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TCAN1042HG-Q1: Internal TVS/ESD structure

Li Zhao
Prodigy 20 points

Part Number: TCAN1042HG-Q1

Hello TI Engineer,
 
The TCAN1042HGDRQ1 supports ±70V CAN bus fault protection. I have a few questions regarding this feature:
 
  1. How is this ±70V protection achieved internally?
  2. Does the device integrate an internal TVS or ESD structure on the CAN bus pins? If yes, could you please describe it (e.g., type, typical Vbr/Vcl)?
  3. What are the key differences between the ±70V “H” version and the ±58V standard version of TCAN1042?
  4. How much credibility and margin can be attributed to this ±70V rating? Is it a tested, absolute maximum, or typical value?
 
Thank you.
  • 0
    TI__Guru 72522 points

    Hi Li,

    1. By design I.e., high-voltage tolerant FET structures, current-limiting circuitry, clamp networks, ESD cells etc.

    2. No internal TVS. SCR ESD structures are typical for all devices. Note that these internal structures are not equivalent to external TVS diodes and we do not specify Vbr / Vcl. Hence, external TVS diodes are still recommended and suggest referring to the TVS diode's data sheet instead.

    3. This is by design. They are designed differently similar to 1. Hence, the abs max rating as the main difference in spec, then lower / cheaper price.

    4. This is not a typical estimate. It is an absolute maximum rating guaranteed by qualification, characterized across temp. Hence, we cannot guarantee above the abs max rating, thanks.

    Best Regards,

    Michael.