CN2220L8G

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TVS stands for Transient Voltage Suppression, indicating a process of limiting and suppressing voltage spikes or electrical surges in electronic devices. A TVS device is usually used for surge protection, as it helps to regulate and control the inrush of current, enhance signal integrity and improve system performance, by providing a low-impedance path to divert the surge current. Common TVS devices include varistors and Metal Oxide Varistors (MOVs). In this document, we will discuss the application fields and working principle of a specific TVS product, CN2220L8G.

What is CN2220L8G?

CN2220L8G is an AC, Bidirectional Varistor, with a disc-shape and a total thickness of 2 mm. This device has a low leakage current, wide operating voltage range, and extremely low capacitance, making it suitable for a number of applications. It has a high peak power surge capability and can be used to suppress surges from 0.5A to 8A (8/20μs).

Applications of CN2220L8G

Given its low leakage current, high peak power surge capability and wide operating voltage range, the CN2220L8G is suitable for a variety of applications. It is primarily used in telecom systems, power supplies, audio and video equipment, white products, and lighting systems. In addition, it is also popularly used in the medical field as a way to reduce electromagnetic interference (EMI) and radio frequency interference (RFI).

Working Principle

To understand how the CN2220L8G works, let\'s first discuss how a varistor functions. A varistor is essentially a voltage-dependent (nonlinear) resistor. This means that it offers a low or zero resistance when there is no voltage and increases its resistance when voltage is applied across its terminals. When the device is exposed to an abnormal voltage, the resistor reduces its resistance and diverts the current to the ground, thereby protecting the circuits. The below illustration shows how a bidirectional varistor works.

The image above shows a bidirectional varistor being used to protect two vulnerable circuits from an abnormal voltage. The varistor is connected in parallel with the rest of the circuit, forming a low impedance path that provides a ground for the surge current. The varistor acts as a voltage-controlled switch that is closed in the event of a surge, providing a low-resistance path from the point of surge to the ground. Thus, it helps to protect the circuits against surges caused by inductive loads, lightning, and short circuit faults.

Conclusion

The CN2220L8G is a TPF-approved disc-shaped varistor that is used for various applications such as telecom systems, power supplies, audio and video equipment, white products, and lighting systems. It has a low leakage current, high peak power surge capability, and extremely low capacitance, making it suitable for surge suppression. It functions by providing a low-impedance path that diverts the surge current to the ground.

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