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Lm1117丝印问题

LM1117IMPX-3.3V(SOT-223)和 LM1117MPX-3.3这两个料是不是一个是工业级别,一个是民用级别?实物丝印都是N05B,怎么区分这两个实物?上面还有什么别的印字么?