Datasheet > UNIDIRECTIONAL

UNIDIRECTIONAL

更新时间： 2022-01-19 17:23:00

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Unidirectional and Bidirectional Operation (34k)

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UNIDIRECTIONAL 数据手册

SI96-05

Surging Ideas

TVS Diode Application Note

PROTECTION PRODUCTS

Unidirectional & Bidirectional Operation

Unidirectional Protection

Figure 1 illustrates a large transient at the input of a

circuit protected by a unidirectional TVS diode. During

the positive spike, the TVS diode junction is reversed

biased. The device acts in avalanche mode as the

transient current i₁flows. The spike is clamped at or

below the maximum clamping voltage of the device.

During the negative spike, the TVS diode junction is

forward biased. The negative spike is clamped to one

diode drop as the device conducts i₂in the forward

direction.

Figure 1 - Unidirectional Device

(Asymmetric Clamping)

Bidirectional Protection

Figure 2 illustrates a large transient at the input of a

circuit protected by a bidirectional TVS diode. The

positive and negative spikes are both clamped at or

below the maximum clamping voltage of the device.

During the positive spike, D₁conducts in the forward

direction (i₃) and D₂is reversed biased conducting in

avalanche mode. The action is reversed (i₄) for the

negative spike.

Figure 2 - Bidirectional Device

(Symmetrical Clamping)

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Revision 9/2000

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