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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.
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3-1正常工作状态（无ESD事件）的主要特性（3）
3-1（3） 信号极性（即信号电压是否像模拟信号一样穿过接地（GND）电位）
考虑到要保护的信号线的极性，有必要选择单向或双向ESD保护二极管。不同类型的二极管用于仅正向摆动的未调制数字信号（例如，0V（逻辑低电平）与5V（逻辑高电平）之间），以及电压可正可负的无偏压模拟信号。双向ESD保护二极管可用于高于和低于GND范围的信号，如下图所示。（单向和双向二极管均可用于电压仅为正或仅为负的信号。)
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