The TSM4NB65CP from Taiwan Semiconductor is a MOSFET with Continous Drain Current 4 A, Drain Source Resistance 2700 to 3370 milliohm, Drain Source Breakdown Voltage 650 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2.5 to 4.5 V. Tags: Surface Mount. More details for TSM4NB65CP can be seen below.