I'm currently building a LPF using a differential op-amp configuration and a multiple feedback topology. The opamp I'm using is the THS4131. I supply the opamp with a +/-12V power supply. My question is what capacitor voltage rating should I use? I know for a decoupling capacitor where there is a ground, that anything above 12V + some fudge factor should be enough. However, I'm using differential mode so there's a common mode ground which I'm not too sure about. Furthermore, the capacitor is used for the topology and not for decoupling.
I've tried using a 16V rating cap and I'm unsure whether this is too low. I've already built the circuit and the opamp is heating up when powered. I'm checked the traces and wiring so it seems fine so I'm thinking it's due to this voltage rating.
So my question is what voltage rating should I be using?
edit: Schematic added