Question about voltage rating on CSYNC caps

[Xaranar]

I was just wondering, what voltage rating should be used on the 220uf cap on the csync line on a Mega Drive? The reason I ask is, Rob from retro gaming cables uses 6.3v, but Bob from retrorgb says either 10 or 16v. If Voultar’s video about it is correct, then 6.3v should be all that’s needed, considering the 470R resistor attenuates the 5v TTL sync to around 500mv. What do you guys think?

[ASDR]

Where on RetroRGB does he say 10/16v? Since both TTL and video level sync signals are below 6.3v, that should be fine?

[Xaranar]

Right here:

http://retrorgb.com/csync.html

Look at the Sega Genesis section.

[ASDR]

Sorry, was looking at the Genesis page. For the MD1 he says 'Either way, the voltage shouldn't be below 10v and I prefer 16v to be safe'. Hm, https://www.sparkfun.com/news/1271. Capacitors are weird, there are so many different types, each with their own quirks, failure modes & non-linearities.

[Xaranar]

Interesting. Even if you derate for 50%, as the cap comes after the resistor in series, you're still only dealing with ~500mv, twice that would be 1v, well under the 6.3.