The BUK9Y19-55B from Nexperia is a MOSFET with Continous Drain Current 32 to 46 A, Drain Source Resistance 14.3 to 40 milliohm, Drain Source Breakdown Voltage 55 V, Gate Source Voltage -15 to 15 V, Gate Source Threshold Voltage 0.5 to 2.3 V. Tags: Surface Mount. More details for BUK9Y19-55B can be seen below.