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TL431BIDBZR丝印印字(device marking)问题

现在有两种器件上丝印字母“T3FS”,型号应该都是TL431BIDBZR。其中有些器件3和F上面有上划线,S有下划线;有些器件3上面有上划线,F下面有下划线。

请问这两种不同标示器件的差异在什么地方?