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ESD204: ESD204

Buck Patel
Prodigy 60 points
Part Number: ESD204
Other Parts Discussed in Thread: SN74AVC4T245, STRIKE

Tool/software:

I am working on a Space Product that needs ESD protection of the Giga bit Ethernet lines and a 3.3V UART port. The part must meet MIL-STD-461G Personnel Borne Electrostatic Discharge (level 1). Can you suggest any TI parts? Note level 1 is only +-2kV air discharge. Do you have ESD parts that meet NASA requirements for outgassing too? This is a question that is wider than the use of the ESD204. Suggest power supply lines for ESD protection too? Vin typ. is 28V with a max of 50V. Suggest 3.3V JTAG signals.  Does TI have a space grade buffer that takes a 2.5V I/O signal from a FPGA UART and converts it to 3.3V? something like a SN74AVC4T245.

Why does app notes say "Bidirectional ESD protection has to be applied to interfaces that operate with positive and negative voltage ranges". Say I have a 3.3V UART port, so the signal will only be from 0V to 3.3V. But an ESD event could be +2kV or -2kV. Would I not need a Bidirectional ESD?     

  • 0
    TI__Mastermind 18340 points

    Hi Buck,

    We have plenty of options that can meet 2kV IEC ESD requirements like ESD204. I'm not familiar with NASA requirements, but we don't have any military/space grade devices in our portfolio. IfDoes your application require a standard rating for space/military grade applications?

    Can you please make a seperate post for the SN74AVC device, I don't support those ICs. 

    ESD diodes can clamp negative ESD strikes regardless of their polarity.

    Bidirectional diodes just have a symmetrical breakdown in both polarities, but an ESD strike of -2kV would be well above the -Vbr of a unidirectional/bidirectional diode. Unidirectional diodes will have a lower clamping voltage for negative ESD strikes due to the lower breakdown voltage. 

    Regards,

    Sebastian