Patent ID: 7030476

Claim:
A rectifier diode device comprising: a conductive base including a first surface having a substantially planar structure, a trench having a predetermined depth and a predetermined width and formed below an outer peripheral portion of the first surface, a post formed unitarily and extending from an outer peripheral portion of the trench and having a predetermined height, the height of the post being larger than the width of the trench by 3.0 to 3.4 times, a second surface formed at an outer peripheral portion of the post in vertical relation to the first surface, and a third surface formed at a lower portion of the second surface in opposition to the first surface; a semiconductor chip connected to the first surface of the conductive base via a first connection member; a conductive lead connected to an upper surface of the semiconductor chip via a second connection member, the conductive lead having at least one slot formed at a lower surface of the conductive lead; and insulating resin for encapsulating the first surface of the conductive base between an outer portion of the semiconductor chip and the outer peripheral portion of the first surface, the trench, the outer portion of semiconductor chip and the conductive lead while exposing an upper portion of the conductive lead and the second and third surfaces of the conductive base to an exterior.