2SB970 Si PNP EPITAXIAL PLANAR / 2SB977 2SB977A Si PNP EPITAXIAL PLANAR DARLINGTON / 2SC1547 Si NPN PLANAR2SB970 PNP硅外延平面/ 2SB977 2SB977A PNP硅外延平面达林顿/ 2SC1547硅NPN平面