The QS8M51 from ROHM Semiconductor is a MOSFET with Continous Drain Current -2 to 2 A, Drain Source Resistance 240 to 540 Milliohm, Drain Source Breakdown Voltage -100 to 100 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -2.5 to 2.5 V. Tags: Surface Mount. More details for QS8M51 can be seen below.