Low-capacitance low-clamping overvoltage protection device

Abstract

The invention relates to a low-capacitance low-clamping overvoltage protection device. The invention is characterized in that the overvoltage protection device is formed by connecting a low-capacitance TVS (Transient Voltage Suppressor) tube and a low-clamping tube in parallel, the low-capacitance TVS tube is used for low-capacitance path and primary surge / ESD (Electronic Static Discharge) protection, and the low-clamping tube is used to lower the clamping voltage of the whole device, wherein the cathode of low-capacitance TVS tube is connected with the anode of the low-clamping tube, the anode of the low-capacitance TVS tube is connected with the cathode of the low-clamping tube and the clamping output end of the low capacitance TVS tube is connected with the gate control end of the low-clamping tube. The invention has the advantages that a low capacitance low clamping TVS device is formed on the basis of the low capacitance characteristics of a PIN (positive-intrinsicnegative diode) tube and low pass-state voltage drop characteristic of the low clamping tube, the problem of the traditional multi-level protection which can not meet the requirement of low capacitance and low residual voltage of high-speed data can be overcome; meanwhile, a three-terminal low-capacitance low-clamping TVS used for common-mode and differential-mode protection can be realized, and the capacitance of differential application is lower; and a low-clamping high-surging-capability two-way two-terminal VTS can be realized.

Description

technical field [0001] The invention relates to the field of semiconductor overvoltage protection devices, in particular to a low-capacity and low-clamp overvoltage protection device, which is a low-clamp transient voltage suppression device. Background technique [0002] In the past few decades, the microelectronics manufacturing process with silicon as the main processing material has changed from the initial few micron technology to the current 0.13μm technology, and the integration of integrated circuit chips has become higher and higher, and the cost has become lower and lower. As the size of the chip shrinks, the overvoltage capability that the circuit can withstand is gradually reduced, and the system will be more sensitive to external voltage fluctuations. This requires that the residual voltage of the protection device be controlled at very low level. [0003] At the same time, due to the continuous development of electronic application requirements, modern integra...

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Problems solved by technology

[0004] Although the transient voltage suppressor has been widely used in various protection fields as an effective surge / ESD protection device, based on the above considerations, before introducing the transient voltage suppressor into the circuit design, we cannot sacrifice the signal of the system At the expense of integrity and system security, introduce various existing suppressors into interface protection

[0005] There are two major problems in traditional Zener TVS tubes, one is that low capacitance and high surge cannot be obtained at the same time, and the other is that the problem of coexistence of low clamping and high capacitance has not been resolved

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