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Transient voltage suppressor and preparation method thereof

A transient voltage suppression, conductivity type technology, applied in electric solid devices, circuits, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. circuit board and other problems, to achieve the effect of enhancing anti-surge capability, multiple current paths, and improving surge current and working power

Active Publication Date: 2020-12-15
浙江昌新生物纤维股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has obvious limitations, because when the area of ​​the PN junction continues to increase, it means that the area of ​​the device becomes larger, and the package shell used in the package will also increase accordingly, which is different from the miniaturization of the device in electronic products. The requirements are contrary to the requirements, and the size of the device is too large to be soldered on the circuit board with high-density electronic components, which may even affect the normal use of the device on the circuit board

Method used

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  • Transient voltage suppressor and preparation method thereof
  • Transient voltage suppressor and preparation method thereof
  • Transient voltage suppressor and preparation method thereof

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Embodiment Construction

[0025] In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without one or more of these details. In other examples, some technical features known in the art are not described in order to avoid confusion with the present invention.

[0026] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "transverse", "longitudinal", "horizontal", "inner", "outer" etc. indicate The orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the invention is used, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the...

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Abstract

A transient voltage suppressor includes a substrate, a plurality of trench regions formed on an upper surface of the substrate at intervals and extending into the substrate, each trench region includes a first trench and a second trench spaced apart, the first trench is filled with a first polysilicon layer, the second trench is filled with a second polysilicon layer, a third polysilicon layer formed on the upper surface of the substrate and covering the trench region, a first metal layer formed on an upper surface of the third polysilicon layer, a plurality of first implantation regions formed on a lower surface of the substrate at intervals and extending into the substrate, A plurality of first injection regions and a plurality of trench regions are disposed in a one-to-one manner, a plurality of second injection regions of a second conductivity type are formed between the plurality of first injection regions, and a second metal layer formed on the lower surface of the substrate andcovering the lower surfaces of the first injection region and the second injection region. The invention also provides a preparation method of the transient voltage suppressor, which improves the surge prevention ability and the working power of the transient voltage suppressor.

Description

technical field [0001] The invention relates to the technical field of semiconductor device manufacturing, in particular to a transient voltage suppressor and a preparation method thereof. Background technique [0002] A transient voltage suppressor (Transient Voltage Suppressor, TVS) is a clamp overvoltage protection device, which can fix the surge voltage at a relatively low voltage level in a short period of time, so that the back-end circuit is protected from overvoltage It is mainly used in various interface circuits, such as mobile phones, tablets, TVs, and computer hosts, where there are a large number of transient voltage suppressors. At present, with the continuous development of electronic products, especially in the field of high-power power supply and power management chips, correspondingly higher technical requirements are put forward for transient voltage suppressors, which not only require transient voltage suppressors to be able to withstand up to several tho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L27/02H01L29/06H02H9/04
CPCH01L27/0207H01L27/0248H01L29/0615H02H9/04
Inventor 不公告发明人
Owner 浙江昌新生物纤维股份有限公司
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