The BUK6D30-40E from Nexperia is a MOSFET with Continous Drain Current 12.8 to 18 A, Drain Source Resistance 23 to 40 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 BUK6D30-40E can be seen below.