Zinc oxide varistor is the 1 kind of zinc oxide as the main body, adding a variety of metal oxides as additives, after high temperature sintering in the air made of polycrystalline semiconductor ceramic elements. Varistor is the 1 kind of voltage limiting protection device. The varistor and the protected circuit element are connected in parallel in the circuit, when lightning overvoltage, electrostatic overvoltage or transient operating overvoltage occurs in the circuit. At the same time, using the nonlinear characteristics of the varistor, the varistor will quickly clamp the voltage at both ends to a relatively fixed safe voltage value with a response speed of nanosecond time, so as to avoid the protection of the circuit components from being damaged by the impact of overvoltage.

When the voltage applied to both ends of the varistor is less than its varistor voltage, the varistor is equivalent to an insulation resistance above 10MΩ; When an overvoltage greater than the varistor voltage is applied to both ends of the varistor, the resistance of the varistor drops sharply and presents a low resistance state, thus quickly guiding the charge away and effectively protecting other elements in the circuit.

Multi-layer chip varistor is a chip-packaged varistor. It adopts multi-layer monolithic structure and has the advantages of small parasitic inductance, small size, high SMT efficiency, short response time, high operating temperature and strong protection ability. CNAMPFORT QV2220H series chip varistors are applied to low-voltage circuits within 100V, including DC power supply and low-frequency signal lines for lightning strike and surge protection, absorbing and attenuating pulse energy, absorbing operating overvoltage generated inside the line (rectification, inverse transformation, electromagnetic pulse generated by transformer and line surge) and attenuated lightning induced overvoltage, and being used as secondary protection (TVS that can replace SMAJ/SMBJ), at the same time, some communication interfaces used in mobile phones, LCD-TV/STB/computers, etc. are used for ESD electrostatic protection instead of TVS.

1) SMD small patch, saving space and convenient production;

2) The response time is ns level, and the response speed meets various circuit protection requirements;

3) High surge suppression, the same volume surge capacity is much greater than TVS;

4) Stable high temperature performance, no derating at 125 ℃;

5) Low leakage current IL<10μA;

6) Bidirectional non-polar protection, low clamping voltage;

7) Better than UL94V-0 flammability rating;

8) comply with RoHS environmental standards

9) SMD type, small size suitable for high density mounting

10) Excellent clamping ratio and strong capability of voltage surge suppression

11) Excellent solderability

12) PackagingT: Tape and Reel(1kpcs / reel)

1) Automotive electronic applications: car control unit, electro-hydraulic brake, ABS/ESP, sunroof, window control and other load sudden drop protection and quick start protection;

2) Industrial instrumentation, control and measurement equipment, security cameras, electronic watt-hour meter control board;

3) 5G communication base station, Netcom equipment, network product interface, leakage protector control board;

4) ESD protection of video and audio line I / O port, high-speed data line (such as HDMI, USB 3.0, IEEE 1394 interface, RF antenna, RF module);

5) IEC 61000-4-5 surge protection, IEC 61000-4-4 EFT protection, ESD protection in accordance with IEC 61000-4-2 (level 4)

6) Transient voltage protection and voltage surge suppression for LED lighting

7) Suitable for LCD-TV, STB, Switch, Router, PLC, Security System, smart meters, mobile phones

8) Suppressing Induced / switching over-voltage caused by lightning and power

9) Protecting DC-DC Module, I/O ports, IC driver