LM139DR by TI Design and production,in HongKong RichShine Technology Co., Limited Spot sales,And can pass HongKong RichShine Technology Co., Limited Purchasing。LM139DR Price reference $ 1.550000。LM139DR - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information LM139DR Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial