Four layer overvoltage protection device having buried regions aligned with shorting dots to increase the accuracy of overshoot voltage value
US5479031A · kind A · utility
27Cited by
3References
46Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1993 |
| Grant date | Dec 26, 1995 |
| Priority date | — |
| Expiry date | Sep 10, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S257/914
Abstract
An overvoltage protection device having multiple shorting dots in the emitter region and multiple buried regions substantially aligned with these shorting dots. The placement, number, and area of these buried regions reduce and more accurately set the overshoot voltage value of the device while maintaining the high surge capacities of the device. Further, doping types and concentrations have been modified from that known in the prior art to reduce overshoot providing a more accurate and sensitive overvoltage protection device than that known previously in the prior art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.