The IPD40N03S4L-08 from Infineon Technologies is a MOSFET with Continous Drain Current 38 to 40 A, Drain Source Resistance 7.2 to 13 Mohms, Drain Source Breakdown Voltage 30 V, Gate Source Voltage 16 V, Gate Source Threshold Voltage 1 to 2.2 V. Tags: Surface Mount. More details for IPD40N03S4L-08 can be seen below.