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Unidirectional TVS: A TVS device with asymmetrical

current versus voltage (I−V) properties. A unidirectional

TVS is best suited for protecting circuit nodes whose signals

are unidirectional or always above or below the reference

voltage, usually ground.

Bidirectional TVS: A TVS device with symmetrical I−V

properties. A bidirectional TVS is best suited for protecting

electrical nodes whose signals are bidirectional or can have

voltage levels both above and below the reference voltage,

usually ground

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