LM2931D-R by STMicroelectronics Design and production,in Hong Kong QX Electronics Limited Spot sales,And can pass Hong Kong QX Electronics Limited Purchasing。LM2931D-R Price reference $ 0.880000。LM2931D-R - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information LM2931D-R Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial