An SCR device and ESD protection circuit for suppressing secondary hysteresis

Abstract

The invention belongs to the technical field of electronic circuits and provides an SCR device and an ESD protection circuit used for suppressing secondary hysteresis. The SCR device comprises a firstthyristor, a main SCR branch and a parasitic SCR branch. The main SCR branch comprises a second bipolar transistor and the parasitic SCR branch comprises a P-well resistor and a P-substrate resistor,wherein the P-well resistor and the P-substrate resistor are the base region resistors of the third bipolar transistor, and the P-well resistor and the P-substrate resistor are the base region resistors of the third bipolar transistor. One end of the P-substrate resistor and the first end of the P-well resistor are co-connected to the electrical cathode, and the second end of the P-well resistorand the base of the second bipolar transistor are co-connected to the collector of the first bipolar transistor; As that parasitic SCR branch assists the main SCR branch to conduct, the main SCR branch is easier to conduct, a problem that the secondary hysteresis phenomenon of the SCR device due to multiple trigger in the traditional technology and thus full ESD protection over the chip cannot berealized is prevented effectively.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, in particular to an SCR device and an ESD protection circuit for suppressing secondary hysteresis. Background technique [0002] With the rapid development of electronic technology, chips are gradually being used more and more commonly in the structural design of circuits; when the chip is in use, it needs to be driven by a power supply to maintain normal work; however, in electronic circuits, the chip is due to There will be more electrostatic charges during the working process. When the electrostatic charges accumulate to a certain amount, there will be a high electrostatic current inside the chip. At this time, the chip will output electric energy to the external electronic circuit to release the internal static electricity. Current, that is, the electrostatic discharge (ElectroStatic Discharge, ESD) phenomenon of the chip; due to the electrostatic discharge phenomenon of the chip ...

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Problems solved by technology

[0004] The invention provides an SCR device and an ESD protection circuit for suppressing secondary hysteresis, aiming at solving the problem that the SCR device in the existing ESD protection circuit will have a secondary hysteresis phenomenon due to multiple triggers, thereby causing the SCR device to fail to protect the chip. The Problem With Comprehensive ESD Protection

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