SN74HC138D by Texas Instruments(TI) Design and production,in Hong Kong QX Electronics Limited Spot sales,And can pass Hong Kong QX Electronics Limited Purchasing。SN74HC138D Price reference $ 0.510000。SN74HC138D - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information SN74HC138D Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial