The HP8M51 from ROHM Semiconductor is a MOSFET with Continous Drain Current -4.5 to 4.5 A, Drain Source Resistance 120 to 320 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 HP8M51 can be seen below.