LM139ADT by STMicroelectronics Design and production,in Hong Kong QX Electronics Limited Spot sales,And can pass Hong Kong QX Electronics Limited Purchasing。LM139ADT Price reference $ 0.760050。LM139ADT - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information LM139ADT Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial