VE17M00551K--

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A varistor is a voltage-dependent resistor used to protect circuits against overvoltage transients. This type of device is often referred to, informally, as a transient voltage suppressor (TVS). Varistors and TVSs are a type of surge protection component (SPDs) that protect sensitive electronics or electrical equipment from power surges, such as the ones caused by lightning strikes.

The VE17M00551K is a TVS device manufactured by Vishay, a global leader in the development and production of passive electronic components. This device is an automotive-grade overvoltage protection device suitable for a variety of applications, such as Electromagnetic Compatibility (EMC), safety ground, HVIL line protection, and automotive LED lighting protection.

The VE17M00551K device is designed for surge and transient overvoltage protection and can provide up to 17 A of peak surge current through its bidirectional device. This device features a low clamping ratio, a high surge current durability, and repetitive peaks. It also offers high surge energy rating, robust design, EMI/RFI protection, and integrated construction in a single-package design.

The VE17M00551K is an unidirectional TVS device which acts as a bidirectional EMI filter when used in combination with a pair of capacitors of equal values. The capacitors form a low-pass filter, while the TVS clamps the transient voltage below a given clamping voltage. The VE17M00551K offers a maximum clamping voltage of 17V, which allows it to protect systems from voltage transients up to 17V.

The working principle of a TVS is based on the principle of reverse avalanche breakdown, which occurs when a large enough reverse electric field is applied across a PN junction diode, resulting in the breakage of the diode depletion layer. When the electric field across the junction gets above a certain threshold, free electrons become accelerated and gain enough energy to break the covalent bond of the atoms in the depletion layer. This causes a current spike which clamps the transient voltage.

The VE17M00551K can be used in a variety of applications such as board-level protection, automotive electronics, I/O lines, protection of ESD sensitive circuits, and more. It is well-suited for protecting automotive electronics, and it can be used in automotive LED lighting, HVIL line protection, and safety ground applications.

In conclusion, the VE17M00551K is an automotive-grade TVS device from Vishay which offers up to 17A of peak surge current protection and up to 17V of protection from overvoltage transients. This device is suitable for a variety of applications, such as board-level protection, automotive electronics, I/O lines, and protection of ESD sensitive circuits. The device is based on the principle of reverse avalanche breakdown and is designed for surge and transient overvoltage protection.

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