The BS250CSM4 from TT Electronics is a Space Qualified MOSFETs with Continous Drain Current 0.095 to 0.15 A, Drain Source Resistance 14 to 28 Ohms, Drain Source Breakdown Voltage 45 to 60 V, Gate Source Voltage ±30 V, Gate Source Threshold Voltage 1 to 3.5 V. Tags: Surface Mount. More details for BS250CSM4 can be seen below.