The BUK9Y09-40B from Nexperia is a MOSFET with Continous Drain Current 53 to 75 A, Drain Source Resistance 5.8 to 19 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 BUK9Y09-40B can be seen below.