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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
TOSHIBA is not responsible for any incorrect or incomplete information. Information is subject to change at any time without notice.
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Is it necessary to use bidirectional TVS diodes (ESD protection diodes) to protect against both positive and negative ESD events?
The static electrical characteristics of unidirectional and bidirectional TVS diodes are shown below.
Like typical Zener diodes, unidirectional TVS diodes are used with the reverse-biased condition. When the IC under protection is in normal operation, unidirectional TVS diodes are reverse biased, and the signal that can be applied to the protected line can be in the range of 0 V to VRWM. However, TVS diodes absorb both positive and negative ESD events.
Therefore, when only a positive voltage is applied to the signal line to be protected during normal operation, unidirectional TVS diodes can be used to absorb both positive and negative ESD events.
When both positive and negative voltage are applied to the signal line to be protected, use bidirectional TVS diodes.