V5.5MLA0805LH Circuit Protection

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The V5.5MLA0805LH is a 5.5mm Lead-free multilayer varistor (MLV) used in applications involving transient voltage suppression. This type of varistor is particularly noted for its high surge capability, low profile, and small size. It is most commonly used in the automotive and consumer electronic industries, as well as for industrial power supplies. It is manufactured in a variety of sizes, from miniature to extended sizes, with a variety of lead and termination materials.

The V5.5MLA0805LH is a non-linear component that offers protection against transients caused by lightning, EMC, or other types of electrical overstress (EOS). The varistor is made from a combination of non-linear elements, such as zinc oxide, which absorb excess current and limit the rise in voltage that could cause destruction of the device. It also has a wide operating temperature range, allowing it to be used in a variety of applications.

The V5.5MLA0805LH is also a thermally protected varistor designed to be used without additional overcurrent protection. It is designed for operations up to 1500A transient and 1000A steady state. Its maximum operating temperature is up to +150°C, and it has a breakdown voltage (the voltage at which the varistor begins to conduct) of 5.5V. Its typical capacitance range is 4~10pF.

Due to its high surge rating and low profile design, the V5.5MLA0805LH is often used in automotive and consumer electronics applications, including automotive ECUs, DC/DC converters, motor control circuits, power supplies, and other power circuits. It is also used in industrial applications, such as power supplies, professional audio, and communications equipment. The varistor is designed to absorb electrical energy and subsequently dissipate it, preventing further damage to components.

The working principle of a varistor is simple. When a voltage higher than its specified breakdown voltage is applied to it, it behaves like a short circuit, allowing current to flow through it. This causes the varistor to heat up, and it begins to absorb energy from the current, dissipating it in the form of heat. This is what is known as the “Body Effect”, and it is the primary mechanism by which varistors protect components from damage due to transient over-voltage.

The V5.5MLA0805LH is a useful component for protecting components in a variety of applications. Its high surge capability and low profile design make it a popular choice for automotive and consumer electronics applications, while its wide operating temperature range makes it suitable for use in industrial power supplies. The simple working principle of the varistor makes it an effective and versatile component for protecting systems from damage due to transient over-voltage.

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