The MSJB17N80 from Micro Commercial Components is a MOSFET with Continous Drain Current 17 A, Drain Source Resistance 250 to 290 milliohm, Drain Source Breakdown Voltage 800 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for MSJB17N80 can be seen below.