The BUK9D23-40E from Nexperia is a MOSFET with Continous Drain Current 12 to 19 A, Drain Source Resistance 18 to 43 milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -15 to 15 V, Gate Source Threshold Voltage 1.4 to 2.1 V. Tags: Surface Mount. More details for BUK9D23-40E can be seen below.