3KP150A

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TVS - Diodes: 3KP150A Application Field and Working Principle

A Transient Voltage Suppression diode (TVS diode) is a special type of semiconductor device which can protect electrical equipment from damage due to high over-voltage transients. The 3KP150A is a TVS diode specifically designed to protect AC lines and other sensitive equipment such as computers and electronic devices from power surges.

The 3KP150A is a 15A, ultra-fast, unidirectional silicon-controlled-rectifier (SCR) diode with a peak pulse power dissipation capability of up to 1500 watts. It is designed to dissipate high instantaneous surge currents caused by fast transients across the power lines, providing reliable shielding for sensitive electronic circuitry. Its tight voltage regulation ensures optimum surge protection. This diode is commonly used with AC line filters and surge diverters for protection against transient over-voltages up to 1500 watts.

The 3KP150A TVS diode\'s operation and performance is based on two principles, avalanche breakdown and Zener effect. Avalanche breakdown is a phenomenon in which a reverse-biased junction is subjected to a very high electric field and momentarily conducts current. The high electric field causes electrons in the reverse-biased junction to accelerate and collide with the nuclei, causing electron-hole pairs to be released. These electron-hole pairs are then swept across the junction, causing it to momentarily conduct current.

The Zener effect is also a phenomenon in which a reverse-biased junction is subjected to a very high electric field. When the electric field exceeds a particular threshold, the reverse-biased junction breaks down and a large quantity of minority carriers are injected into the junction. These minority carriers then combine and the excess energy is released as an avalanche break down current, resulting in a sharply increasing reverse voltage across the junction. The avalanche breakdown effect causes the voltage to remain constant after the excess energy is released, resulting in a low-voltage reverse current. This low-voltage reverse current provides the required protection by limiting the surge voltage across the circuit.>

The unique combination of avalanche breakdown and Zener effects enable the 3KP150A to provide reliable protection against transient over-voltages up to 1500 watts. The device is designed for high-speed switching applications with low turn-on time and low capacitance allowing it to provide fast and effective transient protection of sensitive AC lines and components. It can also be used with AC line filters and surge diverters to provide effective protection of electrical equipment from damage caused by transient over-voltages. The 3KP150A is a cost-effective solution for providing reliable surge protection to AC lines and other sensitive equipment.

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