The BUK9Y27-40B from Nexperia is a MOSFET with Continous Drain Current 24 to 34 A, Drain Source Resistance 18 to 57 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 BUK9Y27-40B can be seen below.