The P40F12SN from Shindengen America is a MOSFET with Continous Drain Current 40 A, Drain Source Resistance 9.5 to 11.9 milliohm, Drain Source Breakdown Voltage 120 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Through Hole. More details for P40F12SN can be seen below.