The IRFD320 from Vishay is a MOSFET with Continous Drain Current 0.49 A, Drain Source Resistance 1800 milliohm, Drain Source Breakdown Voltage 400 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Through Hole. More details for IRFD320 can be seen below.