The S4003 from ROHM Semiconductor is a MOSFET with Continous Drain Current 118 A, Drain Source Resistance 17 to 22.4 Milliohm, Drain Source Breakdown Voltage 650 V, Gate Source Voltage -4 to 22 V, Gate Source Threshold Voltage 2.7 to 5.6 V. Tags: Die. More details for S4003 can be seen below.