1V5KE170A Circuit Protection

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TVS - Diodes

Transient Voltage Suppression or TVS Diodes, are specialized diodes installed across conductors and circuits to absorb or clamp voltage spikes. These voltage spikes happen because of fast or momentary surges of power, lightning strikes, inductive transients, ESD (electro-static discharge), electrical noise and other related phenomenon.TVS diodes are also known as Transil diodes, and clamping diodes. In other words, they absorb transient currents, protecting circuits from over-voltages. Usually made out of zinc oxide, these diodes come in several different types, including unidirectional (for unidirectional surges, such as lightning) and bidirectional (for bidirectional surges such as from radio transmitters).

The 1V5KE170A is one type of TVS diode that is especially designed to absorb surges of current in excess of 17,000 watts. Built using patented and trademarked MOS-technology, the 1V5KE170A ensures maximum surge protection of high-speed data lines, and is perfect for heavy-duty commercial applications. It has high-speed response times, and an excellent thermal & electrical performance.

Working Principle

The 1V5KE170A uses an integrated circuit with two diodes that are connected in series, called a double-diode. This double diode has a Zener diode and Avalanche diode, both of which provide voltage protection in different ways.

The Zener diode prevents positive voltage transients, providing a low-voltage clamp which limits the voltage across a pair of terminals connected to the diode. The Avalanche diode is designed to clamp current surges, allowing it to monitor the flux flow through the diodes without increasing its conduction voltage. When the voltage goes beyond the specified limit, the Avalanche diode operates as a Shunt through which the excess current can be dissipated. This feature is important for protection against induced electrical noise such as electrostatic discharge (ESD).

Application Field

The 1V5KE170A is specifically designed for the protection of high capacitance circuits with high operating voltages. It is also ideal for applications such as personal computers, central processing units, audio-visual equipment, hard drives, motors, switches and other equipment, which are all vulnerable to surges of high energy. The 1V5KE170A can also be used in a wide range of industrial applications, notably applications with voltage-sensitive components, such as those found in the automotive and telecommunications sectors. It is particularly useful for protection of circuits with long lines, where it can serve to protect against dropouts, overvoltage events, and other similar types of power anomalies. The 1V5KE170A is one of the most advanced types of TVS diodes available, with excellent surge protection performance that surpasses most other diodes of its kind. Its versatility, fast response time, robust voltage protection, and long-term reliability make it a popular choice for the protection of high-voltage applications.

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