The TSM4NC50CP from Taiwan Semiconductor is a MOSFET with Continous Drain Current 4 A, Drain Source Resistance 2400 to 2700 milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 3 V. Tags: Surface Mount. More details for TSM4NC50CP can be seen below.