The BSS138W-G from Comchip Technology is a MOSFET with Continous Drain Current 0.2 A, Drain Source Resistance 1400 to 3500 milliohm, Drain Source Breakdown Voltage 50 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 0.5 to 1.5 V. Tags: Surface Mount. More details for BSS138W-G can be seen below.