LM2904ST by STMicroelectronics Design and production,in Hong Kong QX Electronics Limited Spot sales,And can pass Hong Kong QX Electronics Limited Purchasing。LM2904ST Price reference $ 0.118800。LM2904ST - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information LM2904ST Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial