That is correct, the ADM232A would need external protection, whereas the ADM202E does not need any external protection to meet Level 4 IEC-61000-4-2 protection.
For adding IEC61000-4-2 protection to the ADM232A, something like the SM-15 series…
I would like to know ADM232A (RS232 Line Driver/Receiver) Cin and Cpd.
There seems no specification on the datasheet.
I appreciate if you share this C-in and Cpd value of ADM232A or guide to how to calculate these values.
Thank you for your…