The 2SK2943 from Sanken Electric is a MOSFET with Continous Drain Current -3 to 3 A, Drain Source Resistance 4 to 5 Ohm, Drain Source Breakdown Voltage 900 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Through Hole. More details for 2SK2943 can be seen below.