Invention Grant
- Patent Title: Low capacitance transient voltage suppressor (TVS) with reduced clamping voltage
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Application No.: US13170965Application Date: 2011-06-28
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Publication No.: US08698196B2Publication Date: 2014-04-15
- Inventor: Lingpeng Guan , Madhur Bobde , Anup Bhalla , Jun Hu , Wayne F. Eng
- Applicant: Lingpeng Guan , Madhur Bobde , Anup Bhalla , Jun Hu , Wayne F. Eng
- Applicant Address: US CA Sunnyvale
- Assignee: Alpha and Omega Semiconductor Incorporated
- Current Assignee: Alpha and Omega Semiconductor Incorporated
- Current Assignee Address: US CA Sunnyvale
- Agency: JDI Patent
- Agent Joshua D. Isenberg
- Main IPC: H01L29/66
- IPC: H01L29/66 ; H01L29/06

Abstract:
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.
Public/Granted literature
- US20130001694A1 LOW CAPACITANCE TRANSIENT VOLTAGE SUPPRESSOR (TVS) WITH REDUCED CLAMPING VOLTAGE Public/Granted day:2013-01-03
Information query
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