Patent ID: 8431958

Claim:
A transient voltage suppressing (TVS) device disposed on a semiconductor substrate having a ground terminal disposed on a bottom surface and a Vcc terminal disposed on a top surface of the substrate wherein the TVS device comprising: a high side steering diode and a low side steering diode integrated with a Zener diode for suppressing a transient voltage wherein said high side steering diode comprises a PN junction disposed below the top surface of said semiconductor substrate contacting a high side I/O pad connected to a low side I/O pad of said low side steering diode; wherein the high side and low side I/O pads are interconnected and disposed on the top surface of the semiconductor substrate and wherein said high side steering diode is further integrated with the Zener diode constituting a PN junction connected to the Vcc terminal through a doped region near the top surface of said semiconductor substrate wherein the Zener diode is triggered for conducting a current along a vertical direction when an input voltage from the I/O pads is higher than the Vcc voltage; and said high side steering diode and said Zener diode are formed between two isolation trenches filled with an insulation material partially insulating a semiconductor region with said Zener diode comprising the PN junction continuously extending substantially over an entire lateral length between the isolation trenches wherein said semiconductor region between the two isolation trenches including only dopant regions constituting as vertical diodes to function only as said high side steering diode and said Zener diode in the semiconductor region.