The J300JF from New Jersey Semiconductor is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 6 to 30 mA, Gate Source Voltage 25 V, Forward Transfer Admittance 4.5 to 200 mS, Continous Drain Current 1 nA, Drain Source Breakdown Voltage 10 V. Tags: Through Hole. More details for J300JF can be seen below.