OPA991IDBVR by TI Design and production,in SEMICON INTL HK CO LTD Spot sales,And can pass SEMICON INTL HK CO LTD Purchasing。OPA991IDBVR Price reference $ 1.400000。OPA991IDBVR - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information OPA991IDBVR Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial