The G1003B from Goford Semiconductor is a MOSFET with Continous Drain Current 5 A, Drain Source Resistance 135 to 180 milliohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage -25 to 25 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Surface Mount. More details for G1003B can be seen below.