Hi,
ADC inputs are protected as other IOs (i.e. 5V tolerant if VDD and VDDA are present). Exception is ANA0 and ANA1 which are 'only' tolerant to 3.9V.
ESD is same for all, and specified in datasheet.
Protection are usually not present on ADC as analog inputs does not go directly outside of the PCB (there is always some circuitry) and so, are not prone to strong ESD stress.
Nevertheless, it depend on your application and system circuitry.
Regards.
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