A semiconductor thyristor device that incorporates buried region breakdown junctions
laterally offset from an emitter region. By spacing the buried regions around the
emitter region, current carriers emitted from the buried regions are distributed
over a large area of the emitter region, thereby providing a high current capability
during initial turn on of the device. In order to achieve low breakover voltage
devices, the buried regions are characterized with high impurity concentrations,
with the breakdown junctions located near the surface of the chip. The low voltage
thyristor device minimizes the area of high dopant concentration junctions, thus
minimizing the chip capacitance and permitting high speed, low voltage signal operation.