The FC4B21280L from Panasonic Corporation is a MOSFET with Drain Source Resistance 12 to 45 milliohm, Drain Source Breakdown Voltage 12 V, Gate Source Voltage 8 V, Gate Source Threshold Voltage 0.35 to 1.4 V, Gate Charge 6.2 nC. Tags: Chip. More details for FC4B21280L can be seen below.