The QM2421M3 from uPI Semiconductor is a MOSFET with Continous Drain Current -4.9 to -24 A, Drain Source Resistance 25 to 45 milli-ohm, Drain Source Breakdown Voltage -20 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage -0.5 to -1.2 V. Tags: Surface Mount. More details for QM2421M3 can be seen below.