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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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为什么有两种电流传输比：CTR和CTR（饱和）？
电流传输比（CTR）取决于LED电流IF和晶体管集电极和发射极电压VCE。对于典型的晶体管输出光耦，在IF＝5mA和VCE＝5V条件下规定了CTR。但VCE＝5V是非饱和区域的条件。在使用光耦的应用中，经常会传输ON和OFF数字信号。这种情况下，在ON状态下，光耦会进入饱和区域。因此，也可在CTR要求中设置饱和条件（对于东芝，VCE＝0.4V或0.3V），并将此条件下的CTR定义为CTR（饱和）。
示例：晶体管输出光耦TLP385示例
