MPLAD18KP150A Circuit Protection

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TVS - Diodes are a variant of the Zener diode and are widely used for protection of electrical and electronic circuits against overvoltage transients such as electrostatic discharges, electrical fast transients, and lightning surges. The MPLAD18KP150A is an example of such a diode with a peak power dissipation of 150W and a breakdown voltage of 18kV.

The primary function of the MPLAD18KP150A is to channel large overvoltage transients away from sensitive circuitry. When such a surge occurs, the diode "clamps" the voltage to its breakdown voltage, limiting its maximum value, thus providing protection for downstream components. The MPLAD18KP150A is capable of handling very large transients (including the high currents seen from lightning strikes) as well as the occasional smaller transient from static discharges.

Unlike Zener diodes, TVS diodes can handle high-frequency transients as well as slow-changing voltages, making them ideal for protecting sensitive components from both high-frequency noise and longer-term overvoltage conditions. TVS devices tend to have lower dynamic resistance and less leakage current compared to their Zener counterparts, meaning they can offer higher protection for sensitive components.

In addition to voltage protection, TVS diodes can also reduce the effects of inductive kick-back voltage. When an inductive load is switched off (such as a motor or transformer) an arc can be generated (often referred to as a \'flyback\') due to the back-EMF generated by the collapsing magnetic field. This arc can cause damage to the switching circuitry so the TVS diode can be placed across the switching contacts to short-circuit the arc and protect the circuitry.

The working principle of the MPLAD18KP150A is based on the fact that when a voltage that is greater than the breakdown voltage is applied, current will flow in the device. This current is known as the clamping current and is proportional to the applied voltage, hence the device\'s name (Transient Voltage Suppressor). With the MPLAD18KP150A the breakdown voltage is 18kV and the peak pulse current is 850A.

The main application areas for a MPLAD18KP150A include automotive electronic systems, DC power supplies, telecom systems, electronic data processing, industrial equipment, aircraft and military applications. In addition to its overvoltage protection capabilities, TVS diodes like the MPLAD18KP150A are often used in circuits to reduce EMI (electromagnetic interference).

In summary, the MPLAD18KP150A is a transient voltage suppressor diode designed to protect sensitive electronic and electrical equipment from large transient voltages such as those generated by electrostatic discharge, electrical fast transients, and lightning strikes. Its breakdown voltage is 18kV and its peak pulse current is 850A. Its primary application areas include automotive electronics, telecoms, data processing, industrial equipment, aircraft and military systems and it can also be used to reduce EMI.

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