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Aluminum/MCPCB suppliers?
487 1 Jan 09.2020, 17:38:16

Hey guys,
Anyone have personal experience with any MCPCB suppliers? I'm designing a board that really needs good thermal conductivity. I still have to do some thermal measurements, I ordered the last board but seemed to not /really/ be a proper, thermally conductive MCPCB. As far as I can tell, it's a thin layer of FR4 glued to an aluminum baseplate (if this is actually how some of the thermally conductive baseboards are, I'd like to know--I'd assumed it'd be something white and without fiberglass reinforcement, being ceramic filled). This particular supplier couldn't provide data on what baseboard material they even used or where it came from.
Thanks!

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A****min

Jan 15.2020, 10:25:12

If the supplier can't supply you with any definitive heat dissipating specifications, then you cannot rely on it.
Other options for better heat dissipation are:
1/ Specify 3oz copper instead of the usual 1oz;
2/ Open up the bottom layer tracks/bottom layer heat sink areas so that they are covered with solder during wave soldering;
3/ Open up the top layer solder mask & paste screen for tracks & heat sink areas so that these areas will be filled with solder paste. This will increase significantly the heat dissipation. Specify a 8 thou paste screen & if your board areas are quite large, consider a "grid arrangement" within the screen to prevent large bubbles forming during the infrared reflow process.

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