The TSM4N90CZ from Taiwan Semiconductor is a MOSFET with Continous Drain Current 4 A, Drain Source Resistance 3200 to 4000 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 TSM4N90CZ can be seen below.