15KPA180A-B

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Transient voltage suppression, commonly referred to as TVS, is a type of electrical device designed to protect components from voltage or current spikes. The 15KPA180A-B is one such device that is commonly used to protect against damage caused by momentary surges. In this article, we will explore its application field and working principle.

The 15KPA180A-B, a symmetrical double-diode TVS, is used in a variety of applications such as mobile UIs, computers, consumer electronics, and other sensitive electrical equipment. Manufactured in a surface mount SOT-23 package, it is designed to withstand up to 5kA of lightning surge current and 500W of steady-state power dissipation. It also has a relatively fast response time and a low clamping voltage.

The 15KPA180A-B is composed of two zener diodes with a breakover voltage of 18V. The diodes are connected in series with both polarities and connected to the same anode. In normal operation, they work in reverse bias and act as an open circuit. When the external voltage reaches or exceeds the breakover voltage, the two diodes become forward biased and act as a closed circuit, diverting the excess current away from the circuit and its components.

The two zener diodes can also be thought of as thermally coupled voltage regulators. When the external voltage surpasses the 18V breakover voltage, it triggers an avalanche process, which releases a large amount of energy in the form of heat. This heat is then shared between the two zener diodes, allowing them to regulate the voltage by controlling how much current is diverted away from the circuit.

The 15KPA180A-B can be used in both overvoltage and transient voltage suppression applications. In overvoltage applications, it is used to divert excess voltage above the regulated rating. In transient voltage suppression, it is used to divert high-voltage spikes or surges that may be caused by lightning, electrostatic discharges, or other transient sources. It can help protect sensitive components from voltage spikes that may otherwise cause damage or unexpected behavior.

To summarize, the 15KPA180A-B is a type of symmetrical double-diode TVS device. It is made in a surface mount SOT-23 package and is rated for up to 5kA of lightning surge current and 500W of steady-state power dissipation. It works by diverting excess current away from the circuit, regulating the voltage with two thermally coupled voltage regulators. This device is commonly used in applications that require protection from voltage or current spikes and is ideal for applications such as mobile UIs, computers, and consumer electronics.

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