L7987TR by STMicroelectronics Design and production,in Shenzhen Jungu Technology Electronics Co., Ltd. Spot sales,And can pass Shenzhen Jungu Technology Electronics Co., Ltd. Purchasing。L7987TR Price reference $ 1.417392。L7987TR - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information L7987TR Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial