The varistor is a voltage-limiting protection device. Utilizing the nonlinear characteristics of the varistor, when overvoltage occurs between the two poles of the varistor, the varistor can clamp the voltage to a relatively fixed voltage value, thereby protecting the subsequent circuit. The main parameters of the varistor are: varistor voltage, current capacity, junction capacitance, response time, etc.

　　The response time of the varistor is ns level, which is faster than the air discharge tube and slightly slower than the TVS tube. Generally, its response speed can meet the requirements for over-voltage protection of electronic circuits. The junction capacitance of a varistor is generally in the order of hundreds to thousands of Pf. In many cases, it is not suitable to be directly used in the protection of high-frequency signal lines. When used in the protection of AC circuits, its large junction capacitance will increase leakage. Current needs to be fully considered when designing protective circuits. The flow capacity of the varistor is larger, but smaller than that of the gas discharge tube.

　　The biggest feature of the varistor is that when the voltage applied to it is lower than its threshold "UN", the current flowing through it is extremely small, equivalent to a closed valve. When the voltage exceeds UN, its The resistance becomes smaller, which causes the current flowing through it to surge without much change in the impact on other circuits, thereby reducing the impact of overvoltage on subsequent sensitive circuits. Using this function, abnormal overvoltage that often occurs in the circuit can be suppressed and the circuit can be protected from overvoltage damage.

　　Professional manufacturer of ESD chip varistors - Huaju Electronics, an expert in ESD protection. Huaju Electronics produces various low-capacity electrostatic protection varistors - the ESD varistor series to protect your electronic products and completely get rid of electrostatic belts. Interference comes. The ultra-low-capacity ESD varistor developed by the company is mainly used in some high-speed signal transmission interface applications. It can eliminate static electricity while ensuring that the signal is not distorted. It is mainly used in USB2.0, USB3.0, IEEE1394, DVI and high-speed Ethernet. network and other high-speed data transmission ports. Huaju Electronics - an expert in the protection of electronic products.

　　1. Application scope of SMD varistor:

　　·Protect components and circuits from ESD generated on power supply, control and signal lines

　　·Provide line overvoltage protection for ICCMOS and MOSFET.

　　·Can replace surface mount TVS Zener diodes in many fields

　　·Used to assist various terminal products to achieve electromagnetic compatibility

　　2. Specific applications of chip varistors:

　　·Laptops, digital cameras, PDAs, mobile phones, MP3s, motherboards, routers, automotive electronics, LCD modules, Internet phones, microphones and headsets, etc.

　　3. Model name, appearance structure and dimensions:

　　3.SMD varistor appearance structure and size: (mm)

1.0402 Basic electrostatic protection products:

2.0603 Basic electrostatic protection products:

2.0805 basic electrostatic protection products:

2. Low-capacity electrostatic protection products:

2.1 Characteristics and applications

Temperature characteristics of varistor voltage

2.1 Static elimination test circuit and waveform diagram

2.3 Recommended capacitance values ​​for transmission in each system

3 Product specifications of polymer ultra-low capacitance static suppressor

3.1. Reliability

3.2. Packaging

3.3. Application areas: USB, HDMI, IEEE1394, DVI, high-speed Ethernet and other high-speed data transmission ports.