The JSM4N65D from JSMicro Semiconductor is a MOSFET with Continous Drain Current 2.5 to 4.0 A, Drain Source Resistance 2.2 to 2.6 ohm, Drain Source Breakdown Voltage 650 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2.0 to 4.0 V. Tags: Surface Mount. More details for JSM4N65D can be seen below.