The BST500D08P4A104 from ROHM Semiconductor is a MOSFET with Continous Drain Current 506 A, Drain Source Resistance 2 to 4 milli-ohm, Drain Source Breakdown Voltage 750 V, Gate Source Voltage -4 to 21 V, Gate Source Threshold Voltage 2.8 to 4.8 V. Tags: Surface Mount. More details for BST500D08P4A104 can be seen below.