ELECTROSTATIC PROTECTION ELEMENT
First Claim
1. An electrostatic protection element to be provided in a semiconductor substrate, comprising:
- a semiconductor substrate of a first conductivity type;
a first impurity layer of a second conductivity type, which is a conductivity type opposite to the first conductivity type, provided in the semiconductor substrate;
a second impurity layer of the first conductive type provided in the first impurity layer functioning as a gate;
a third impurity layer of the second conductive type provided in the second impurity layer functioning as a cathode;
a fourth impurity layer of the second conductive type provided in the first impurity layer spaced apart from the second impurity layer at a distance;
a fifth impurity layer of the first conductive type provided in the fourth impurity layer functioning as an anode; and
a sixth impurity layer of the second conductive type provided in the fourth impurity layer, whereinan impurity concentration of the fourth impurity layer is higher than that of the first impurity layer, and a bottom of the fourth impurity layer is deeper than that of the second impurity layer.
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Abstract
An electrostatic protection element relating to the present invention comprises a P-type semiconductor and an N-type first impurity layer provided in the semiconductor substrate. The first impurity layer comprises a P-type second impurity layer functioning as a gate. The second impurity layer comprises an N-type third impurity layer functioning as a cathode. Further, the first impurity layer comprises an N-type fourth impurity layer spaced apart from the second impurity layer at a distance. The fourth impurity layer comprises a P-type fifth impurity layer functioning as an anode and an N-type sixth impurity layer. Then, in the electrostatic protection element, an impurity concentration of the fourth impurity layer is higher than that of the first impurity layer, and a bottom of the fourth impurity layer is deeper than that of the second impurity layer.
15 Citations
16 Claims
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1. An electrostatic protection element to be provided in a semiconductor substrate, comprising:
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a semiconductor substrate of a first conductivity type; a first impurity layer of a second conductivity type, which is a conductivity type opposite to the first conductivity type, provided in the semiconductor substrate; a second impurity layer of the first conductive type provided in the first impurity layer functioning as a gate; a third impurity layer of the second conductive type provided in the second impurity layer functioning as a cathode; a fourth impurity layer of the second conductive type provided in the first impurity layer spaced apart from the second impurity layer at a distance; a fifth impurity layer of the first conductive type provided in the fourth impurity layer functioning as an anode; and a sixth impurity layer of the second conductive type provided in the fourth impurity layer, wherein an impurity concentration of the fourth impurity layer is higher than that of the first impurity layer, and a bottom of the fourth impurity layer is deeper than that of the second impurity layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification