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保护二极管是一种齐纳二极管。齐纳二极管不仅可以用作保护二极管,还可以用作稳压器。保护二极管专门用于保护电路免受ESD和其他瞬变脉冲的影响。相比之下,用于稳压的齐纳二极管击穿模式下保持导通。
保护二极管
保护二极管用作浪涌保护电压钳。这类二极管在电路施加电压过大时导通。
稳压二极管
当小电流(IZ)从阴极(K)流到阳极(A)时,二极管两端的电压可用作恒压源(VZ)。可用功率受二极管允许功耗及安装板允许功耗的限制。