摘要:
The disclosed semiconductor switching device is comprised of a PNPN or NPNP structure having four semiconductor regions, one region of the two central regions having a higher specific resistivity and sandwiched between a centrally positioned junction and one of end junctions of three PN junctions formed between the four regions. The central region of higher specific resistivity has impurities for controlling the lifetime of carriers, and its concentration distribution being such that the impurity concentration of that portion adjacent to the central junction is higher than that of the portion adjacent to the abovementioned end junction.
摘要:
A two-terminal thyristor device including a thyristor combined with a field effect transistor having a firing voltage that is dependent upon the pinch-off voltage of the field effect transistor. The field effect transistor is connected to reverse bias the PNP emitter-base junction until the applied voltage increases to the value at which the field effect transistor becomes pinched off. At this point the product of the PNP gain and NPN gain is greater than unity, and the device switches to a conducting mode. The field effect transistor establishes the holding current in the conduction mode for the switching device.
摘要:
A semiconductor device having a plurality of semiconductor elements formed in a monolithic manner in a semiconductor wafer of a first conductivity type while being sequentially arranged, in which each of the plurality of semiconductor elements consists of at least a collector region formed in the semiconductor wafer and having the first conductivity type and higher conductivity than the semiconductor wafer, a base region formed in the semiconductor wafer and having the first conductivity type and higher conductivity than the semiconductor wafer, and a relatively small emitter region formed in the semiconductor wafer between the base and collector regions and having a second conductivity type, at least the emitter region of each semiconductor element being adapted for exclusive use therewith and each semiconductor element presenting a current controlled negative resistance characteristic between the emitter and collector regions with a biasing power source being applied between the base and collector regions, and in which the distance between two adjacent ones of the semiconductor elements is selected so that when one of the two adjacent semiconductor elements is in the on state with the biasing power source being applied between the base and collector regions of the two semiconductor elements, the turnover voltage of the other semiconductor element may become low. A shift register, photoelectric conversion apparatus, logic functional circuit or apparatus and so on which employ such a semiconductor device.
摘要:
A bidirectional switching semiconductor device comprising a pair of four layer switching semiconductor devices which are connected in reverse parallel with each other; the base layers of respective devices being electrically connected to each other, thereby improving the turn-on characteristics of the device.
摘要:
An inverse gate semiconductor controlled rectifier device including a base region, and main and auxiliary emitter regions respectively forming a main and auxiliary PN junction with the said base region is provided with a conductive layer located on the surface of the base region in ohmic contact therewith and extending from adjacent the auxiliary emitter junction to alongside an edge of the main emitter junction but not of itself bridging either the main or auxiliary junction. The conductive layer, in operation, expands a preferential current path between the auxiliary emitter and main emitter along the said edge.
摘要:
An integrated switching system is described comprising transverse and lateral thyristors, the latter being connected to trigger or turn on the transverse thyristor. Both thyristors are made in the same wafer by a planar process, the additional lateral thyristor being made simultaneously with regions of the transverse thyristor thereby minimizing additional processing steps.
摘要:
A semiconductor controlled rectifier having an auxiliary cathode region and a main cathode region with a main control gate lead disposed adjacent to the auxiliary cathode region. The controlled rectifier including the auxiliary cathode region can be fired by a relatively low gate current. The output current of the auxiliary cathode region is connected to auxiliary gates disposed in proximity to the main cathode and supplies necessary current for turning on the main portion of the controlled rectifier.