Electronic Heat SinkTypically, heat sinks designed for dissipating heat from high-power electronic components, without external power, for natural cooling. Most are made of aluminum alloy profiles, cut to the required size based on the component size, such as heat sinks for high-power switching tubes or transistors. Of course, in special cases, high-power electronic components may also come with heat fans, such as the switching tubes in switching power supplies, which must be equipped with a heat fan.