Patent ID: 8030731

Claim:
An isolated diode comprising: a semiconductor substrate of a first conductivity type, the substrate not comprising an epitaxial layer; a floor isolation region of a second conductivity type opposite to the first conductivity type submerged in the substrate; an annular filled trench extending downward from a surface of the substrate to a depth that is less than a top of the floor isolation region, the filled trench comprising a dielectric material; an annular sidewall region of the second conductivity type extending from a bottom of the dielectric-filled trench at least to the top of the floor isolation region, wherein the floor isolation region, filled trench and sidewall region together enclose an isolated pocket of the substrate; an anode region of the first conductivity type disposed in the isolated pocket, the anode region enclosing an anode contact region of the first conductivity type and an emitter region of the second conductivity type; an anode electrode overlying the surface of the substrate, and being in electrical contact with the anode contact region and the emitter region; and a cathode electrode overlying the surface of the substrate, and in electrical contact with the sidewall region and the floor isolation region.