TS4990IST by STMicroelectronics Design and production,in CHIPS-ORIGIN ELECTRONICS CO.,LIMITED Spot sales,And can pass CHIPS-ORIGIN ELECTRONICS CO.,LIMITED Purchasing。TS4990IST Price reference $ 1.078000。TS4990IST - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information TS4990IST Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial