The FF45MR12W1M1_B11 from Infineon Technologies is a MOSFET with Continous Drain Current 25 A, Drain Source Resistance 45 to 66 milliohm, Drain Source Breakdown Voltage 1200 V, Gate Source Voltage -10 to 20 V, Gate Source Threshold Voltage 3.45 to 5.55 V. Tags: Chassis Mount. More details for FF45MR12W1M1_B11 can be seen below.