发明授权
- 专利标题: Low capacitance transient voltage suppressor (TVS) with reduced clamping voltage
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申请号: US13170965申请日: 2011-06-28
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公开(公告)号: US08698196B2公开(公告)日: 2014-04-15
- 发明人: Lingpeng Guan , Madhur Bobde , Anup Bhalla , Jun Hu , Wayne F. Eng
- 申请人: Lingpeng Guan , Madhur Bobde , Anup Bhalla , Jun Hu , Wayne F. Eng
- 申请人地址: US CA Sunnyvale
- 专利权人: Alpha and Omega Semiconductor Incorporated
- 当前专利权人: Alpha and Omega Semiconductor Incorporated
- 当前专利权人地址: US CA Sunnyvale
- 代理机构: JDI Patent
- 代理商 Joshua D. Isenberg
- 主分类号: H01L29/66
- IPC分类号: H01L29/66 ; H01L29/06
摘要:
A low capacitance transient voltage suppressor with reduced clamping voltage includes an n+ type substrate, a first epitaxial layer on the substrate, a buried layer formed within the first epitaxial layer, a second epitaxial layer on the first epitaxial layer, and an implant layer formed within the first epitaxial layer below the buried layer. The implant layer extends beyond the buried layer. A first trench is at an edge of the buried layer and an edge of the implant layer. A second trench is at another edge of the buried layer and extends into the implant layer. A third trench is at another edge of the implant layer. Each trench is lined with a dielectric layer. A set of source regions is formed within a top surface of the second epitaxial layer. The trenches and source regions alternate. A pair of implant regions is formed in the second epitaxial layer.
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