The BSS123 from PANJIT Semiconductor is a MOSFET with Continous Drain Current 0.17 A, Drain Source Resistance 4000 to 10000 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 BSS123 can be seen below.