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TPD4S012: interface

Part Number: TPD4S012
Other Parts Discussed in Thread: TPD6E001

Hi


I am very curious about : Difference of TPD4S012 and TPD6E001

1. TPD9E001                                                                             2. TPDS4012

Above the picture first one is TPD9E001, and the second one is TPDS4012

TPD4S012 has zener diode for VBUS.

But TPD6E001 doesn't have zener diode for VBUS.

Why the TPD6E001 is not use zener and TPD4S012 use the zener? 

If I can use this part replace?

Thanks