Surge protective device having a surface collector region directly shorted to a base region
First Claim
1. A surge protective device, comprising:
- a collector region of a first conductivity type provided on a semiconductor substrate;
a base region of a second conductivity type disposed at a surface portion of said collector region;
an emitter region of a first conductivity type disposed within said base region, said base region and said emitter region collectively forming a voltage-regulation diode in which said emitter region makes up a cathode and said base region makes up an anode; and
a surface collector region of said first conductivity type disposed at said surface portion of said collector region, said surface collector region being directly shorted to said base region by a wire.
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Accused Products
Abstract
A surge protective device, which has a favorable surge-absorbing characteristic while avoiding increase in chip area and in process complexity, is disclosed. In a surge protective device having an ordinary planar bipolar transistor structure and having a voltage-regulation diode to absorb surge current by breakdown of a junction between an emitter region and base region thereof, a surface collector region thereof is shorted to the base region. Accordingly, when surge current is increased, a pn junction between a collector region and the base region is sufficiently forward biased, and thereby a backward transistor is formed. Surge current is sufficiently absorbed by the operation of the backward transistor.
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Citations
11 Claims
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1. A surge protective device, comprising:
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a collector region of a first conductivity type provided on a semiconductor substrate; a base region of a second conductivity type disposed at a surface portion of said collector region; an emitter region of a first conductivity type disposed within said base region, said base region and said emitter region collectively forming a voltage-regulation diode in which said emitter region makes up a cathode and said base region makes up an anode; and a surface collector region of said first conductivity type disposed at said surface portion of said collector region, said surface collector region being directly shorted to said base region by a wire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A surge protective device, comprising:
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a collector region of an N conductivity type provided on a semiconductor substrate; a base region of a P conductivity type disposed at a surface portion of said collector region; an emitter region of said N conductivity type disposed within said base region, said base region and said emitter region collectively forming a voltage-regulation diode in which said emitter region makes up a cathode and said base region makes up an anode; and a surface collector region of said N conductivity type disposed at said surface portion of said collector region, wherein said surface collector region and said base region are connected to a low-level power-supply line, and said emitter region is connected to a high-level power-supply line. - View Dependent Claims (11)
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Specification