74AC138MTR by STMicroelectronics Design and production,in Hong Kong QX Electronics Limited Spot sales,And can pass Hong Kong QX Electronics Limited Purchasing。74AC138MTR Price reference $ 0。74AC138MTR - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information 74AC138MTR Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial