The G20N03K from Goford Semiconductor is a MOSFET with Continous Drain Current 30 A, Drain Source Resistance 12 to 24 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for G20N03K can be seen below.