The BSS123W from Taiwan Semiconductor is a MOSFET with Continous Drain Current 0.16 A, Drain Source Resistance 3600 to 5500 milliohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for BSS123W can be seen below.