The RS1G300GN from ROHM Semiconductor is a MOSFET with Continous Drain Current -80 to 80 A, Drain Source Resistance 1.9 to 3 Milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for RS1G300GN can be seen below.