The 3N166 from CALOGIC is a MOSFET with Continous Drain Current 50 mA, Drain Source Resistance 300 ohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -40 to 40 V, Gate Source Threshold Voltage -2.0 to -5.0 V. Tags: Through Hole. More details for 3N166 can be seen below.