The STP185N55F3 from STMicroelectronics is a MOSFET with Continous Drain Current 120 A, Drain Source Resistance 2.9 to 3.8 Milliohm, Drain Source Breakdown Voltage 55 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Through Hole. More details for STP185N55F3 can be seen below.