The FF3MR12KM1 from Infineon Technologies is a MOSFET with Continous Drain Current 375 A, Drain Source Resistance 2.83 to 4.33 milliohm, Drain Source Breakdown Voltage 1200 V, Gate Source Voltage -10 to 20 V, Gate Source Threshold Voltage 3.45 to 5.15 V. Tags: Chassis Mount. More details for FF3MR12KM1 can be seen below.