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B72220Q0251K101 application field and working principle

B72220Q0251K101 is a varistor device (also known as voltage dependent resistor, VDR) used as a protection against transient, overvoltage faults in electrical circuit.

A varistor device is a two-terminal semiconductor device which exhibits a nonlinear, voltage-dependent response. A varistor device has a relatively steep knee-like characteristic curve which demonstrates sharply increased conductance with voltage, allowing the device to be applied between a source of fixed electrical potential and a given load in order to shunt away transients and dissipate a large amount of energy.

In the case of B72220Q0251K101, the device is specifically constructed to protect electrical circuits from transient voltage which is more than the rated voltage of the device. It has a rated voltage of 250V, a hold voltage of 135V and a discharge peak current of 590A.

The working principle of B72220Q0251K101 is based on the use of a nonlinear resistor network composed of series and parallel pairs of silicon diodes. The series diode chain acts as a voltage limiter, when the voltage in the device\'s circuit rises above the diode\'s knee voltage, the voltage will be limited due to the breakdown of the junctions, resulting in increased coupling. The parallel network, consisting of the same type of diodes, provide a shunt path for the high transient current, resulting in an effective short circuit, dissipating the energy of the transient.

Applications for the B72220Q0251K101 device include protection of consumer electronics such as TVs, computers, and other electrical devices in residential environments; surge protection for telecommunications and power systems; and protection for industrial electronics from lightning and other transient voltage.

In summary, B72220Q0251K101 is a varistor device typically used to protect electronic equipment against transient overvoltage in residential, industrial and telecommunications power system applications. It relies on a complex network of series and parallel pairs of silicon diodes to limit voltage, and shunt the transient current to dissipate energy.

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