The 4N23 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) 0.2 to 6 mA, Power Dissipation (Pdiss) 60 to 300 mW, Input Capacitance 5 pF. Tags: Through Hole. More details for 4N23 can be seen below.