The 2N4399 from Mospec Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Base Emitter Saturation Voltage 2.5 V, Emitter Cut off Current 10 mA, Collector Base Voltage 60 V, Collector Cut off Current 10 mA. Tags: Through Hole, PNP Transistor. More details for 2N4399 can be seen below.