The IRF9389TRPb from Infineon Technologies is a MOSFET with Continous Drain Current -4.6 to 6.8 A, Drain Source Resistance 22 to 103 milliohm, Drain Source Breakdown Voltage -30 to 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -2.3 to 2.3 V. Tags: Surface Mount. More details for IRF9389TRPb can be seen below.