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TCAN1042V-Q1: TCAN1042V-Q1

Part Number: TCAN1042V-Q1
Other Parts Discussed in Thread: ISO1042, ESD2CAN24-Q1, ESD2CANFD24-Q1,

We are facing failure of IC TCAN1042 Due to High Energy on CAN H and CAN L Bus Lines.

Can we use Poly Switch in series to CAN H and CAN L Bus ? Will it Protect IC?

Will there be any Data Communication Errors if we use Poly Switch ?

K V M Rao

  • K V M,

    Using a PTC or fuse in series with CANH and CANL is theoretically possible, but it is not covered by the CAN standard as a use case. The risk in this condition is that when the fuse becomes open, it could disconnect the device from the bus or cause other communication interruptions. I would recommend testing your setup in a short-to-supply, short-to-battery, and/or short-to-GND test along with other system-level tests to ensure that these poly switches or PTC fuses do not present an issue to your system.

    Best,

    Danny

  • Dear Mr. Danny

    Thanks for your reply

    Can we use Poly switch in CAN circuit ?

    Are any other methods to take protect CAN H and CAN L lines from High Energy / High Voltage

    K V M Rao

  • K V M,

    By "PTC" I was generally referring to resettable fuses including poly switches, apologies for any confusion.

    Regarding your question about protecting the CAN lines, there are different answers depending on the type of concern that you have. If your system or environment poses a high risk of large electrostatic discharges, you could add ESD2CAN24-Q1 or ESD2CANFD24-Q1 as a protection device to your network. Alternatively, if you are concerned about large voltage offsets or other environmental conditions requiring isolation, you could consider ISO1042, which is an isolated CAN transceiver. Note that the ISO1042 has a different footprint option.

    Also, as an additional node: please consider TCAN1044AV-Q1 for your 8-pin CAN applications in place of the TCAN1042V-Q1. This is the newer component which should offer you better cost.

    Best,

    Danny