The TSM3N90CI from Taiwan Semiconductor is a MOSFET with Continous Drain Current 2.5 A, Drain Source Resistance 4300 to 5100 milliohm, Drain Source Breakdown Voltage 900 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Through Hole. More details for TSM3N90CI can be seen below.