The BSS138BKAHZG from ROHM Semiconductor is a MOSFET with Continous Drain Current -0.4 to 0.4 A, Drain Source Resistance 490 to 4000 milliohm, Drain Source Breakdown Voltage 60 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 0.8 to 2 V. Tags: Surface Mount. More details for BSS138BKAHZG can be seen below.