0070.9561.A2

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Transient voltage suppression (TVS) devices are widely used in electronic circuits, due to their ability to suppress overvoltages and thus protect against damaging electrical transients. TVSs provide a fast and effective protection for sensitive components, while also providing a safeguard for both the system and the user. The 0070.9561.A2 is one such TVS device—a type of varistor or metal-oxide varistor (MOV).

The Varistor

The 0070.9561.A2 device belongs to the varistor family, which is a broad class of non-linear devices that provide protection against transient voltages. Varistors offer protection against electrical transients such as surges, lightning, and spikes in power lines, as well as other sources such as an EMI/RFI source. Varistors are excellent protection against over and under voltage events, and their speed and protection capabilities make them ideal for most applications.

The Metal-Oxide Varistor (MOV)

A MOV is a type of varistor that is widely used in power supply and protection circuits. MOVs are small, rugged, inexpensive, and easy to install. They are composed of a metal oxide ceramic chip sandwiched between two leads that create a capacitor with varying resistive properties. The resistance of the MOV increases dramatically as soon as the voltage across the lead terminals exceeds its breakdown voltage.

Varistor Operation

When a transient voltage is detected on a protected line, the MOV switches to a high resistance state, allowing current to flow through the device and limiting the peak voltage. The MOV then slowly transitions back to a normal, low-resistance state in order to avoid damage to the connected circuit. This transition is known as a ‘clamping voltage’ and is based on the relative breakdown voltage of the MOV. Generally, higher power MOVs have a higher breakdown voltage, allowing them to protect a wider range of voltages.

Application Field and Working Principle of 0070.9561.A2 Varistor

The 0070.9561.A2 varistor is an excellent choice for protecting sensitive electronic components against transient voltages, such as those resulting from power line spikes, lightning, and EMI/RFI sources. Its small size and low profile make it ideal for use in compact electronic devices, and its low cost makes it an attractive choice for cost-sensitive applications.

The 0070.9561.A2 varistor has a maximum voltage rating of 500V and a current rating of 10A, making it suitable for a wide range of applications. It can be used to protect against overvoltage, undervoltage, and surge, as well as transient voltages. It is designed to switch to a high resistance state when the voltage across the lead terminals exceeds its breakdown voltage, allowing current to flow through the device and limiting the peak voltage. Once the surge is over, the MOV transitions back to a normal, low-resistance state in order to avoid damage to the connected circuit.

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