The BUK6D120-40E from Nexperia is a MOSFET with Continous Drain Current 3.6 to 5.7 A, Drain Source Resistance 85 to 233 milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for BUK6D120-40E can be seen below.