Electronic Heat SinkTypically, these are heat sinks for high-power electronic components, operating without external power, relying on 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 cooling fans, such as the switching tubes in switching power supplies, which must be equipped with a cooling fan.