The JSM3420 from JSMicro Semiconductor is a MOSFET with Continous Drain Current 6.0 A, Drain Source Resistance 0.016 to 0.035 ohm, Drain Source Breakdown Voltage 20 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 0.5 to 1.0 V. Tags: Surface Mount. More details for JSM3420 can be seen below.