The BF259 from Central Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 4 V, Collector Base Voltage 30 V, Collector Cut off Current 50 nA, Collector Emitter Breakdown Voltage 300 V, Collector Emitter Voltage 25 V. Tags: Through Hole, NPN Transistor. More details for BF259 can be seen below.