TCAN1051GV-Q1: Bus fault protection voltage

Hello,

The bus fault tolerance is an absolute maximum voltage that the device can handle. We cannot guarantee that the device will preform regularly at this voltage. In fact, it most likely will not. But if you operate under that voltage then you won't do any permanent damage to the device. So in a 24V system if a fault occurred where CANH or CANL was shorted to +/- 24V the TCAN1051 has a bus fault tolerance +/- 58V so it would survive.

This is different than the common mode range of the device. The common mode input voltage is the voltage that the CANH and CANL pins can handle during normal operation. The reason this common mode range is so wide is to account for different ground potentials further along the can bus. Since these devices can sit at higher ground potentials than others it is important that our device can handle a wider range for normal operation.

So any voltage within the common mode range the CAN device can handle and will preform regularly. Any voltage outside the common mode range but within the bus fault tolerance the device won't preform regularly but no permanent damage will be done. Any voltage outside the bus fault tolerance can permanently damage the device.

Anything with a bus fault tolerance of +/- 45V is meant to handle a 12V system. Anything with a bus fault tolerance of +/- 58V is meant to handle a 24V system. Anything with a bus fault tolerance of +/- 70V is meant to handle a 48V system.

If this answered your question don't forget to hit the button. If you have any more questions let me know.

Best,

Chris