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TCAN1042-Q1: Absolute Max Ratings of 58 V at CANH/L

Part Number: TCAN1042-Q1
Other Parts Discussed in Thread: SN65HVDA1040A-Q1,

Hello,

TCAN1042-Q1's absolute Max ratings at CANH/CANL are defined as ±58 V, which I guess are higher than the other CAN transceivers such as SN65HVDA1040A-Q1. I'd like to know about the background of this spec definition - market trend, standards, and so forth. What were the absolute Max specs aimed at?

Best regards,
Shinichi Yokota

  • Yokota-san,

    This has become a standard for most (if not all) CAN transceiver products in the market, and has minimized the amount of external protection components needed. The other reason is the case where a load dump occurs in a 24V system and the CAN bus is shorted to the battery. There are also ±70V versions of the TCAN1042, and this is just to further the amount of integrated protection.

    Is there a customer inquiry about this? Or just curiosity on your part?

    Regards,
  • Eric-san,

    What's the name of the standard? I'm interested in only ±58-V tolerance (not 70 V) and wonder where the number 58 V came from. If the ±58 V has become a standard, then can SN65HVDA1040A-Q1 still be used in the market?

    Best regards,
    Shinichi Yokota

  • Yokota-san,

    My mistake for the confusion, it is not part of a standard, it has become what most CAN transceivers on the market must be specified to in order to compete. There's no official body that made this a requirement for CAN transceivers.

    Regards,

  • Eric-san,

    This might be the last question. Does the ±58-V bus tolerance have something to do with the ISO 11898 standard?

    Best regards,
    Shinichi Yokota

  • Yokota-san,

    It is mentioned in the ISO11898-2:2016 standard as an optional extended maximum rating range, but the required parameter is -27V to +40V for the VCANH and VCANL. The ±70V extended range is not listed in the standard though.

    Regards,