Patent ID: 7095084

Claim:
A monolithic structure effective to implement an emitter switching configuration, comprising at least one bipolar transistor and a MOS transistor having a common conduction terminal; at least one substrate having a first conductivity type whereon a first buried layer having a second conductivity type and a second buried layer having said first conductivity type are formed, said first and second buried layers covered by an epitaxial layer having said first conductivity type, said first buried layer forming, by means of first wells of said second conductivity type a control terminal of said bipolar transistor, and said second buried layer forming said common conduction terminal; and second wells of said first conductivity type, adjacent to said first wells of said second conductivity type and in contact with said first wells and with said second buried layer to define a Zener diode parallel to a junction defined by said first and second buried layers with a node of the Zener diode coupled to the control terminal of the bipolar transistor and a cathode coupled to the common conduction terminal.