LM393D by Texas Instruments Design and production,in Shenzhen Jungu Technology Electronics Co., Ltd. Spot sales,And can pass Shenzhen Jungu Technology Electronics Co., Ltd. Purchasing。LM393D Price reference $ 0.574000。LM393D - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information LM393D Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial