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TVS - Thyristors

P2353UATP(Unidirectional and Bidirectional Avalanche Type Thyristors) is a special device that is used for low-voltage, direct current, or alternating current rectification applications. It is based on a semiconductor structure, wherein different types of voltage and current affecting the behavior of the device is managed. The P2353UATP application includes rectification of AC into DC, surge protector, power switching etc.

Working Principle

The structure of the P2353UATP is a three layer PNPN diode. It consists of two P layers on both sides forming a P region and an N layer in the centre forming an N region. The P layer channels works like two sides of a bridge and form two terminals for the thyristor. At the same time the N layer creates the third terminal for the device.

To provide current through it, the thyristor needs to be fired. The firing state of P2353UATP is reached when the anode voltage reaches a certain value which is called the cut-off voltage or the break-over voltage, VBO. This firing in turn provides the necessary current flow through the device.

The P2353UATP can be used in unidirectional and bidirectional devices as well. In a unidirectional device, the current can flow only in one direction whereas a bidirectional device permits current to flow in both directions. The unidirectional P2353UATP is commonly used in AC to DC rectification whereas bidirectional devices are used in power switching and many other circuit protected applications.

Coupled Measures

In order to operate the P2353UATP properly, there are several coupled measures that need to be taken. The most important one is the provision of an external gate circuit to fire the thyristor. This gate circuit is very important to provide the control over the current, i.e., the ability to turn it off.

The external current limiting resistor is also necessary to make sure that the thyristor is not damaged. Finally, the series capacitor must be carefully designed to ensure that it reaches the correct breakdown voltage. This is very important for the stability of the device when operating with AC currents.

Conclusion

In conclusion, the P2353UATP can be used in a variety of applications depending on the user’s needs. From rectification of AC current to surge protection, it provides a versatile solution for low-power rectification tasks. Moreover, the fact that both unidirectional and bidirectional devices are available enabled engineers to design reliable and efficient power systems. Finally, it also requires proper design of the external coupling elements such as the gate, current limiting resistor, and series capacitor to protect the device from high-voltage damage.

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