LM393M by TI Design and production,in HongKong RichShine Technology Co., Limited Spot sales,And can pass HongKong RichShine Technology Co., Limited Purchasing。LM393M Price reference $ 1.120000。LM393M - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information LM393M Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial