The BUK9K25-40RA 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 10 V, Gate Source Threshold Voltage 0.5 to 2.45 V. Tags: Surface Mount. More details for BUK9K25-40RA can be seen below.