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SN74AUP1T97: Possible ESD issues?

Adijan Muric
Prodigy 50 points

Part Number: SN74AUP1T97
Other Parts Discussed in Thread: TPD4E1B06

Hello!

I am using the SN74AUP1T97 level translator in a non-inverting buffer configuration for translating different logic levels for TTL UART communication. I was wondering if TPD4E1B06DRLR diodes are appropriate for protecting the communication lines of the level translator. The reason I am asking this is that we already have a product prototype, and the only thing that fails is the voltage translator. After replacing it with a new one, it works for some time before failing again. Another thing I should mention is that the voltage translator takes its input off board and the input is often physically connected and disconnected. We suspect possible ESD problems. Is my line of reasoning correct, or should I look elsewhere for other possible issues?

Thank you for your time!

  • +1
    Guru 327040 points

    Yes; ESD or arcing from the (un)plugging is the most likely reason for damage. In general, logic devices have ESD protection that is designed only for automatic assembly.

    Put a protection component (like the TPD4E1B06) near the connector, and ensure that there is a decoupling capacitor nearby. An additional series resistor limits the remaining current that must be handled by the SN74AUP1T97's input protection.