Abstract: An ESD protection device includes a substrate having an active fin extending in a first direction, a plurality of gate structures extending in a second direction at a given angle with respect to the first direction and partially covering the active fin, an epitaxial layer in a recess on a portion of the active fin between the gate structures, an impurity region under the epitaxial layer, and a contact plug contacting the epitaxial layer. A central portion of the impurity region is thicker than an edge portion of the impurity region, in the first direction. The contact plug lies over the central portion of the impurity region.

Abstract: An ESD protection device includes a substrate having an active fin extending in a first direction, a plurality of gate structures extending in a second direction at a given angle with respect to the first direction and partially covering the active fin, an epitaxial layer in a recess on a portion of the active fin between the gate structures, an impurity region under the epitaxial layer, and a contact plug contacting the epitaxial layer. A central portion of the impurity region is thicker than an edge portion of the impurity region, in the first direction. The contact plug lies over the central portion of the impurity region.

Abstract: A semiconductor device may include an active fin, an element isolation film on a lower portion of the active fin and a gate structure crossing over the active fin. The gate structure may include first and second sides. The device may also include a source region and a drift region adjacent the first and second sides of the gate structure, respectively. The drift region may have a first impurity concentration. The device may further include a drain region that is in the drift region and may have a second impurity concentration higher than the first impurity concentration, a first trench that is in the drift region and may have a depth less than a height of the active fin, and an upper embedded insulating layer in the first trench. The gate structure may overlap a portion of the drift region and a portion of the first trench.

Abstract: An ESD protection device includes a substrate having an active fin extending in a first direction, a plurality of gate structures extending in a second direction at a given angle with respect to the first direction and partially covering the active fin, an epitaxial layer in a recess on a portion of the active fin between the gate structures, an impurity region under the epitaxial layer, and a contact plug contacting the epitaxial layer. A central portion of the impurity region is thicker than an edge portion of the impurity region, in the first direction. The contact plug lies over the central portion of the impurity region.

Abstract: An ESD protection device includes a substrate having an active fin extending in a first direction, a plurality of gate structures extending in a second direction at a given angle with respect to the first direction and partially covering the active fin, an epitaxial layer in a recess on a portion of the active fin between the gate structures, an impurity region under the epitaxial layer, and a contact plug contacting the epitaxial layer. A central portion of the impurity region is thicker than an edge portion of the impurity region, in the first direction. The contact plug lies over the central portion of the impurity region.

Abstract: A semiconductor device may include an active fin, an element isolation film on a lower portion of the active fin and a gate structure crossing over the active fin. The gate structure may include first and second sides. The device may also include a source region and a drift region adjacent the first and second sides of the gate structure, respectively. The drift region may have a first impurity concentration. The device may further include a drain region that is in the drift region and may have a second impurity concentration higher than the first impurity concentration, a first trench that is in the drift region and may have a depth less than a height of the active fin, and an upper embedded insulating layer in the first trench. The gate structure may overlap a portion of the drift region and a portion of the first trench.

Abstract: A semiconductor device including a first fin pattern and a second fin pattern which have respective short sides facing each other and are separated from each other, a first field insulating layer which is around the first fin pattern and the second fin pattern, a second field insulating layer and a third field insulating layer which are between the first fin pattern and the second fin pattern, a first gate which is formed on the first fin pattern to intersect the first fin pattern, a second gate which is formed on the second field insulating layer, and a third gate which is formed on the third field insulating layer, wherein upper surfaces of the second and third field insulating layers protrude further upward than an upper surface of the first field insulating layer, and a distance between the first gate and the second gate is equal to a distance between the second gate and the third gate.

Abstract: A test pattern of a semiconductor device is provided, which includes first and second fins formed to project from a substrate and arranged to be spaced apart from each other, first and second gate structures formed to cross the first and second fins, respectively, a first source region and a first drain region arranged on the first fin on one side and the other side of the first gate structure, a second source region and a second drain region arranged on the second fin on one side and the other side of the second gate structure, a first conductive pattern connected to the first and second drain regions to apply a first voltage to the first and second drain regions and a second conductive pattern connecting the first source region and the second gate structure to each other.

Abstract: An ESD protection device includes a substrate having an active fin extending in a first direction, a plurality of gate structures extending in a second direction at a given angle with respect to the first direction and partially covering the active fin, an epitaxial layer in a recess on a portion of the active fin between the gate structures, an impurity region under the epitaxial layer, and a contact plug contacting the epitaxial layer. A central portion of the impurity region is thicker than an edge portion of the impurity region, in the first direction. The contact plug lies over the central portion of the impurity region.

Abstract: A test pattern of a semiconductor device is provided, which includes first and second fins formed to project from a substrate and arranged to be spaced apart from each other, first and second gate structures formed to cross the first and second fins, respectively, a first source region and a first drain region arranged on the first fin on one side and the other side of the first gate structure, a second source region and a second drain region arranged on the second fin on one side and the other side of the second gate structure, a first conductive pattern connected to the first and second drain regions to apply a first voltage to the first and second drain regions and a second conductive pattern connecting the first source region and the second gate structure to each other.

Abstract: A field effect transistor includes a first substrate region having a channel region and a second substrate region where a heavily doped region is formed. The channel region includes a first portion having a first width and a second portion having a second width larger than the first width. Related fabrication methods are also described.

Abstract: An electrical fuse includes first and second active regions doped with respective first-type and second-type impurities that form a horizontal P/N junction, first and second spaced apart silicide layers on respective portions of the top surfaces of the first and second active regions, and first and second contacts on the respective top surfaces of the first and second silicide layers. When a first reverse voltage that is higher than a threshold voltage is applied to the electrical fuse through the first and second contacts, the P/N junction is broken down by a reverse current flowing between the first and second active regions so that the electrical fuse is rendered conductive in response to a second reverse voltage that is less than the threshold voltage.

Abstract: A semiconductor device may include an active region of a semiconductor substrate and first and second impurity regions in the active region. The active region may have a first conductivity type, the first and second impurity regions may have a second conductivity type opposite the first conductivity type, and the first and second impurity regions are spaced apart to define a channel region therebetween. A first source/drain region may be provided in the first impurity region, a second source/drain region may be provide in the second impurity region, the first and second source/drain regions may have the second conductivity type, and impurity concentrations of the first and second source/drain regions may be greater than impurity concentrations of the first and second impurity regions.

Abstract: A field effect transistor includes a first substrate region having a channel region and a second substrate region where a heavily doped region is formed. The channel region includes a first portion having a first width and a second portion having a second width larger than the first width. Related fabrication methods are also described.