The PMBFJ109 from NXP Semiconductors is a Junction Field Effect Transistor (JFET) with Gate Source Voltage -25 V, Drain Source Resistance 12 Ohm, Gate Current 50 mA, Power Dissipation 0.25 W, Input Capacitance 15 to 85 pF. Tags: Surface Mount. More details for PMBFJ109 can be seen below.