The BUK9K45-100E from Nexperia is a MOSFET with Continous Drain Current 15 to 21 A, Drain Source Resistance 35.3 to 124 milliohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage -15 to 15 V, Gate Source Threshold Voltage 0.5 to 2.45 V. Tags: Surface Mount. More details for BUK9K45-100E can be seen below.