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TPS745-Q1: TPS74501PQWDRVRQ1 为什么原厂出来的货芯片上的丝印字体会有些不清晰;怎么芯片上会出现金属的东西?

Part Number: TPS745-Q1

TPS74501PQWDRVRQ1  泰国产地  22+的DC  为什么原厂出来的货芯片上的丝印字体会出现不清晰的现象,再者,怎么芯片上会出现金属的东西?