The BF513 from NXP Semiconductors is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 10 to 18 mA, Forward Transfer Admittance 3.5 to 7.0 mS, Continous Drain Current 30 mA, Gate Current 10 mA, Power Dissipation 0.25 W. Tags: Surface Mount. More details for BF513 can be seen below.