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Original question:

TCAN1043H-Q1: When the CANH or CANL short to the 48V battery Voltage, How to design with TCAN1043H-Q1?

TCAN1043N-Q1: TCAN1043A/N-Q1 vs TCAN1043-Q1: VSUP Rating and Load Dump

Alessandro Sanna
Prodigy 30 points
Part Number: TCAN1043N-Q1
Other Parts Discussed in Thread: TCAN1043, TCAN1043-Q1, , TCAN1043A-Q1

Hello,

We are evaluating the following components for a new Automotive ECU, ASIL C, 24 V system, with a load dump requirement of 58 V:

  • TCAN1043A/N‑Q1

  • TCAN1043‑Q1

  • TCAN1043H‑Q1

We have observed the following:

  • The TCAN1043N‑Q1 has a VSUP and load dump maximum rating of 45 V, which does not align with the CANH/L fault tolerance of ±58 V.

  • The TCAN1043‑Q1 has a VSUP rating of 58 V, but the datasheet does not explicitly specify load dump capability. We have also seen recommendations to transition to the newer TCAN1043A/N‑Q1.

  • The TCAN1043H‑Q1 appears to be the only variant that meets our requirements.

Could you please confirm:

  1. Is the TCAN1043H‑Q1 indeed the appropriate choice for a 24 V system with a 58 V load dump?

  2. Is it correct that the TCAN1043A/N‑Q1 cannot withstand a 58 V load dump?

Thank you very much for your support.

Best regards,

  • 0
    TI__Mastermind 30620 points

    Hi Alessandro,

    TCAN1043N-Q1 is a newer version of TCAN1043-Q1, which is SW compatible. TCAN1043A-Q1 has slightly different with those two devices. I would recommend to use TCAN1043N-Q1 or TCAN1043A-Q1 depending on your SW requirement, as those devices use newer technology to reduce the cost, but have a lower abs max rating.

    TCAN1043N & TCAN1043A can still be used in a 24V system, by adding a voltage divider to step down the input voltage.

    TCAN1043/TCAN1043H can withstand 58V load dump without the need of voltage divider.

    Regards,

    Sean