The STS5N15F4 from STMicroelectronics is a MOSFET with Continous Drain Current 5 A, Drain Source Resistance 57 to 63 Milliohm, Drain Source Breakdown Voltage 150 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for STS5N15F4 can be seen below.