The 4N47 from ISOCOM is a RF Transistor with Gain 300 dB(DC current gain), Supply Voltage 0.7 to 1.5 V(Forward Voltage), Collector Current (Ic) 0.5 to 0.7 mA, Base Current (Ib) 30 uA(On State Collector Base), Power Dissipation (Pdiss) 60 to 300 mW. Tags: Through Hole. More details for 4N47 can be seen below.