The FF2MR12W3M1H_B11 from Infineon Technologies is a MOSFET with Continous Drain Current 400 A, Drain Source Resistance 1.44 to 3.09 milliohm, Drain Source Breakdown Voltage 1200 V, Gate Source Voltage -10 to 23 V, Gate Source Threshold Voltage 3.45 to 5.15 V. Tags: Surface Mount. More details for FF2MR12W3M1H_B11 can be seen below.