I have a question regarding input protection of a circuit. I have been looking all over the internet for awnsers, but can't seem to synthesize the right solution for my problem. To make my question as clear as possible I simplefied my circuit to the following:
I am building a modular system that uses a jack connection to pass through a voltage signal. This signal will pass through the middle of the jack plug (A_1). The sense pin leading to S_1 will detect whether the jack is fully inserted. The voltage singal being send through is the voltage over a potentiometer.
Now there are two thing I want to protect the analog signal (A_1) and sense signal (S_1) against. This being ESD (Electrostatic discharge), and a constant too high voltage. My system operates within a voltage range of 0 to 5V. The solution for ESD seems rather obvious, I want to use a LittelFuse TVS diode for that. But there is a possiblitity of a wrong jack connector being inserted and a constant 12V signal passing into my circuit. From research I found out that this TVS diode won't be able to handle this constant higher voltage and I need additional protection. I thought about using a TVS diode and Zener diode in parralel but according to the internet this was not ideal either, since my capacitance will increase and I could have more current leakage.
So I was wondering if any of you guys had a solution or case related to this problem, that can send me in the right direction. Hopefully I explained my question clearly, if not, make sure to shoot me a message.
Thanks in advance.
Edit: since it was unclear how the remainder of the circuit looked I wanted to elaborate a bit futher.
I want to have 32 of these jack connections on my controller (it will become a modular midi controller) The 2 signals lead to two 4051BE multiplexers, from these multiplexers signals lead back to the ATmega32U4 where I read the voltage over the modular parts inserted (A_1) and I read whether jack plugs have been fully inserted (S_1). The modular parts that will be inserted on the midi controller will contain potentiometers. I want to add protection near every of the 32 inputs on my modular midi controller since it is prone to wrong inserts or external disruptions in usage. Hopefully this makes my problem a bit more clear.