manufacturing method of the same, and lead frame for use therein

Abstract

A face-down terminal solid electrolytic capacitor with the increased strength between electrode terminals and a casing resin is provided. The face-down terminal solid electrolytic capacitor has a structure where a mold structure in which a lead frame and capacitor elements fixed to the lead frame are overmolded with a casing resin is cut along cutting planes respectively passing through an anode terminal forming portion and a cathode terminal forming portion of the lead frame so that end surfaces of an anode terminal and a cathode terminal are exposed. In the lead frame, the anode terminal forming portionand the cathode terminal forming portionare provided so as to face each other. The anode terminal forming portion has a concave portionon the board mount side and a convex portionon the opposite side, which are formed by deforming part of the anode terminal forming portion in a direction perpendicular to a board mount surface. The concave portion is applied with plating. The convex portion has a flat portion parallel to the board mount surface and serving as a welding margin, an inclined portioncontinuous with the flat portion and inclined so as to approach the board mount surface as going away from the flat portion, and projecting portionson lateral sides of the convex portion. By cutting along a cutting plane, the anode terminal is formed so as to have a cut end surface, a fillet surface, and a board mount surface as exposed surfaces.