The SH8J31 from ROHM Semiconductor is a MOSFET with Continous Drain Current -4.5 to 4.5 A, Drain Source Resistance 50 to 85 milliohm, Drain Source Breakdown Voltage -60 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -3 to 1 V. Tags: Surface Mount. More details for SH8J31 can be seen below.