The PN4858 from InterFET is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 8 to 80 mA, Gate Source Voltage -40 V, Drain Source Resistance 60 Ohm, Gate Current 50 mA, Gate Reverse Current -500 nA. Tags: Through Hole. More details for PN4858 can be seen below.