The SMF178 from Solitron Devices is a MOSFET with Continous Drain Current 23 A, Drain Source Resistance 240 to 260 milli-ohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 3 to 5 V. Tags: Through Hole. More details for SMF178 can be seen below.