Hello!

An ECU uses some PIC analog pins to connect to external sensors
that return 0 .. 3.3V analog signal, like e.g. a TPS.

0603 10uF 6.3V capacitor in parallel to the PIC input, to smooth
things out.

Now I wonder if a zener is necessary too, to protect from ESD.

OK, they won't harm. But are they really necessary in your opinion?

PCB's are already made and space is little, more hand work is non
desiderable etc.. so if they are really useful OK, else why add them..

Thanks,
Mario

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