The J177 from New Jersey Semiconductor is a Junction Field Effect Transistor (JFET) with Gate Source Voltage 30 V, Continous Drain Current 1.5 to 20 mA, Drain Source Breakdown Voltage ±30 V, Drain Source Resistance 300 Ohm, Gate Current 50 mA. Tags: Through Hole. More details for J177 can be seen below.