The BS170F from Diodes Incorporated is a MOSFET with Continous Drain Current 0.15 A, Drain Source Resistance 5000 milliohm, Drain Source Breakdown Voltage 60 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 0.8 to 3 V. Tags: Surface Mount. More details for BS170F can be seen below.