Patent ID: 6979883

Claim:
An Integrated device in emitter switching configuration, said device being integrated in a chip of semiconductor material of a first conductivity type, said chip having a first surface and a second surface opposite to each other, said device comprising: a first transistor having a base region, an emitter region and a collector region; a second transistor having a not drivable terminal for collecting charges, which is connected with the emitter terminal of the first transistor; and a quenching element that discharges current from the first transistor when said second transistor is turned off, said quenching element being coupled with the base region of the first transistor and with the not drivable terminal of the second transistor, said quenching element having at least one Zener diode made in polysilicon, said at least one polysilicon Zener diode being formed on the second surface of said chip and comprising a polysilicon layer having at least one zone of the first conductivity type and at least one zone of a second conductivity type in order to form at least one P-N junction, wherein the emitter region of the first transistor extends as a comb having elongated portions inside the base region and the polysilicon region includes a plurality of zener diodes distributed along a perimeter of the elongated portions.