The BUK9K25-40E from Nexperia is a MOSFET with Continous Drain Current 16.6 to 18.2 A, Drain Source Resistance 19 to 58 milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -15 to 15 V, Gate Source Threshold Voltage 0.5 to 2.45 V. Tags: Surface Mount. More details for BUK9K25-40E can be seen below.