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I attached a 0.1 uF capacitor at the input of a 5 V voltage regulator. It was rated 50 V and my input was 37 V.

After some time the capacitor burned out. I tried the same with another capacitor but it did the same. What could be the reason and how to solve it?

winny
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kam1212
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  • Please provide a data sheet link for the capacitor. – Andy aka May 04 '23 at 13:21
  • Buy name brand capacitors from reputable sellers. Ali, Amazon and ebay isn't one. – winny May 04 '23 at 13:32
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    What's the type of capacitor? Ceramic, tantalum electrolitic etc? If it's polarised and fitted backwards that would also be a cause of it failing. Either that or you have a bunch of fake capacitors. – Puffafish May 04 '23 at 13:34
  • Maybe you broke the capacitors by attaching it incorrectly? Heating too much while soldering, bending leads too forcibly or applying too much pressure to capacitor can degrade a capacitor. How did you attach it? – Justme May 04 '23 at 14:31
  • Was the input DC or did it have some ripple? – Voltage Spike May 04 '23 at 14:32
  • Its input was DC and it was given to an electrolytic capacitor – kam1212 May 04 '23 at 15:51

1 Answers1

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You got fake capacitors most likely. The 50V rating on them is imaginary. Unfortunately, that's all too common. I got a whole "noname" capacitor kit, nicely packaged, that was supposed to be 50V rated. The capacitors look like they have a 16V rating and start failing a bit above 20V :( It's still useful, just not at 50V.

Kuba hasn't forgotten Monica
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