The FQB19N20L from onsemi is a MOSFET with Continous Drain Current 21 A, Drain Source Resistance 110 to 150 milliohm, Drain Source Breakdown Voltage 200 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2 V. Tags: Surface Mount. More details for FQB19N20L can be seen below.