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A low-trigger high-robustness scr device and protection circuit for transient suppressor

A high robustness, transient suppression technology, applied in circuits, semiconductor devices, electrical solid devices, etc., can solve problems such as affecting reliability and poor controllability, and achieve the effect of improving controllability and operational reliability

Active Publication Date: 2022-01-04
四川上特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing SCR device can reduce the trigger voltage, the controllability is poor, and the charge accumulation of the capacitor in the SCR device will affect the reliability of the SCR device operation

Method used

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  • A low-trigger high-robustness scr device and protection circuit for transient suppressor
  • A low-trigger high-robustness scr device and protection circuit for transient suppressor
  • A low-trigger high-robustness scr device and protection circuit for transient suppressor

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Embodiment Construction

[0016] The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention.

[0017] It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0018] Please see figure 1 and figure 2 , figure 1 A cut-away structure diagram of a low-trigger high-robustness SCR device provided by an embodiment of the present invention; figure 2 An equivalent circuit diagram of an SCR device with low triggering and high robustness provided for an embodiment of the present invention.

[0019] In one embodiment, an embodiment of...

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Abstract

The invention provides a low-trigger high-robustness SCR device and protection circuit for a transient suppressor, through the first N-type heavily doped region, the first P well, the N well, and the second P well connected to the anode port Type heavily doped region constitutes the first SCR device; composed of a second P type heavily doped region connected to the anode port, a second P well, an N well and a third N type heavily doped region connected to the cathode port The second SCR device is formed; at the same time, an RC circuit is formed through the second P well, N well, first gate oxide layer, and second gate oxide layer; through the third N-type heavily doped region, the fourth N-type heavily doped region and the second gate oxide layer constitute a parasitic NMOS device, which improves the controllability and operational reliability of the SCR device.

Description

technical field [0001] The invention relates to the technical field of electrostatic protection of integrated circuits, in particular to a low-trigger high-robustness SCR device and a protection circuit for a transient suppressor. Background technique [0002] Electrostatic discharge is one of the important branches of integrated circuit reliability. Integrated circuits may be damaged by ESD (Electro-Static discharge, electrostatic discharge) during manufacturing, transportation and use. In integrated circuits, diodes, MOSFETs, and SCR devices can all be used as ESD protection devices, among which SCR devices are one of the most efficient ESD protection devices. SCR devices are capable of withstanding high ESD currents due to their low holding voltage; therefore, SCR devices are inherently highly ESD robust. Compared with other ESD protection devices, SCR devices have the strongest ESD protection capability per unit area. Although the existing SCR device can reduce the tri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L27/02
CPCH01L27/0262
Inventor 冯永刘继之李健儿胡仲波李慕轩
Owner 四川上特科技有限公司
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