The 2N4859UB from Microchip Technology is a RF Transistor with Supply Voltage 30 V, Voltage - Drain-Source (Vdss) 0.75 V, Voltage - Gate-Source (Vgs) -30 V(Gate-Source Breakdown Voltage), Drain Current 50 to 175 mA, Collector Current (Ic) 0.175 A. Tags: Surface Mount. More details for 2N4859UB can be seen below.