The BUK4D16-20 from Nexperia is a MOSFET with Continous Drain Current 17 to 26 A, Drain Source Resistance 11 to 25 milliohm, Drain Source Breakdown Voltage 20 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage 0.6 to 1.3 V. Tags: Surface Mount. More details for BUK4D16-20 can be seen below.