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TPD1E05U06: polarity, clamp, short

Part Number: TPD1E05U06


Does TPD1E05U06 has polarity?

Customer used this part but some of the circuit level was clamped to 0.8V(0V - 0.8V logic level). When remove diode on this line, line was normal up to 3.3V level.(0 - 3.3V level)

I wonder if it has polarity, like pine 1 should connect to signal and 2 should be gnd, or, etc....

And how can I test if it is right or not.