MMBT39047F MMBT3904-7-F MMBT3904-7-F MOS(场效应管) MMBT3904-7-F original MMBT3904-7-F/K1N MMBT3904-7-F/NOPB MMBT3904-7-F-52 MMBT3904-7-F-79 MMBT3904-7-F-82 MMBT3904-7-F-88