Semiconductor device for surge protection

Details Semiconductor device for surge protection Semiconductor device for surge protection

2011-08-23

2011-08-23

Nguyen, Cuong Q (Department: 2811)

Active solid-state devices (e.g., transistors, solid-state diode

Field effect device

Having insulated electrode

C257S605000

Reexamination Certificate

active

08004041

ABSTRACT:
A semiconductor device for surge protection having high surge resistance is provided. A semiconductor substrate (10) included in the semiconductor device for surge protection according to the present invention includes a high concentration first conductivity type semiconductor substrate (1), a low concentration first conductivity type semiconductor layer (2), a high concentration first conductivity type semiconductor layer (4), a second conductivity type semiconductor layer (3), and a cylindrical low concentration second conductivity type semiconductor layer (5) that extends from a surface of the low concentration first conductivity type semiconductor layer (2) into the low concentration first conductivity type semiconductor layer (2) so as to share an axis with the high concentration first conductivity type semiconductor layer (4), and has an interface (J4) with the high concentration first conductivity type semiconductor layer (4) and an interface (J5) with the second conductivity type semiconductor layer (3). Further, the low concentration second conductivity type semiconductor layer (5) has an impurity concentration lower than an impurity concentration of the second conductivity type semiconductor layer (3).

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