The BS870Q from Diodes Incorporated is a MOSFET with Continous Drain Current 0.25 A, Drain Source Resistance 2000 to 5000 milliohm, Drain Source Breakdown Voltage 60 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Surface Mount. More details for BS870Q can be seen below.