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by michaelt
1690 days ago
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> Nobody's come up with a circuit board material that's electrically insulating but thermally conductive so we could sink an appreciable amount of heat out of the back side? In applications like high-power LED lights, you'll often get 'Insulated Metal Substrate' PCBs where the printed circuit is on an aluminium or copper board, separated by a very thin electrically insulating layer. [1] However, this has a few downsides: The electrically insulating layers aren't perfectly thermally conductive, meaning a directly attached heatsink will usually perform better; if you make a complex board with 8+ layers of copper (like a modern motherboard) you end up with 8+ layers of insulation; and it's nigh-impossible to use through-hole components. For LED lighting those are non-issues and, a top-mounted heatsink wasn't an option anyway. [1] https://dm.henkel-dam.com/is/content/henkel/Bergquist%20Comp... |
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