The IRFR310 from Vishay is a MOSFET with Continous Drain Current 1.7 A, Drain Source Resistance 3600 milliohm, Drain Source Breakdown Voltage 400 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for IRFR310 can be seen below.