The BUK9Y14-40B from Nexperia is a MOSFET with Continous Drain Current 40 to 56 A, Drain Source Resistance 9 to 26 milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -15 to 15 V, Gate Source Threshold Voltage 0.5 to 2.3 V. Tags: Surface Mount. More details for BUK9Y14-40B can be seen below.