The BUK9640-100A from Nexperia is a MOSFET with Continous Drain Current 28 to 39 A, Drain Source Resistance 29 to 100 milliohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage -15 to 15 V, Gate Source Threshold Voltage 0.5 to 2.3 V. Tags: Surface Mount. More details for BUK9640-100A can be seen below.