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We are a design using 3 decoupling capacitors the value are 47 uF 16 V X5R, but we are having trouble with the supplier.

I have an idea to replace them with 1 capacitor 100 uF, 1 10 uF and 0.1 uF. This value is common to find them. Anyone has a better value to be replaced this 3 decoupling caps?

Thanks

Michel Keijzers
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BarqLar
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    Replace it with the same value (or nearby value) and or different dielectric, max voltage rating. Try to use the same 3 caps, or something like this will occur https://i.stack.imgur.com/DHSyV.png you can see the 3 different caps ( the solid line with 3 anti resonance peaks) is mostly worse than the dotted (3 same value caps line). If no-one answers this by tonight I will write better answer. For now: https://electronics.stackexchange.com/questions/320363/antiresonance-of-multiple-parallel-decoupling-capacitors-use-same-value-or-mult – Remco Vink Dec 10 '18 at 16:15

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Using different value capacitors filters different frequencies. So using different values for decoupling generally better. Basicly, bigger capacitors filters low frequencies, smaller capacitors filters high frequencies. Your values looks OK. I think there is no problem, but to be sure i need to see schematic.

Koray
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