LM339D by Texas Instruments(TI) Design and production,in Shenzhen Nanyuxin Electronics Co., Ltd. Spot sales,And can pass Shenzhen Nanyuxin Electronics Co., Ltd. Purchasing。LM339D Price reference $ 0.407719。LM339D - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information LM339D Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial