Hi alvadep,
Thank you, you are absolutely right! I have just tested channel C and have overseen that not both diodes are ESD. The dealer didn’t mention that and I read actually only page 1 of the data sheet 
Your warning must be repeated: with my diode there is no more ESD for one of the digital channels!
What do you think about this one?
(TVS-Diode array WE-TVS 2-Ch+VDD 3,3 V )
docs-europe.electrocomponents.co … 07e9ea.pdf
(Has to be mounted rotated by 90°)
Can you explain: Why have most of the ESD diodes an input capacitance of 100 pF and others (like the diode in my first try) just 1 pf?
Frank