The DMN4040SK3 from Diodes Incorporated is a MOSFET with Continous Drain Current 9.3 A, Drain Source Resistance 20 to 54 milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.8 to 3 V. Tags: Surface Mount. More details for DMN4040SK3 can be seen below.