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ISO1500: surge and fast transient protection for the bus power rails

Keith Keller
Expert 7270 points
Part Number: ISO1500
Other Parts Discussed in Thread: ISO1410

Hello,

Does the ISO1500 have surge and fast transient protection for the bus power rails Vcc ( in addition to the bus lines A B ) ?

Is there any difference in the ISO1410?   ( Or other TI isolated RS-485? )

Thank you, Keith

  • 0
    TI__Expert 6955 points
    Keith,

    The ISO1500 is not certified for handling EFT. The ISO1410 is much more robust and is certified to handle EFT per the IEC 61000-4-4 standard. I recommend the ISO141x if you need the most protection on the bus lines.

    Respectfully,
    Lucas
  • 0 in reply to Lucas Schulte9
    TI__Expert 6955 points
    Keith,

    I have more information to address your questions in more detail.

    The ISO1500 has integrated ESD protection of 8kV (with respect to Bus side GND). The same structures are capable to handle 2kV IEC EFT.
    There is no integrated Surge protection on the bus side.

    ISO14xx has integrated ESD protection of 16kV (with respect to bus side GND). It also has separate EFT structures to handle 4kV IEC EFT and is capable of achieving Class A(no bit error during transients) EFT as long as proper layout is used. There is no integrated Surge protection on the bus side.

    The isolation barrier is able to handle Surge if the customer is confident that the Surge event will only happen common mode on bus w.r.t Protection Earth and PE is on logic side(GND1). The ISO14xx ISO barrier can handle 10kV Surge and the ISO1500 ISO barrier can handle 4kV surge(package limited).

    In both devices, the protraction structures are on the bus pins w.r.t GND2. So they divert energy to GND2.
    On Vcc1 w.r.t GND1 and Vcc2 w.r.t GNDD2- we have HBM protection for both ISO14xx and ISO1500. 6kV HBM for ISO14xx and 4kV HBM for ISO1500.

    Respectfully,
    Lucas