I was looking for a heat sink in a long list of products. In heat-sink datasheets, I usually see terms like anodized, no finish or degreased finish. What do these terms mean? What information they give about the heat-sink. Do they give information about surface insulation of the heat-sink?
Answer
It is literally how the heat sink material is finished after fabrication. Using your examples:
- Anodizing a conductive heatsink makes it nonconductive. Use this if you want the part's case voltage isolated from the heatsink.
- No finish would be raw material. If the heatsink is aluminum, it will come with no paint, completely bare aluminum.
- If you intend to use a thermal paste between the part and the heatsink, a degreased finish, free from machine oil, would be a good starting point.
This is an area where you really need to consider your application, and what you need from the heatsink.
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