The BUK7M21-40E from Nexperia is a MOSFET with Continous Drain Current 23.1 to 33 A, Drain Source Resistance 17 to 41 milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 4.5 V. Tags: Surface Mount. More details for BUK7M21-40E can be seen below.