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TL431: B

Part Number: TL431


两次购买的TL431BRDBZR电源基准芯片,现在发现丝印不一样。想问一下这个丝印代表什么意思,怎么区分?我的芯片丝印为T3F3和T3FG.在一些网上资料也没有这些这个丝印说明。一些元器件代理商也没找到相同丝印的元器件。有没有什么比较可靠的代理商推荐。除了立。谢谢!