CAN Transceivers keep breaking upon connect/disconnect

Gideon Kanikevich

Part Number: TCAN334
Other Parts Discussed in Thread: TPD2E1B06, TPD1E10B09, TVS0701, TPD4E101, TCAN3413, ESD2CAN24-Q1

Tool/software:

I am trying to diagnose why our CAN transceivers keep breaking somewhat arbitrarily when the modules are connected/disconnected from the live system.

All our modules utilise the TCAN334DR CAN transceiver.

All modules have a ESD2CAN24DBZRQ1 located very close to the PCB CAN connectors.

According to the datasheet the clamping voltage is around 35-37V depending on Ipp:

It looks like the TCAN33x has an absolute maximum rating of +-14V on the bus lines:

Safe to say, I think I haven't picked the best CAN TVS for this transceiver, or am I missing something?

Is there a recommended TVS to use for this transceiver?

This is me presuming that the issue is being caused by transients on the bus when I connect/disconnect nodes from the bus, as this is the only time when the issue occurs.

Thanks in advance!

over 1 year ago

0 Sean Guo over 1 year ago

TI__Mastermind 28290 points

Hi Gideon,

Here is a good reference thread about ESD protection for 3.3V CAN, I agree that ESD2CAN-Q1 is not the ideal option for TCAN334 on transient surge protection.

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1066366/tcan332g-protection-for-surge-at-can-bus-lines/3946413#3946413

Do you need the same package as ESD2CAN24DBZRQ1? If not, some potential recommendations from TI's portfolio would be TPD1E10B09 Q1, TPD4E101, TPD2E1B06, TVS0701

Regards,

Sean

0 Gideon Kanikevich over 1 year ago in reply to Sean Guo

Prodigy 40 points

Hi Sean,

Thanks for the link and also the part recommendations.

We are doing a new board spin and I was considering changing to the newly discovered TCAN3413 due to its much larger bus fault voltage.

If I were to change to TCAN3413, is there a single package TVS you could recommend?

For the TCAN334, I was previously using the D5V0L2B3SO-7, which also lead to symptoms of the TCAN334 failures which is why I changed to the ESD2CAN-Q1. Perhaps there is something more sinister going on.

0 Sean Guo over 1 year ago in reply to Gideon Kanikevich

TI__Mastermind 28290 points

Hi Gideon,

I would expect ESD2CAN24-Q1 works well on TCAN3413, due to the ±58V fault protection just like most of TI's 5V CAN transceivers.

Regards,

Sean

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CAN Transceivers keep breaking upon connect/disconnect