The JSM4803A from JSMicro Semiconductor is a MOSFET with Continous Drain Current -5.1 A, Drain Source Resistance 43 to 90 milli-ohm, Drain Source Breakdown Voltage -30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -1.0 to -3.0 V. Tags: Surface Mount. More details for JSM4803A can be seen below.