The STD44N4LF6 from STMicroelectronics is a MOSFET with Continous Drain Current 44 A, Drain Source Resistance 8.9 to 18 Milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for STD44N4LF6 can be seen below.