The IPG20N04S4-09 from Infineon Technologies is a MOSFET with Continous Drain Current 20 A, Drain Source Resistance 7.9 to 8.6 Mohms, Drain Source Breakdown Voltage 40 V, Gate Source Voltage 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for IPG20N04S4-09 can be seen below.