Help choosing a capacitory for 3.3v circuite

[sairfan1]

I was looking for SMD 0805 10uF capacitor for my 3.3v circuite, when I searched mostly capacitors I found were 10uF 50v I want to know does it still work or its big difference I believe closest I can found could be 6.3v. I wanted to learn how capacitor voltage can impect when supply voltage is way below.

I will be using those capacitors close to VDD/VCC line of different ICs.

[Kleinstein]

The voltage rating for capacitors is the maximum allowed voltage. Using a capacitor with a higher voltage rating is no electrical problem. The higher voltage ones tend to be more expensive and mechnical larger though, but there is also a question what is available and used in numbers.
10 µF is already quite a large capacitor for decoupling, depending on the chip (especially logic, OPs, low power µCs) less capacitance may be enough.

[Zero999]

What sort of capacitor is it: ceramic, tantalum, aluminium?

Most large value ceramic capacitors, in a small package, saturate at a relatively low voltage, compared to their ratings. This means that the capacitance drops, as the voltage increases. A 50V 10µF ceramic capacitor will not have a capacitance anywhere near 10µF at 50V, or even 30V, but at 3.3V, it'll definitely be 10µF. In other words, if it's ceramic, then I would definitely recommend using a 50V ceramic capacitor on a 3.3V rail.

If it's an aluminium electrolytic capacitor, then this isn't an issue, but a 50V part on a 3.3V rail wouldn't be a problem.

Tantalum capacitors have a tendency to smoke when used close to their voltage ratings, especially when subject to high current surges/ripple. Going for 50V is still overkill, but won't do any harm.

[alligatorblues]

My rule for tqntalum is double the voltage you need.

[Vovk_Z]

I wanted to learn how capacitor voltage can impect when supply voltage is way below.

There are several topics about it here.

[sairfan1]

its ceramic capacitor, thanks for the explaination.