B72214S0151K151

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TVS - Varistors, MOVs

The B72214S0151K151 is an example of a transient voltage suppressor. It is a bi-directional device, which acts as a protective shield in sensitive electronic systems. In its simplest form, it helps guard against electrical surges, voltage spikes, overvoltage, electrostatic discharge, and similar hazardous and damaging events. This type of TVS protects against voltage transients in circuits by offering an extremely fast response time.

Varistors, which are also known as metal-oxide-varistors, are the most commonly used TVS for surge protection. A varistor is a two-terminal device consisting of a semi-conductive material, typically ceramic or a polymeric, filled with metal oxide particles. During normal operation, the varistor appears as an open circuit, where the two terminals are isolated from each other. When an over-voltage spike occurs, however, the electrical field of the spike forces electrons through the resistive layer of the semiconductor, creating a conducting path between the two terminals. This acts as an immediate short-circuit, providing an outlet for the instantaneous surge of power.

Though both are over-voltage protectors, metal-oxide varistors are different from metal-oxide surge protectors (MOVs) in that they do not act as a resistor for large-amplitude spikes. As they are able to withstand higher levels of voltage stress, varistors are more widely used for lightning protection, while MOVs are particularly suited for detecting gradual increases in voltage levels over long periods of time. In either form, however, both devices offer an important line of defense for your equipment.

The B72214S0151K151 is designed to meet the surge protection requirements of the EN 61000-4-5 standard. The device is designed to withstand 1500 Amperes of peak surge current, which is nearly double the UL497A surge current rating of 1300 Amperes. It also has an 8/20 microsecond surge current rating of 58 KA, which is also significantly higher than the UL497A rating. This means the B72214S0151K151 is capable of safely dissipating the high currents seen in transient voltage spikes, protecting your circuits from catastrophic failure and data loss.

As for how it works, the device operates based on the principle of capacitive coupling. When an over-voltage surge is encountered, the device essentially charges up like a capacitor, allowing it to temporarily absorb the energy from the surge. This process allows it to rapidly respond to the surge, diverting the excess energy away from your system and helping to protect your sensitive circuitry.

In conclusion, the B72214S0151K151 is an example of a transient voltage suppressor. It is a bi-directional device, which acts as a protective shield in sensitive electronic systems. Varistors, which are also known as metal-oxide-varistors, are the most commonly used type of TVS for surge protection, while metal-oxide surge protectors (MOVs) are particularly suited for detecting gradual increases in voltage levels over long periods of time. The B72214S0151K151 is designed to meet the surge protection requirements of the EN 61000-4-5 standard and operates based on the principle of capacitive coupling.

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