The B2M040120Z from BASiC Semiconductor is a MOSFET with Continous Drain Current 51 to 73 A, Drain Source Resistance 40 to 65 milli-ohm, Drain Source Breakdown Voltage 1200 V, Gate Source Voltage -10 to 22 V, Gate Source Threshold Voltage 1.9 to 3.5 V. Tags: Through Hole. More details for B2M040120Z can be seen below.