Patent ID: 11948933
Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A semiconductor device, comprising:
a semiconductor substrate of a first conductivity type having a first peak dopant concentration, a top side, and a bottom side opposite to the top side;
a first semiconductor region of a second conductivity type opposite to the first conductivity type at a first portion of the top side, wherein:
the first semiconductor region has approximately the first peak dopant concentration and forms a first P-N junction with the semiconductor substrate; and
the first P-N junction forms a junction of a first Zener diode;

a second semiconductor region of the second conductivity type overlying the first semiconductor region, and has a second peak dopant concentration less than the first peak dopant concentration;
a first doped region of the first conductivity type in the second semiconductor region and overlying the first semiconductor region, wherein the first doped region forms a second P-N junction with the second semiconductor region;
a third semiconductor region at a second portion of the top side laterally adjacent to the first semiconductor region and having the first conductivity type and a third peak dopant concentration;
a fourth semiconductor region of the first conductivity type overlying the third semiconductor region and having a fourth peak dopant concentration less than the third peak dopant concentration;
a second doped region of the second conductivity type in the fourth semiconductor region and overlying the third semiconductor region, wherein the second doped region forms a third P-N junction with the fourth semiconductor region;
a third doped region of the second conductivity type contiguous with the bottom side and having approximately the first peak dopant concentration, the third doped region forms a fourth P-N junction with the semiconductor substrate, wherein the fourth P-N junction forms a junction of a second Zener diode;
a first conductor coupled to the first doped region and the second doped region at the top side; and
a second conductor contiguous with the third doped region and the bottom side of the semiconductor substrate.