The SFU291 from Solid State Devices is a Junction Field Effect Transistor (JFET) with Gate Source Voltage -30 V, Continous Drain Current 200 mA, Drain Source Resistance 7.0 Ohm, Power Dissipation 4 W, Operating Temperature -55 to 150 Degree C. Tags: Surface Mount. More details for SFU291 can be seen below.