ssf4n60.pdf datasheet:

SSF4N60 Features Vdss = 600V Extremely high dv/dt capability Id = 4A Low Gate Charge Qg results in Simple Drive Requirement Rdson = 2.3 (typ.) 100% avalanche tested Gate charge minimized Very low intrinsic capacitances Very good manufacturing repeatability Description The SSF4N60 is a new generation of high voltage NChannel enhancement mode power MOSFETs and is obtained through an extreme optimization layout design, in additional to pushing on-resistance significantly down, special care is taken to ensure a very good dv/dt capability, provide superior switching performance, withstand high energy pulse in the avalanche, and increases packing density. Application SSF4N60 TOP View (TO220) High current, high speed switching Lighting Ideal for off-line power supply, adaptor, PFC Absolute Maximum Rating