The G3R40MT12J from GeneSiC Semiconductor is a MOSFET with Continous Drain Current 34 to 66 A, Drain Source Resistance 40 to 57 milliohm, Drain Source Breakdown Voltage 1200 V, Gate Source Voltage -10 to 20 V, Gate Source Threshold Voltage 1.8 to 2.7 V. Tags: Surface Mount. More details for G3R40MT12J can be seen below.