LM2904YST by STMicroelectronics Design and production,in Hong Kong QX Electronics Limited Spot sales,And can pass Hong Kong QX Electronics Limited Purchasing。LM2904YST Price reference $ 0.450000。LM2904YST - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information LM2904YST Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial