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Sourcing low esr caps
Sourcing low esr caps
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Old 4th March 2013, 10:34 PM   #1
keithsnaim149 is offline keithsnaim149  United Kingdom
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Join Date: Feb 2013
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Default Sourcing low esr caps

Does anyone know a good quality low esr cap. 4700uf 63V/6800uf 63V. Where to get them at a price that doesn't cost the earth.
Regards Keith
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Old 7th March 2013, 02:28 AM   #2
twest820 is offline twest820
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You can search for this easily in Digi-Key's part selector to see the price to ESR tradeoff and then look into what parts you might be able to source without having to have shipped across the pond.
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Old 7th March 2013, 02:56 AM   #3
gootee is offline gootee  United States
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You could use multiple smaller-value caps in parallel and make the ESR, and the ESL, as low as you want, especially if you mount them on a thin two-sided PCB (with unbroken power and ground planes).

Or, maybe two cheaper caps in parallel could have lower ESR than one expensive cap of twice the capacitance value.

Why do you need low ESR? Is it so they can handle a lot of ripple current without getting too hot? Or is it to make a PSU have low output impedance?
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