• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 33 subscribers
  • Views 349 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TCAN1042HV: The chips doesn't stand 70V.

Maxime Gaschet
Prodigy 60 points
Part Number: TCAN1042HV


Hi there,

we're using a TCAN1042HVDRB on one of our design because we need to stand 65V on CANH/CANL.

Unfortunately, it seems that the transceiver fails at 60V.

We've bought the chips on Digikey and we're not sure that the chip is really the "H" suffix (even if the reference is good on the bag) since the marking is the same (1042V).

Could you please confirm that this transceiver can stands 65V on CANH/CANL without external component on the bus ?

Best regards,

Maxime.

  • 0
    TI__Guru 62920 points

    Hi Maxime,

    Yes, I can confirm that the TCAN1042HVDRB should withstand DC voltages up to 70 V on the CANH or CANL pins.  Can you provide us any information on how the shorting test was conducted?  If, for example, the shorting voltage was "hot plugged" onto the CAN lines it is possible for large voltage overshoots to occur due to the inductance of the cabling.  In this case the 70-V rating may have been exceeded.  In these cases it is useful to monitor the voltage at the pins of the device on an oscilloscope during the testing to make sure the actual stress to the IC is well-understood.

    Regards,
    Max

  • 0 in reply to Miguel Robertson
    Prodigy 60 points

    Hi max,

    thanks for the quick reply.

    We conducted the test by applying the fault voltage on CANH and leaving CANL floating. I add that no resistor neither capacitor are on these signals so maybe some over/under shoots occurred.

    We'll make some additional tests as you described.

    Best regards, Maxime.