Electrostatic discharge protection device and electronic device having the same
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United States of America Patent
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Oct 24, 2017
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N/A
app pub date -
Jul 27, 2015
filing date -
Dec 8, 2014
priority date (Note) -
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Abstract
In an ESD protection device, a first well of a first conductivity type and a second well of a second conductivity type are formed in a substrate to contact each other. A first impurity region of the first conductivity type and a second impurity region of the second conductivity type are formed in the first well, and are electrically connected to a first electrode pad. The second impurity region is spaced apart from the first impurity region in a direction of the second well. A third impurity region is formed in the second well, has the second conductivity type, and is electrically connected to a second electrode pad. A fourth impurity region is formed in the second well, is located in a direction of the first well from the third impurity region to contact the third impurity region, has the first conductivity type, and is electrically floated.
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