The FK4B01120L from Nuvoton Technology is a MOSFET with Continous Drain Current 3.9 to 7.9 A, Drain Source Resistance 14 to 62 milli-ohm, Drain Source Breakdown Voltage 12 V, Gate Source Voltage -8 to 8 V, Gate Source Threshold Voltage 0.3 to 1.0 V. Tags: Chip. More details for FK4B01120L can be seen below.