1V5KE440A Circuit Protection

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TVS - Diodes are a type of semiconductor device used to protect sensitive electronic circuits from high voltage transients such as those caused by electrostatic discharge, lightning, voltage spikes, and so on. The TVS-diode 1V5KE440A is designed to protect circuits in a variety of industrial and automotive applications. This article provides an overview of 1V5KE440A application field and working principle.

Application Field

The 1V5KE440A TVS-diode is designed for use in communication and networking systems, such as Ethernet, USB, and other industrial and automotive applications. It provides a fast response time of less than 8 ns and high surge attacks of up to 440 A. This makes the 1V5KE440A suitable for electromagnetic interference (EMI) filtering and overvoltage protection. It is designed to absorb up to 400 W surge power and protect circuits operating on voltages up to 18 Vdc.

The 1V5KE440A is compatible with a variety of mounting styles, such as SMT board, press-fit, and through-hole. It is also compatible with various dielectric materials, including polyester and surface mount PCBs. The 1V5KE440A features low leakage current, low impedance, a low clamping voltage, and a low dynamic resistance. It offers a high surge protection capability with a peak pulse power rating of 660 W.

Working Principle

The 1V5KE440A is a TVS-diode based on metal-oxide varistor (MOV) technology. The construction of the 1V5KE440A consists of a silicon diode, an MOV in a ceramic housing, and an auxiliary diode. MOVs absorb the voltage spikes and current surges and limit their effect on the connected circuit. The MOV is connected in parallel to the diode, and the diode is connected in series to the auxiliary diode. Together, these components form the 1V5KE440A TVS-diode.

When exposed to a surge voltage, the MOV clamping voltage quickly rises and limits the effect of the voltage spike on the connected circuits. As the spike disappears, the voltage across the MOV quickly drops back to a safe level. The auxiliary diode prevents the current from flowing in the reverse direction and protects against current surge.

The 1V5KE440A is designed to be used in conjunction with other surge protection devices. It provides fast response times and high surge handling capacity, making it effective in protecting against transient voltage overloads. The 1V5KE440A is an ideal choice for Ethernet, USB, and other industrial and automotive applications.

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