What is the difference between active and passive heat sinks?

Whether you’re designing computers, LED lighting, or other electronics, you need to think about heat sinks. Heat sinks absorb and dissipate the heat from these devices, helping to keep them cool.
Today we’ll talk about some different types of heat sinks, how they’re made, and their applications.

Generally, heat sinks are grouped by the manufacturing process used to create them, i.e. extruded, machined, etc.It’s important to understand that all heat sinks fall into two categories.
The Two Major Heat Sink Categories
All heat sinks can be broken down into two major categories… active and passive. What is the difference between active and passive heat sinks?

Active Heat Sinks
These generally have a fan or blower of some kind. The most common type is a ball bearing motor fan. These provide excellent performance, but they consist of moving parts and are on the expensive side.
Passive Heat Sinks

These have no mechanical components. They only use the convection process to dissipate thermal energy. Because they have no moving parts, they are more reliable. But they should still have continuous air flow across their fins.

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