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Topic starter
2025-12-10 10:27 am
Hi everyone,
I’m building a small power-supply board for a project, and I’m thinking of using the EEFSX0D471E4 capacitor on the output rail. It’s a polymer aluminum electrolytic cap rated at 470 µF, 2.0 V, with a very low ESR (~4.5 mΩ) and high ripple-current capability (up to 8.5 A rms).
Because of those specs, low ESR, high ripple tolerance, and small SMD package, it seems like a good candidate for decoupling or smoothing near regulators or sensitive circuits, especially in compact builds.
What I hope to achieve: stable output voltage without large electrolytic cans, reduced noise, and good filtering from both steady DC and transient loads (like digital modules or switching regulators).
Before I commit, I’d appreciate thoughts from anyone who has used similar capacitors, especially in DIY or small-scale power supplies:
Does using a polymer SMD cap like this usually give noticeably cleaner output vs standard electrolytics? Is it a good idea to combine it with a small ceramic bypass cap (for high-frequency noise)? Any special PCB layout or grounding practices when using low-ESR SMD polymer caps to avoid noise or instability?
Thanks
2025-12-11 1:25 am
I not very knowledgeable when it comes to capacitors in general. When i worked as an engineer we did use electrolytic caps in the products we were designing and did not have a problem except sometimes trying to source them. They do age out (dry out) eventually.
From my searching on the web it looks like the poly caps are superior but more expensive. I don't know if you can get them in the sizes that electrolytics run but you posted they had the values you needed.
As far a using the smaller filter caps we never placed those near the power storing caps, we placed them as close as possible to the components that may have some switching noise associated with them.