The 2SJ621 from Renesas is a MOSFET with Continous Drain Current 3.5 A, Drain Source Resistance 35 to 105 milliohm, Drain Source Breakdown Voltage -12 V, Gate Source Voltage 8 V, Gate Charge 6.2 nC. Tags: Through Hole. More details for 2SJ621 can be seen below.