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Old 4th August 2012, 04:33 PM   #11
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Quote:
Originally Posted by fpitas View Post
It's a lot tougher to get surface mount devices hooked to a heat sink.
Usually surface mount devices that require a sink come with exposed metal pads to facilitate the easy coupling of a heatsink too them. Having said that, most SMD devices that need heatsinking generally only require a specific exposed tab/pin to be soldered to the PCB, so that a copper plane can dissipate the heat.

Then, for really high power stuff you use normal through hole parts as the devices need to be large enough anyway, to be capable of transferring the heat the produce to somewhere else.
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Old 4th August 2012, 04:41 PM   #12
fpitas is offline fpitas  United States
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Quote:
Originally Posted by 5th element View Post
Usually surface mount devices that require a sink come with exposed metal pads to facilitate the easy coupling of a heatsink too them. Having said that, most SMD devices that need heatsinking generally only require a specific exposed tab/pin to be soldered to the PCB, so that a copper plane can dissipate the heat.

Then, for really high power stuff you use normal through hole parts as the devices need to be large enough anyway, to be capable of transferring the heat the produce to somewhere else.
I design RF power amps for a living, so I heatsink SMD transistors all the time by designing a hole in the PCB, and clamping the device or using its flanges. Through hole really isn't an option because of package parasitics.
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Old 4th August 2012, 04:55 PM   #13
marce is offline marce  United Kingdom
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6 layer board, 4oz copper each layer, devices clamped to the case via the PCB, or use active heatsinking with heat pipes. And a thermal camera helps so you can sea the thermal profile of the system easily.
Regarding older devices, I think the area of silicon used for some older devices was bigger than used today, with shrinking SMD devices and the same capacity in smaller more modern packaging, more devices per wafer= more profit.

Last edited by marce; 4th August 2012 at 04:57 PM.
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