The FS05MR12A6MA1B from Infineon Technologies is a MOSFET with Continous Drain Current 200 A, Drain Source Resistance 5.5 to 9.1 milliohm, Drain Source Breakdown Voltage 1200 V, Gate Source Voltage -10 to 20 V, Gate Source Threshold Voltage 3.25 to 5.55 V. Tags: Surface Mount. More details for FS05MR12A6MA1B can be seen below.