ITA18B3

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TVS or transient voltage suppression devices are designed to protect electrical devices from damage caused by high voltage transients, primarily resulting from database systems and/or electrical power sources. A TVS diode is a type of voltage protection device that functions as a protective device for protecting against excessive voltage surges. This article discusses the design, application field, and working principle of the ITA18B3 TVS diode in detail.

Design:

The ITA18B3 integrates a transient voltage suppressor and a small signal diode to provide superior circuit protection. It is composed of two silicon die in a hermetically sealed surface mount package. The diode is an integrated resistive and capacitive (RC) circuit. The resistive circuit is used for voltage drop, while the capacitive circuit provides high frequency noise isolation between the source and load. The diode is capable of absorbing a maximum transient peak voltage up to 18 volts and does not introduce significant circuit degradation or capacitive loading.

Application Field:

The ITA18B3 TVS diode is a versatile, low cost protection device that can be used in a variety of applications. It is suitable for use in high-speed bus line transient protection, power line transient protection, and industrial equipment surge protection. It is also suitable for use in data transmission systems, automotive controllers, and industrial equipment. Additionally, it can be used as a surge protection device in communications systems or other power systems.

Working Principle

The working principle of the ITA18B3 TVS diode is based on the principle of “avalanche breakdown”. When the voltage across the diode exceeds the rating of the device, a large current is rapidly injected into the diode. This current then causes the depletion of the avalanche region, creating a voltage drop that reduces the voltage across the diode to a safe level. The resulting current flow is then dissipated by the diode. As the device dissipates the surge current, its internal temperature rises until the diode reaches its rated breakdown voltage, at which point the current flow through the diode stops and the diode goes into a state of self-restoration.

The ITA18B3 TVS diode is an ideal device for providing effective protection against damaging voltage transients. Not only does it offer reliable protection, but it also features a low-cost design, making it an attractive option for a wide variety of applications.

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