The 45P40 from Goford Semiconductor is a MOSFET with Continous Drain Current -45 A, Drain Source Resistance 10.5 to 14 milliohm, Drain Source Breakdown Voltage -40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -2.5 to -1.2 V. Tags: Surface Mount. More details for 45P40 can be seen below.