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Old 7th January 2005, 05:40 PM   #1
Lico is offline Lico  United States
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Default diode sinking

Hi, I have some MUR860 diodes for a 3886 gc, do I need heatsinks for them or will current be low enough that they can live without them?
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Old 7th January 2005, 06:04 PM   #2
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I have no technical information other than my experience. They don't even get warm with a 3875 driven hard. So, no.
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Old 7th January 2005, 08:09 PM   #3
wxn is offline wxn  Lithuania
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A pair of small heatsinks surely won't hurt. LM3886 has twice the current capability of LM3875
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Old 8th January 2005, 02:20 AM   #4
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Quote:
Originally posted by wxn
A pair of small heatsinks surely won't hurt. LM3886 has twice the current capability of LM3875
I think hes talking about the diodes though, which shouldnt need heatsinks..

If they do, buy some bigger diodes.
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Old 8th January 2005, 02:45 AM   #5
tiroth is offline tiroth  United States
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If the amp is drawing twice the current, the diodes will have twice the dissipation and be twice as hot! In reality, there likely won't be a large difference unless you are pushing the amp and using all that extra current capability, but the point is quite valid.
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Old 8th January 2005, 11:48 PM   #6
cpemma is offline cpemma  United Kingdom
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They're in a TO220 case, typical thermal resistance (bare tab) 60C/W. Averaging 2A (which is a lot when you consider they're only conducting half the time) they'd waste 2W and get damned hot but survive.

So do the maths for your amp.
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Old 10th January 2005, 04:06 AM   #7
Lico is offline Lico  United States
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thanks guys
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