The FDBL0065N40 from onsemi is a MOSFET with Continous Drain Current 300 A, Drain Source Resistance 0.65 milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 4 V. Tags: Surface Mount. More details for FDBL0065N40 can be seen below.